Air Release Valves Air/Vacuum Valves Combination ... - GA Industries

Air Release Valves 

Air/Vacuum Valves 

Combination Air Valves 

GA Air Valves are manufactured to meet or exceed AWWA Standard C512 

Made in the 

U.S.A. 

Bulletin AR-2000A 

COMBINATION AIR VALVES AIR/VACUUM VALVES 

AIR RELEASE VALVES

AIR RELEASE VALVES AIR/VACUUM VALVES 

COMBINATION AIR VALVES 

AIR RELEASE VALVES 

For Water • Wastewater • Industry 

GA Air Valves are manufactured to meet or exceed AWWA Standard C512-92 

AIR & VACUUM VALVES 

& Vacuum Relief Valves 






INDEX 

AIR RELEASE VALVES Pages 2-17 

The Function of “Air Release Valves” is to automatically exhaust 

small amounts of air which collect at system high points once the 

system is filled and up to pressure. The orifice size generally varies 

between 1/16” and 3/8” depending on valve design and working 

pressure, although we can provide orifice of 1”, or larger size for 

special needs. 

In Operation, as small quantities of air bubbles enter the valve, 

they will displace the liquid within the valve and lower its level in 

relation to the float. When the level of the liquid is lowered to where 

the float is no longer buoyant, the float will drop. This motion opens 

the valve seat and permits the air which has accumulated in the 

upper portions of the valve body to be exhausted to atmosphere. 

When this air is released the liquid level in the valve once again 

rises, lifts the float and closes the valve seat. This cycle automatically 

repeats as often as necessary. 

AIR/VACUUM VALVES Pages 18-37 

The Function of “Air/Vacuum Valves” is to automatically exhaust 

large volumes of air from the system when it is being filled and also 

to allow air to re-enter the pipe line when being emptied. The orifice 

size is generally the same size as the valve inlet and outlet. 

In Operation when the system is filled, the fluid lifts the float until 

it closes the orifice. The orifice will remain closed until the system is 

emptied. Air may enter the valve and displace the fluid while the 

system is in operation, however, internal pressure will continue to 

hold the valve closed. The valve will not re-open until the system 

pressure drops to near atmospheric pressure and the float is no 

longer buoyed. 

COMBINATION AIR VALVES Pages 38-61 

The Function of “Combination Air Valves” is to automatically 

exhaust large volumes of air from the system when it is being filled 

and to allow air to re-enter the pipe on line break or when the 

system is being drained. Plus, Combination Air Valves automatically 

expel small amounts of air which collect at system high points once 

the system is filled up to pressure and fluid is flowing. YOU MIGHT 

SAY THAT COMBINATION AIR VALVES DO IT ALL.



GA Air Valves are manufactured to meet or exceed AWWA Standard C512-92


Why Use Air Release Valves? 

Air that is entrained in a flowing liquid will naturally rise and 

tend to collect at high points within the system. This accumulation 

of air adds resistance to the liquid flow and can, under 

certain conditions, completely block the flow. However, the 

most common phenomenon is increased line resistance, 

requiring the pump to work harder, resulting in an increased 

energy consumption. Such a situation can continue unnoticed 

for a long time adding to the cost of operation. 

What Do They Do? 

Air Release Valves automatically exhaust these small amounts 

of air which collect at system high points, while the system is 

flowing and under pressure. This ensures the system will 

remain free of trapped air pockets, thereby increasing the efficiency 

and decreasing the overall operating cost of the system. 

How Do They Work? 

In operation, these valves are installed at high points in the 

system where air would naturally tend to collect. Air bubbles 

entering the valve will displace the liquid within the valve and 

lower the liquid level. When the level drops to where it no 

longer buoys the float, the float drops. This motion pulls the 

seat away from the orifice, opening the valve and allows the 

air that has accumulated in the upper portion of the valve to 

be exhausted to atmosphere. As the air is exhausted, liquid 

re-enters the valve, once again buoying the float, lifting it until 

the seat presses against the orifice, closing the valve. This 

cycle automatically repeats as often as necessary to maintain 

an air free system. 

Where Are They Used? 

Air Release Valves are installed on water transmission lines 

and sewage force mains, at or slightly downstream of peaks 

and high points, often as part of a “Combination Air Valve” 

(See Pages 38-61). 

Options & Accessories 

Flushing Attachment - Recommended with all sewage 

service air release valves, especially when used on 

raw sewage. Used to allow back-flushing of air release 

valve; includes isolating valves, quick-connect couplings 

and five feet of rubber hose. 

Vacuum Check - Used on outlet of air release valve to allow 

air to be vented from system but prevent re-entry of air 

when and if vacuum forms in the system. 

Isolating Valve - Supplied with air release valve to isolate 

valve from system for inspection or repair. Installed 

between valve and pipeline/system; 3” and smaller, ball 

valve is supplied, 4” and larger, butterfly valve is supplied. 

IMPORTANT NOTE: Air Release Valves cannot normally 

provide substantial vacuum protection when used alone. 

When vacuum protection is necessary, use in conjunction 

with adequate air/vacuum valves. 

AIR RELEASE VALVES... 

STANDARD CAPACITY 

Figure 901/902 

REFER TO PAGE 5 FOR DETAILS. 

Figure 905 

Figure 910/912 

Figure 901 Small Orifice Air 

Release Valves have a 1/16” 

diameter orifice standard and are 

suitable for use up to 150 psi 

working pressure. For operating 

pressures to 50 psi, an optional 

3/32” diameter orifice is available. 

Figure 902 is similar to the Figure 

901, but utilizes a larger float for 

operation to 300 psi with standard 

1/16” diameter orifice. Standard 

inlet connection is 1” NPT. 

Figure 905, “Mini-Matic” is a 

small, compact, economical air 

release valve, suitable for use up 

to 200 psi WOG working pressure, 

in its standard construction. 

It has a relatively large (3/32”) 

standard orifice (150 psi max 

W.P.) to minimize plugging and a 

Buna-N seat, rendering it suitable 

for both hot (up to 180 


o F) and 

cold water applications. The 905 

is available in 1/2” NPT or 3/4” 

NPT and can vent the trapped air 

from systems flowing up to 5,500 

GPM at a working pressure of 

150 PSI. 

Figure 912 Air Release Valve is 

slightly bigger than the 905 and 

has a larger standard orifice (1/8” 

dia.), to exhaust small pockets of 

air in systems flowing up to 9800 

GPM, at a working pressure of 

150 psig (300 psi, optional). The 

912 has a Buna-N seat (standard) 

and Viton is available as an 

option, with either 1/2”, 3/4” or 1” 

NPT inlet. Figure 910 is similar to 

the Figure 912 but has a 3/32” 

dia. orifice and is also available 

with 1/2”, 3/4” or 1” NPT inlet. 

REFER TO PAGE 7 FOR FIG. 910 DETAILS. 

REFER TO PAGE 8 FOR FIG. 912 DETAILS. 

Page 3 A Product of GA Industries

For Water, Wastewater and Raw Sewage 

HIGH CAPACITY SEWAGE SERVICE 

Figure 920 Figure 925 


Figure 922 


Figure 923 


Figure 920 Compound Lever 

Air Release Valve has a 3/16” 

standard orifice, is available 

with 1” or 2” NPT inlet connections 

(1-1/2” NPT optional) and 

can exhaust residual air from 

systems flowing up to 22,000 

GPM at 150 psi working pressure. 

Optional orifices for lower 

(75 psi) or higher (300 psi) 

working pressure are available. 

A Buna-N seat is standard, but 

Viton is optional. 

Figure 922 High Capacity Air 

Release Valves exhaust pockets 

of trapped air in high volume 

systems, or where excessive 

amounts of air are being 

introduced into the system. The 

large 3/8” orifice vents up to 235 

SCFM of air from systems 

flowing up to 88,000 GPM at a 

working pressure of 150 psi 

(standard). Standard inlet is 

either 2” or 3” NPT and optional 

orifices are available for higher 

(300 psi) or lower (75 psi) 

working pressure. 

Figure 923 Super High 

Capacity Air Release Valves 

are used on very large diameter 

pipelines and/or systems 

that trap huge amounts of 

air. Its super-large orifice (up 

to 1” in diameter) can 

exhaust up to 1669 SCFM 

UNDER PRESSURE, up to 

150 psi, 6” inlet size. 

Optional orifices for operating 

pressures to 300 psi are 

available. 


Figure 927 


Figure 929 


Figure 925 Standard Sewage Air 

Release Valves exhaust air and 

sewage gas from pressurized 

sewage systems (force mains). The 

tall body minimizes the possibility 

of sewage plugging the orifice or 

causing the mechanism to stick. 

Standard 3/16” orifice vents air/gas 

from sewage systems flowing up to 

8,800 GPM at a working pressure 

of 150 psi. For lower pressure 

systems, an optional 5/16” orifice 

will vent 50% faster at pressures 

to 75 psi. Standard inlet is 2” NP. 

Figure 927 High Capacity Sewage 

Air Release Valves are recommended 

on high flow sewage systems 

(up to 47,900 GPM), where 

excessive air is being entrained 

and trapped or on systems that 

give off extraordinary amounts of 

sewage gas. The large 7/16” orifice 

vents up to 320 SCFM of air 

or gas at a working pressure of 

150 psi. For lower pressure systems, 

optional 1/2” orifice vents 

almost 31% faster at pressures up 

to 75 psi. Standard inlet is 2” NPT; 

3” NPT and 4” FLG optional. 

Figure 929 Short Body Sewage 

Air Release Valves are recommended 

ONLY when the depth of 

the trench will not permit a standard 

air release valve to be used. 

The short body valve is only 12” 

tall (vs. 20-1/2” for standard 

valve), but otherwise has all the 

features of the standard valve. 

Note: High capacity valve cannot 

be supplied in short body. 

A Product of GA Industries Page 4 

AIR RELEASE VALVES


SMALL ORIFICE 

Air Release Valves 

AIR RELEASE VALVE 

FIG. 901/902 

GENERAL DIMENSIONS 

FIG.NO. INLET OUTLET A B WEIGHT 

(NPT) (DIAMETER) (SQUARE) (HEIGHT) (LBS.) 

901 1” 1/8” 5-3/8” 7-1/2” 23 

902 1” 1/8” 9” 11-3/8” 80 

ENGINEERING SPECIFICATION 

The Air Release Valve shall maintain closed position to 

prevent the loss of water by the positive seating of a noncorrosive 

float button against a smooth contact surface of 

the exhaust orifice. It shall automatically provide for the 

escape of air to atmosphere, without the loss of water, 

when the special ball float moves away from the orifice 

seat. The float shall be free floating within the valve body. 

Linkages of levers attached to the float are not acceptable. 

The body of the valve shall be of cast iron. 

The Air Release Valves shall be as manufactured by 

GA Industries, Inc., their Figure 901 (formerly Figure 

GH-4-150) or Figure 902 (formerly Figure GH-4-300). 

PARTS LIST 

1. BODY - Cast Iron A126 Class B 

2. COVER - Cast Iron A126 Class B 

3. ORIFICE - Delrin 

4. VENT PLUG - Delrin 

5. O-RING - Buna-N 

6. COVER BOLTS - Steel Grade 2 

7. COVER NUTS - Steel Grade 2 

8. FLOAT BALL - 316 Stainless Steel 

9. PATCH - Silicone Rubber 

ENGINEERING DATA 

Pressure Rating: 

Valve body rated 300 psi WOG, 

tested to 450 psi. 

Ball float tested to 1000 psi. 

FIG. 901/902 

Working Pressure: 

10-150 psi with 1/16” orifice (Standard-Fig. 901) 

10-150 psi with 3/32” orifice (Optional-Fig. 902-L) 


CONSULT FACTORY IF OPERATING 

PRESSURE IS LESS THAN 10 PSI. 

Maximum Venting Rate: 

Fig. 901 @ 150 psi with 1/16” orifice = 

6.5 SCFM 


12.5 SCFM 

Fig.902-L @ 150 psi with 3/32” orifice = 

14.7 SCFM 

FOR SIZING AND LOCATING SEE PAGES 

16-17. OTHER ORIFICES AVAILABLE; 

CONSULT FACTORY. 

Where to Install Air Valves: 

1. Peaks 

2. Increased Down Slope 

3. Decrease in Upward Slope 

4. Long Ascents 

5. Long Descents 

6. Long Horizontals 

7. Pumps 

8. Large Valves, Cylinders and Piping Loops 


MINI-MATIC 

Pressure Type Air Vent 

MINI-MATIC 

FIG. 905 


VALVE VALVE A B C WEIGHT 

(INLET) (OUTLET) (LENGTH) (HEIGHT) (WIDTH) (LBS.) 

1/2” NPT 

3/4” NPT 

1” NPT 

1/4” NPT 4” 5-1/8” 3-3/8” 5 


The Air Vent (Release) Valve shall be float operated and shall 

incorporate a simple lever mechanism to enable the valve to 

automatically release accumulated air from a fluid system while 

that system is pressurized and operating. 

The Air Vent Valve shall close drop tight, incorporating an 

easily renewable Buna-N seat, suitable for hot or cold steel. All 

internal metal parts shall be of stainless steel. The float shall be 

of stainless steel and be capable of withstanding a test pressure 

of 1000 PSIG. The linkage/lever mechanism shall be designed to 

prevent jamming. 

The body and cover shall be of cast iron conforming to 

ASTM A126 Class B, and shall be designed to withstand a test 

pressure of 300 PSIG. 

The Air Vent (Release) Valves shall be as manufactured by 

GA Industries, Inc., their Figure 905 Minimatic. 

PARTS LIST 





Float tested to 1000 psi. 


10-150 psi with 3/32” orifice 

(Standard-Fig. 905) 


(Optional-Fig. 905-H) 



FIG. 905 



3. GASKET - Composition 

4. ORIFICE - 316 Stainless Steel 

5. FLOAT ARM - 316 Stainless Steel 

6. LEVERAGE BRACKET - 316 Stainless Steel 

7. ORIFICE BUTTON - Buna-N 

8. SPRING PIN - 410/420 Stainless Steel 


10. CAP SCREW - 18-8 Stainless Steel 

11. LOCKWASHER - 18-8 Stainless Steel 

12. PIPE PLUG 1/2” NPT - Steel (Commercial) 


14. COILED SPRING PIN - 302 Stainless Steel 

15. BUSHING - Steel (Commercial) 




14.7 SCFM 

Fig. 905-H @ 200 psi with 1/16” orifice = 

8.5 SCFM 





1. Peaks 






7. Pumps 



AIR RELEASE VALVES


SIMPLE LEVER 

Pressure Type Air Release Valve 

SIMPLE LEVER AIR RELEASE 

FIG. 910 


VALVE VALVE A B WEIGHT 

(INLET) (OUTLET) (DIAMETER) (HEIGHT) (LBS.) 

1/2” NPT 

3/4” NPT 

1” NPT 

3/8” NPT 5-1/8” 6-1/4” 8 


15 

When 

Required 

The Air Release Valve shall be float operated and shall 




The Air Release Valve shall close drop tight, incorporating an 

easily renewable Buna-N seat for superior service on water. All 

internal metal parts shall be of stainless steel. The float shall be 

of stainless steel and be capable of withstanding a test pressure 

of 1000 PSIG. The linkage/lever mechanism shall be designed 

to prevent jamming. 


ASTM A126 Class B, and shall be designed to withstand a 

test pressure of 450 PSIG. 


GA Industries, Inc., their Figure 910 (formerly Figure 1/2-AR, 

3/4-AR and 1 AR). 

PARTS LIST 













FIG. 910 








8. BRACKET SCREW - 18-8 Stainless Steel 




12. FLOAT SCREW - 18-8 Stainless Steel 


14. PIPE PLUG - Steel (Commercial) 

15. REDUCING BUSHING - Steel (Commercial) 



14.7 SCFM 


12.5 SCFM 





1. Peaks 






7. Pumps 



SIMPLE LEVER 

Pressure Type Air Release 

Valve FIG. 912 

SIMPLE LEVER AIR RELEASE 

FIG. 912 



(INLET) (OUTLET) (DIAMETER) (HEIGHT) (LBS.) 

1/2” NPT 

3/4” NPT 

1” NPT 

3/8” NPT 5-1/8” 6-1/4” 8 






The Air Release Valve shall close drop tight, incorporating a 

renewable Buna-N seat for superior service on water. All internal 

metal parts shall be of stainless steel, withstanding a test pressure 

of 1000 PSIG. The linkage/lever mechanism shall be 

designed to prevent jamming. 





GA Industries, Inc., their Figure 912. 

PARTS LIST 








8. BRACKET SCREW - 316 Stainless Steel 




12. PIVOT LINK - 316 Stainless Steel 



















26.1 SCFM 


28 SCFM 





1. Peaks 






7. Pumps 



AIR RELEASE VALVES


COMPOUND LEVER 


COMPOUND LEVER AIR RELEASE 

FIG. 920 



(INLET) (OUTLET) (SQUARE) (HEIGHT) (LBS.) 

1” NPT 

1-1/2” NPT 

2” NPT 

1/2” NPT 6-3/8” 9-7/8” 24 



incorporate a compound lever mechanism to enable the valve to 




adjustable Buna-N orifice button. All internal metal parts shall be 

of stainless steel. The float shall be of stainless steel and be 

capable of withstanding a test pressure of 1000 PSIG. The linkage/lever 

mechanism shall be able to be removed from the valve 

without disassembly of the mechanism, and shall be designed to 

prevent jamming. 





GA Industries, Inc., their Figure 920 (formerly Figure 1-AR, 

A 1/2-AR and 2-AR). 

PARTS LIST 













FIG. 920 




4. BRACKET SCREW - 18-8 Stainless Steel 

5. LEVER ARM - 316 Stainless Steel 


7. ORIFICE BUTTON - Buna-N/18-8 Stainless Steel 

8. HEX NUT - 18-8 Stainless Steel 



11. VALVE LINK (Air Release) - 316 Stainless Steel 


13. FLOAT CAP SCREW - 18-8 Stainless Steel 

14. BRACKET LOCKWASHER - 18-8 Stainless Steel 





19. PIPE PLUG 1” NPT - Malleable Iron 





58.7 SCFM 


49.8 SCFM 





1. Peaks 






7. Pumps 



HIGH CAPACITY 

COMPOUND LEVER 

Pressure Type Air Release Valve FIG. 922 

HI-CAPACITY AIR RELEASE PARTS LIST 


FIG. 922 



2” NPT 

3” NPT 

1/2” NPT 6-3/8” 12” 40 








capable of withstanding a test pressure of 1000 PSIG. The 

linkage/lever mechanism shall be able to be removed from the 

valve without disassembly of the mechanism, and shall be 






GA Industries, Inc., their Figure 922 (formerly Figure 2-LAR 

and 3-LAR). 





5. BRACKET CAP SCREWS - 18-8 Stainless Steel 

6. BRACKET LOCKWASHERS - 18-8 Stainless Steel 

7. ORIFICE BUTTON - 18-8 Stainless Steel 




11. LEVERAGE ARM - 316 Stainless Steel 


13. COILSPRING PIN - 302 Stainless Steel 






19. PIPE PLUG 2” NPT - Cast Iron 

















234.8 SCFM 


152.6 SCFM 





1. Peaks 






7. Pumps 



AIR RELEASE VALVES


SUPER HIGH CAPACITY 


HI-CAPACITY AIR RELEASE PARTS LIST 

FIG. 923 4” SIZE 6” SIZE 


VALVE VALVE A B C WEIGHT 

(INLET) (OUTLET) (LENGTH) (HEIGHT) (WIDTH) (LBS.) 

4” FLG.* 1” NPT 8-1/2” 22-1/2” 6-3/8” 100 

*Also available with 2” or 3” NPT Inlet 

6” FLG. 1” NPT 15” 29-1/2” 13-1/2” 320 







adjustable Buna-N orifice button. All internal metal parts shall be of 

stainless steel. The float shall be of stainless steel. The 

linkage/lever mechanism shall be able to be removed from the 

valve without disassembly of the mechanism, and shall be 








FIG. 923 





5. BRACKET CAP SCREWS - 18-8 Stainless Steel 

6. BRACKET LOCKWASHERS - 18-8 Stainless Steel 




10. COILED SPRING PINS - 302 Stainless Steel 



13. LINKAGE FLOAT ARM - 316 Stainless Steel 




17. UNIVERSAL COUPLING - 316 Stainless Steel 

18. BALL FLOAT ARM - 316 Stainless Steel 




22. CONNECTOR - 18-8 Stainless Steel 



25. HEX HEAD CAP SCREW - 18-8 Stainless Steel 

26. FLOAT HOOD - 316 Stainless Steel 

27. CLOSE NIPPLE - Steel SCH. 80 

28. COMPANION FLANGE - Cast Iron 


CL.125 Flanged Inlet = 200 PSIG WOG (300 psi test) 

CL.250 Flanged Inlet = 400 PSIG WOG (600 psi test) 



4” - 10 to 150 psi with 1/2” orifice (Standard-Fig. 923) 

10 to 300 psi with 3/8” orifice (Optional-Fig. 923-H) 

6” - 10 to 150 psi with 1” orifice (Standard-Fig. 923) 

10 to 300 psi with 11/16” orifice (Optional-Fig. 923-H) 




Fig. 923 

4” @ 150 psi with 1/2” orifice = 417.3 SCFM 

6” @ 150 psi with 1” orifice = 1669.4 SCFM 

Fig. 922-H 



FOR SIZING AND LOCATING SEE PAGES 16-17. 

OTHER ORIFICES AVAILABLE; CONSULT FACTORY. 

Inlet Connection: 

ANSI B16.1 CL.125 (Standard) 

ANSI B16.1 CL.250 (Optional) 


1. Peaks 






7. Pumps 



STANDARD 

Sewage Air Release Valve 

SEWAGE AIR RELEASE PARTS LIST 




2” NPT 

3” NPT 1/2” NPT 

6-3/8” 20-1/2” 60 

4” FLG 6-3/8” 22-1/2” 80 


The Sewage Air Release Valve shall be float operated and shall 


automatically release accumulated air and gases from a sewage 

pipeline while the system is pressurized and operating. 



stainless steel. The linkage/lever mechanism shall be able to be 

removed from the valve without disassembly of the mechanism. The 

float shall be of stainless steel and be capable of withstanding a 1000 

PSIG test pressure. 

The body and cover shall be of cast iron conforming to ASTM 

A126 Class B. Inlet connection shall be 2” or 3” NPT, or 4” FLG, as 

required. Outlet connection shall be 1/2” NPT. 

When specified, the valve shall be supplied with a “Flushing 

Attachment” consisting of: bronze shut-off valves, quick-connect 

couplings and rubber hose, for back washing with clear water. 

The Sewage Air Release Valves shall be as manufactured by GA 

Industries, Inc., their Figure 925 (formerly Figure SAR-3 or SAR-5). 






FIG. 925 





5. LEVERAGE BRACKET SCREWS - 

18-8 Stainless Steel 

6. LEVERAGE BRACKET LOCKWASHER - 













18. FLOAT ROD - 316 Stainless Steel 










Fig. 925-L @ 75 psi with 5/16” orifice = 

88.8 SCFM 


58.7 SCFM 





1. Peaks 






7. Pumps 



AIR RELEASE VALVES


HIGH CAPACITY 



FIG. 927 


(Flushing 

Attachments 

Not Shown) 



2” NPT 

3” NPT 1” NPT 

6-3/8” 22-1/2” 61 

4” FLG 6-3/8” 24-1/2” 81 


The “High Capacity” Sewage Air Release Valve shall be float 

operated and shall employ a compound lever mechanism to enable 

the valve to automatically release accumulated air and gases from 

a sewage pipeline while the system is pressurized and operating. 



stainless steel. The linkage/lever mechanism shall be able to be 

removed from the valve without disassembly of the mechanism. 


A126 Class B. Inlet connection shall be 2” or 3” NPT, or 4” FLG, 

as required. Outlet connection shall be 1” NPT. 




The “High Capacity” Sewage Air Release Valve shall be as 

manufactured by GA Industries, Inc., their Figure 927 (formerly 

Figure SAR-7 or SAR-8). 






FIG. 927 





5. LEVERAGE BRACKET SCREWS - 


6. LEVERAGE BRACKET LOCKWASHER - 




8A. HEX NUT - 18-8 Stainless Steel 















23. FLOAT HOOD BOLT - 18-8 Stainless Steel 

24. CONNECTOR - 18-8 Stainless Steel 









227.3 SCFM 


319.5 SCFM 





1. Peaks 






7. Pumps 



SHORT BODY 



FIG. 929 


(Flushing 

Attachments 

Not Shown) 



2” NPT 

3” NPT 1/2” NPT 

6-3/8” 12” 40 

4” FLG 6-3/8” 14” 60 


The “Short Body” Sewage Air Release Valve shall be float 

operated and shall employ a compound lever mechanism to enable 

the valve to automatically release accumulated air and gases from 

a sewage pipeline while the system is pressurized and operating. 



of stainless steel. The linkage/lever mechanism shall be able to 

be removed from the valve without disassembly of the mechanism. 

The float shall be stainless steel and be capable of withstanding 

a 1000 PSIG test pressure. 


A126 Class B. Inlet connection shall be 2” or 3” NPT, or 4” FLG, 

as required. Outlet connection shall be 1/2” NPT. Maximum height 

(without attachments) shall be 12” (2” and 3” size), 14” (4” size). 




The “Short Body” Sewage Air Release Valve shall be as 

manufactured by GA Industries, Inc., their Figure 929 (formerly 

Figure SARS-3 or SARS-5). 






FIG. 929 



3. LEVERAGE BRACKET - 

316 Stainless Steel 


5. BRACKET SCREWS - 18-8 Stainless Steel 

6. BRACKET LOCKWASHER - 


7. ORIFICE BUTTON - Buna-N/18-8 

Stainless Steel 







14. VALVE LINK (Air Release) - 
















88.8 SCFM 


58.7 SCFM 





1. Peaks 






7. Pumps 



AIR RELEASE VALVES


VACUUM CHECK 

Air Release Valves will open and admit 

small amounts of air into the pipeline 

when a vacuum condition exists. If this is 

undesirable, specify a vacuum check on 

the valve outlet. The resilient seated 

bronze vacuum check allows air to be 

discharged but will close and prohibit 

re-entry on vacuum. Primarily used on 

hot/cold water lines or where the air 

release is installed above the hydraulic 

gradient. Available in sizes 1/4” NPT to 

2” NPT. 

(When required, specify “V” at end 

of Model/Figure Number.) 

OPTIONAL MATERIALS 

Body and Cover 

Cast Ductile Iron - ASTM A536 

Cast Steel - ASTM A216, GR WCB 

Cast Stainless Steel - ASTM A743 

COATINGS 

Standard coating consists of a heavy 

coast of red Phenolic primer on external 

surfaces. 

Optional 

AWWA C550 Fusion-Bonded Epoxy 

Asphalt Varnish 

2-Part Epoxy 

KF Polymer ® /Kynar ® (PVDF) 

IF OPTIONAL MATERIALS OR 

COATINGS ARE REQUIRED, 


OPTIONS & ACCESSORIES 

ISOLATING VALVE 

Air Valves always should be installed with an isolating valve 

between the air valve and the line, to allow the valve to be serviced 

or replaced without shutting down the line. For sizes up to 3” NPT, a 

Figure 20 Bronze Ball Valve will be furnished and for sizes 4” and up 

with a flanged connection, a Figure 30 Lugged Butterfly Valve will be 

supplied as an isolating valve. 

(When required, specify "I" at end of Model/Figure Number.) 

BACKFLUSH ATTACHMENTS 

VALVE DIMENSIONS WITH BACKFLUSH ATTACHMENTS 

Figure 925 

STANDARD 

Sewage Service Air Release shall 

be fitted with a “Backflush 

Attachment” to allow periodic 

flushing of sediment, grease and 

solids. Backflush Attachment shall 

consist of bronze Ball Valve (up to 

3”) or lugged type butterfly valve 

(4” and up) to isolate the air valve 

from the line, bronze blow off 

valve(s), bronze flush valve(s) and 

a minimum of 5 ft. of rubber hose 

with quick disconnects. 

(When required, specify “F” at 

end of Model/Figure Number.) 

Figure 927 

HIGH CAPACITY 

Figure 929 

SHORT BODY 

SIZE HEIGHT WEIGHT HEIGHT WEIGHT HEIGHT WEIGHT 

2” 

NPT 

26-1/4” 72 lbs. 28-1/4” 73 lbs. 17-3/4” 57 lbs. 

3” 

NPT 

26-1/4” 80 lbs. 28-1/4” 81 lbs. 17-3/4” 65 lbs. 

4” 

NPT 

24-1/2” 100 lbs. 26-1/2” 101 lbs. 16” 85 lbs. 


AIR RELEASE VALVE SELECTION & SIZING 

METHOD 1: IF A SPECIFIC VENTING CAPACITY IS REQUIRED: 

A. USING TABLE 1 

If the “Specific Venting Rate” is known, refer to Table 1 and select the Air Release Valve which has an orifice available 

whose venting rate is at least equal to the required rate at the maximum working pressure the valve will be operating. 

Select Standard orifices whenever possible. On a long pipeline, it is better to install Air Release Valves with smaller 

orifices at frequent intervals than to install a few valves with large orifices. 

WORKING PRESSURE, PSIG 

5 

10 

15 

25 

50 

75 

100 

125 

150 

200 

250 

300 

TABLE 1 - Venting Rate, Standard Cubic Feet Per Minute (SCFM) - @Cd = 0.7 

AIR RELEASE VALVE ORIFICE DIAMETER, IN. 

1/16 3/32 1/8 3/16 7/32 5/16 3/8 7/16 1/2 11/16 1 

0.7 1.5 2.7 6.2 8.4 17.2 24.7 33.6 43.9 83.0 175.6 

1.0 2.2 3.9 8.7 11.9 24.3 34.9 47.5 62.1 117.4 248.4 

1.2 2.6 4.7 10.6 14.4 29.4 42.3 57.6 75.2 142.2 300.8 

1.6 3.5 6.3 14.1 19.3 39.3 56.6 77.0 100.6 190.2 402.3 

2.6 5.8 10.3 23.1 31.4 64.0 92.2 125.5 163.9 309.9 655.7 

3.6 8.0 14.2 32.0 43.5 88.8 127.8 174.0 227.3 429.7 909.1 

4.5 10.2 18.2 40.9 55.6 113.5 163.5 222.5 290.6 549.5 1162.5 

5.5 12.4 22.1 49.8 67.8 138.3 199.1 271.0 354.0 669.3 1415.9 

6.5 14.7 26.1 58.7 79.9 163.0 234.8 319.5 417.3 789.0 1669.4 

8.5 19.1 34.0 104.1 306.0 1028.6 

10.5 23.6 41.9 128.4 377.3 1268.1 

12.5 28.0 49.8 152.6 448.6 1507.7 

905-H 905 910-L 920 922-H 920-L 922 927 923(4”) 923-H(6”) 923(6”) 

910-H 910 912 925 925-L 923-H(4”) 922-L 

901 912-H 920-H 929 929-L 927-L 

902 902-L 

ORIFICE AVAILABILITY 

B. USING GRAPH 1 

1. Enter system pressure and venting capacity 

onto Graph 1 and select nearest larger 

orifice diameter. 

2. Consult available Air Release Valve orifice 

diameters on Table 1 and select Valve with 

correct orifice diameter and pressure rating. 

SELECT A STANDARD ORIFICE 

WHENEVER POSSIBLE. 

3. It is more efficient to install a greater 

quantity of air release valves at strategic 

locations with smaller orifice than a lesser 

quantity with larger orifice. 

USEFUL INFORMATION 

1 ft. 3 /min. = 7.48 gal./min 

1 gal./min. = .134 ft. 3 /min. 

1 inch = 25.4 millimeters 

1 kPA = 0.145 PSIG 

1 SCFM = 0.0283 m3/min. 

1 gal./min. = 0.0631 l/sec. = 0.2272m3 /hr. 

GPM 

x 2%* = Required Venting Rate in SCFM. 

7.48 

*2% Multiplier used for clean water systems only. 

5% Multiplier used for sewage systems. 

BOLDFACE Indicates Orifice Is Standard on that Figure No. 

OPERATING PRESSURE (PSIG) 

GRAPH 1 - Small Orifice Venting Capacities 

ORIFICE DIAMETER 

STANDARD CUBIC FEET PER MINUTE (SCFM) AIR 


AIR RELEASE VALVES


II. METHOD 2: 

Air Release Valve Selection & Sizing 

A. USING TABLE 2 

If the specific venting rate is not known, Table 2 will assist in the selection of the correct type and proper size Air Release Valve. Determine the 

system maximum liquid flow rate (GPM) and maximum working pressure (PSIG). Select the orifice size and corresponding Air Release Valve Figure 

Number from the chart, noting the service on which the valves will function. Select a standard orifice size whenever possible. Long pipelines are vented 

more efficiently by Air Release Valves at frequent intervals than by larger orifice Air Release Valves widely spaced. 

TABLE 2 (Air Release Valve Quick Selection Guide) 

SERVICE 

CLEAN FLUIDS 

STANDARD CAPACITY HIGH CAPACITY 

SEWAGE SERVICE 

STD.CAP. HIGH CAP. SHORT BDY. 

FIGURE NUMBER 901 905 902 910 912 920 922 923(4”) 923(6”) 925 927 929 

INLET 

SIZES AVAILABLE 

1” 1/2”, 3/4” 1” 1/2”, 3/4”, 1” 1/2”, 3/4”, 1” 1”, 1-1/2”, 2” 2”, 3” 4” 6” 2”, 3”, 4” 2”, 3”, 4” 2”, 3”, 4” 

WORKING 

0-75 0-75 0-75 0-75 0-75 0-75 

PRESSURE 0-150 0-150 0-150 0-150 0-150 0-150 0-150 0-150 0-150 0-150 0-150 0-150 

(PSIG)* 

0-200 0-300 0-300 0-300 0-300 0-300 0-300 0-300 

ORIFICE SIZE 

(IN) 

SYSTEM MAXIMUM 

FLOW RATE 

(GPM)** 

MAXIMUM 

VENTING CAPACITY 

(SCFM)** 

1/8” 5/16” 1/2” 5/16” 1/2” 5/16” 

1/16” 3/32” 3/32” 3/32” 1/8” 3/16” 3/8” 1/2” 1” 3/16” 7/16” 3/16” 

1/16” 1/16” 1/16” 3/32” 1/8” 7/32” 3/8” 11/16” 

5,300 33,300 85,200 13,300 34,100 13,300 

2,400 5,500 5,500 5,500 9,800 22,000 88,000 156,500 626,000 8,800 47,900 8,800 

3,100 4,700 4,700 10,500 18,700 57,200 168,000 565,000 

14.2 89 227.3 88.8 227.3 88.8 

6.5 14.7 14.7 14.7 26.1 59 234.8 417.3 1669.4 58.7 319.5 58.7 

8.5 12.5 12.5 28 50 152.6 448.6 1507.7 

BOLDFACE INDICATES STANDARD CONSTRUCTION. WORKING PRESSURE, ORIFICE SIZE, FLOW RATE & VENTING CAPACITY CORRESPOND 

FOR THE OTHER FIGURE NUMBERS AS INDICATED FOR THE FIG.929. *Specify if working pressure is below 10 PSI. **At maximum working pressure. 

B. USING GRAPH 2 (For clean water systems only) 

Where valve is to be selected on the basis of maximum system flow. 

(This graph assumes that clean water at standard conditions contains 2% 

dissolved air by volume and therefore will select an orifice diameter that will 

exhaust approximately 2% of the volume.) 

1. Enter total maximum system flow at the bottom of Graph 2, draw a 

vertical line upward until you reach the line indicating maximum 

pressure. Draw a line horizontal left until you read minimum 

required orifice diameter. 

2. Consult available Air Release Valve orifice diameter on Table 2 and 

select Valve with correct orifice diameter and pressure rating. SELECT 

A STANDARD ORIFICE WHENEVER POSSIBLE. 

3. It is more efficient to install a greater quantity of Air Release Valves at 

strategic locations with smaller orifice than a lesser quantity with larger 

orifice. 

NOTE: Air Release Valves are commonly installed as a “Combination Air 

Valve,” (See Pages 38-61). Sizing and selection is the same as above when 

used in Combination Air Valves. 

PIPELINE PRESSURE, PSIG 

PIPELINE FLOW IN U.S. GALLONS PER MINUTE 

HYDRAULIC GRADIENT 

WHEN EMPTYING OR 

FLUSHING LINE 

AT LEAST TWO 

AIR VALVES 

WHERE TO INSTALL AIR VALVES 

HYDRAULIC GRADIENT 

LONG ASCENDING STRETCH 

WITHOUT SUMMIT LONG DESCENDING STRETCH 

WITHOUT SUMMIT LONG HORIZONTAL STRETCH 

WITHOUT SUMMIT 

PARALLEL TO 

HYD. GRADIENT 

CHANGE IN 

UPWARD SLOPE 

DOWNWARD GRADE APPROACHING THE 

DATUM LINE 

HYD. GRAD. AIR VALVE AT PEAK 

AIR VALVE AT CHANGE IN DOWNWARD SLOPE. VACUUM LIKELY WHEN EMPTYING LINE. 

1. Peaks - Install Combination Air Valves. This is the foremost place where air valves 4. Long Ascents - Install Air/Vacuum Valves @ 1/4 - 1/2 mile intervals. 

are required. A peak is located by reference to the hydraulic gradient and not to a 5. Long Descents - Install Combination Air Valves @ 1/4 - 1/2 mile intervals. 

horizontal datum line. A section of the pipeline that is above the hydraulic gradient 6. Long Horizontals - Install Combination Air Valves @ 1/4 - 1/2 mile intervals. 

is under negative pressure and generally requires the use of a check to prevent air 7. Pumps - Install Air Release on discharge as close as possible to check valve. 

from being drawn into the pipeline. 

8. Large Valve, Operating Cylinders & Piping Loops - Install Air Release Valves 

2. Increased Down Slope - Install an Air Release Valve. If vacuum protection is 

required, install a Combination Air Valve. 

3. Decrease in Upward Slope - Same as 2 

NOTE: At points near the hydraulic gradient a negative pressure condition can occur after 

a pump trip or valve closure. Consider the use of a Surge Check or Vacuum Breaker/Air 

Release Valve. See pages 21, 26-28, 34, 40, 52, 53, 59 and 60 for further information. 

Page 17 A Product of GA Industries 

SMALL ORIFICE DIA. (INCHES)

AIR & VACUUM VALVES 

& Vacuum Relief Valves 



AIR/VACUUM VALVES 

WHY USE AUTOMATIC AIR/VACUUM VALVES? 

Filling and draining are two critical times in the operation of a 

pipeline. During filling, air which occupies the empty pipeline 

must be evacuated ahead of the incoming liquid, in a controlled 

and efficient manner, so that surge and waterhammer 

are minimized and liquid completely fills the pipeline with no 

trapped air. During draining, whether planned or unexpected, 

air must be admitted into the system to replace the outflowing 

liquid to prevent vacuum formation. 


Air/Vacuum Valves allow the air that is being pushed ahead 

of the incoming liquid to escape from the system and insure 

a complete filling of the pipeline. Once the pipeline is purged 

of air, the valve closes tight and does not open until the system 

is drained or a negative pressure occurs. It then opens, 

admitting large volumes of air into the pipeline to eliminate a 

vacuum condition. 

Where Are Air/Vacuum Valves Used? 

The primary application for Air/Vacuum Valves is on water 

transmission lines and sewage force mains. Often, they are 

installed along with Air Release Valves (See Pages 2-17) or 

as Combination Air Valves (See Pages 38-61) to not only 

function during filling/draining but also to vent air pockets 

during operation. Air/Vacuum Valves are frequently installed 

KINETIC Air/Vacuum Valve 

The Engineerʼs Choice When Dependability, Efficiency and Versatility Are Required! 

Figure 930 

Typical Screwed Inlet, 

Screwed Outlet 

STANDARD FEATURES: 

Protective hood on outlet (6” and larger) 

at no extra charge. NPT OUTLET STANDARD 

4” AND SMALLER. 

FULL SIZE OUTLET for maximum air inflow and 

exhausting capacity. 

Unique one piece seat, seals drop tight as low as 

10 PSI or as high as 300 PSI. No need to stock 

different seats for pressures above or below 150 PSI. 

Full length guides insure proper seating even if 

valve is not perfectly vertical. 

Spherical, stainless steel float in all sizes for strongest 

possible shape, tested to 1000 PSI. Round float provides 

“line contact” sealing at low pressure. The float 

is the only moving part. 

Rubber cushions protect float from damage during 

sudden vacuum, standard all sizes. 

The KINETIC Air/Vacuum Valve (see page 61) 

ensures complete purging of all air prior to valve closure. 

This KINETIC design prevents premature valve 

closure while exhausting air to sonic velocity. 

NPT inlet standard 1/2”-3”, 125 FLG standard 4”-16”, 

optional to 2” & 3”. Other flanges, pressure ratings 

available. 

on the discharge side of Deep Well Turbine Pumps, 

between the pump and discharge check valve, to exhaust 

large volumes of air from the system each time the pump 

starts and to break the vacuum when the pump stops. 


In operation, Air/Vacuum Valves are installed at points in 

the system where air would naturally tend to rise during 

the filling and where a vacuum would tend to form upon 

draining. The valve is normally open and exposes a full 

size orifice. Since the rate of air discharge is a function of 

the pressure across the valve orifice, incoming liquid compresses 

the air until sufficient pressure develops to give 

the escaping air an exhaust rate equal to that of the liquid. 

Once all the air has been purged, liquid lifts the float 

ball, closing the orifice. Residual air pockets may enter 

the valve while the system is in operation, but the float will 

be held closed against the seat by the internal pressure. 

As soon as the internal pressure drops to near atmosphere 

(impending vacuum) the float drops and opens the 

valve, permitting an inflow of air to the system. Thus, a 

critical vacuum cannot form and the system is protected 

from damage. 

Figure 930 

Typical Flanged Inlet, 

Protective Cowl on Outlet 


WHY USE KINETIC AIR/VACUUM VALVES? 

1. The KINETIC Air/Vacuum Valve is designed to prevent the valve from being blown shut should the float ball 

become caught in the high velocity exhausting air stream. Should this happen, the purpose of the valve has 

been defeated since the orifice is then shut, but all the air has not yet been purged. Efforts to minimize this 

phenomenon by conventional type Air/Vacuum Valve manufacturers only serve to complicate the valve design. 

The GA KINETIC Air/Vacuum Valve is designed not to be blown shut by the air stream, regardless of pressure, 

at exit velocities approaching sonic velocity. 

2. KINETIC Valves use hydrodynamic 

principles, evolved from 

Bernoulliʼs theory, to produce a 

valve that is actually held open 

by the exiting air stream, but is 

immediately closed when solid 

water rises in the valve and lifts 

the float ball, sealing the orifice. 

Conventional design valves usually 

have cages or pockets, sheltered 

from the escaping air, for the ball 

to drop into when the valve is open. 

Experience has shown that the turbulence 

created in the conventional 

valve body can cause the float to 

nevertheless be “sucked up” by the 

air stream and close the valve. 

Since only the slight pressure 

olds the ball on the seat, it will 

not re-open until the pressure is 

released during draining. 

3. The theory behind the KINETIC 

Valve can be shown by experiment. 

By placing an ordinary table-tennis 

ball in a small funnel and blowing 

air through the stem, the ball will 

not be thrown from the funnel but 

will be held there by the aerodynamic 

force created by the air 

IMPORTANT NOTE TO ENGINEERS: 

KINETIC 

CONVENTIONAL 

stream moving over the ball. The 

greater the air stream velocity, 

the stronger the aerodynamic force, 

sufficient to defy gravity and hold 

the table-tennis ball in the funnel 

even when inverted. 

4. The design of the KINETIC 

Air/Vacuum Valve incorporates 

a specific ball diameter for a 

given valve size such that the 

aerodynamic force will hold the 

ball in the open position as air is 

moving across it but will be 

buoyed by the hydraulic action of 

rising water. This coupled with a 

proper angle of the cone at the 

valve's inlet provides an Air/ 

Vacuum Valve that is designed 

not to be blown shut regardless 

of pressure, at exit velocities 

approaching sonic velocity. 

5. Only KINETIC Air/Vacuum 

Valves can be confidently installed 

on systems where air is likely to 

be discharged at high velocity, 

such as on deep-well pumps. 

Oversizing Air/Vacuum Valves to limit the exhausting pressure causes the system to fill too fast at virtually 

no pressure and can result in severe surge, slam and damage. KINETIC Air/Vacuum Valves let the engineer 

select the proper size air valve whose orifice will create sufficient back pressure during the filling operation to 

slow the incoming water, minimizing slam and surge, without the possibility of sudden, premature closure. 

Select the size KINETIC Air/Vacuum Valve for efficient purging of air during filling and if conditions require 

additional inflow capacity during draining, supplement the Air/Vacuum Valve with Vacuum Relief Valves 

(Figure 990, see page 32). 


AIR/VACUUM VALVES


ADDITIONAL KINETIC AIR/VACUUM VALVES 

KINETIC “SLOW CLOSING” AIR/VACUUM VALVE WITH SURGE CHECK 

This valve is especially designed to minimize the shock that may 

occur in applications where operating conditions would cause a 

regular Air/Vacuum Valve to slam open and closed. In particular, 

Air/Vacuum Valve installations at high points where the hydraulic 

gradient and flow conditions are such that a negative pressure is 

possible, where the line velocity is (or could be) 10 F.P.S. or greater 

are vulnerable to shock damage. The “Slow Closing” feature serves 

two purposes: 

1. To minimize the system shock and surge by slowing 

the closing speed of the air valve. 

2. To protect the air valve itself from damage due to rapid 

closure caused by the water column. 

The “Slow Closing” Air/Vacuum Valve is actually a standard 

KINETIC Air/Vacuum Valve mounted on top of a special “Surge 

Check” Valve that has holes drilled through its disc. (For optional 

bypass piping, add a “7” to the figure number.) The check valve 

and air valve are normally open allowing for free discharge of air, 

but when water enters the valve, its energy is sufficient to lift the 

Figure 931 

FLG Inlet, 

Hood on Outlet 

For use outside, or 

where noise of 

discharging air is 

acceptable. 

Figure 933 

Typical Screwed Inlet 

For use with small deep 

well or turbine pumps. 

disc and reduce the flow of water to that which can pass through 

the holes (or optional bypass piping). The air valve is gently floated 

shut. Pressure then equalizes across the check valve disc and it 

re-opens, but the air valve remains closed, held shut by the system 

pressure. When the pressure drops to near atmospheric (impending 

vacuum), the float drops and air is admitted into the system to 

prevent critical vacuum from occurring. 

These valves are used on high velocity water transmission lines, 

on high volume deep well turbine pumps or wherever abnormal 

conditions (line rupture, power outage, etc.) could generate surge 

velocities in excess of 10 F.P.S. 

For more information on “Slow Closing” Air Valves, see pages 26-28 and 52-53. 

Figure 931 

FLG Inlet, 

NPT or FLG Outlet 

For use on deepwell 

pumps inside pump 

house, or where outlet 

is to be piped away. 

KINETIC AIR/VACUUM VALVE FOR DEEP WELL TURBINE PUMPS 

This application is ideally suited to the KINETIC design Air/Vacuum Valve. Installed between the 

pump and the discharge check valve, the KINETIC Air/Vacuum Valve serves these purposes: 

1. Purge air from system at start-up, prior to check valve opening. 

2. To exhaust the air at a pressure which slows the ascent of the water column during start-up. 

3. To break the vacuum when the pump shuts down, the check valve closes and 

water drains into the well. 

The rate of air discharge is a function of the pressure across the valve's orifice. Sizing the 

Air/Vacuum Valve to create a filling pressure higher than the "no head" condition stipulated by conventional 

Air/Vacuum Valves (to prevent "blowing shut") can provide a more efficient filling operation, 

slow the ascending water column and minimize the shock, slam and surge when the line fills 

and the Air/Vacuum Valve closes. 

For small pumps, Figure 933 KINETIC Air/Vacuum Valve with “Throttling Device” provides 

adjustable control of the rate and pressure at which air is discharged during filling. It is available 

from 1/2” through 4” size, for pressures to 300 psi and has all the features of the standard KINET- 

IC Valve shown on pages 19 and 20. 

For larger pumps, “Slow Closing” Air/Vacuum Valves are used to minimize the slam and surge 

of valve closure. See discussion of "Slow Closing" Valves, Figure 931, above. 

For more information on Air Valves for Deep Well Pump applications, see pages 29 and 41. 


SEWAGE SERVICE AIR/VACUUM VALVES 

Sewage Air/Vacuum Valves are designed to exhaust large amounts of air and sewage gases which are present 

in the sewage system during the filling operation. When the system is drained, either during pump shut-down 

or due to an unexpected condition such as line break, these valves quickly open to admit large volumes of air 

into the system to prevent vacuum formation and column separation. These valves should be installed both at 

the sewage pump discharge and at system highpoints where air and sewage gases would naturally rise during 

filling and/or at locations where vacuum and column separation would first occur during draining. 

Figure 935 Figure 939 


Figure 935 Standard 

Sewage Air/Vacuum Valve 

is supplied with NPT inlet 2” 

and 3” size, 125 flanged 

inlet 4” and larger. The outlet 

is normally the same 

size as the inlet, but for 

small diameter (8” and 

below) force mains, adequate 

capacity is usually 

provided with a 1” valve, 

but to prevent plugging of 

the inlet a 2” NPT connection 

is provided resulting in 

1” valve with a 2” inlet. 

Figure 935 is available in 

sizes 2” x 1” through 6”. 

Flushing attachments are 

recommended. 

Flushing Attachment: Recommended option for all Sewage Service Air Vacuum Valves, especially when used on 

raw sewage. Used to allow back-flushing of Air Vacuum Valve, includes Isolating Valves, quick-connect couplings 

and five feet of rubber hose. 

Isolating Valve: Used to isolate the Air/Vacuum Valve from system for inspection or repair, installed between 

valve and pipeline/system. 3” and smaller, a ball valve is supplied; 4” and larger, a butterfly valve is supplied. 

For more information on Air Valves for Sewage Service, see pages 12-14, 30-31, 54-58 and 60. 

Figure 939 “Short 

Body” Sewage 

Air/Vacuum Valves are 

recommended ONLY 

when the depth of the 

trench will not permit 

a Standard Sewage 

Air/Vacuum Valve to 

be installed. The “Short 

Body” Valve is available 

in sizes 2” x 1”, 2” x 2” 

and 3” x 2” and is 12” 

tall vs. 20-1/2” for the 

standard valve, but 

otherwise is identical 

to the Standard Sewage 

Air/Vacuum Valve. 

Flushing attachments 

are HIGHLY 

recommended. 

Flushing Attachments are recommended where heavy amounts of solids or grease are anticipated. 

IMPORTANT NOTE: Air/Vacuum Valves do not release air while the system is pressurized and running. If the 

system will be pressurized more than a few hours, Air/Vacuum Valves should be installed in conjunction with an 

appropriate Air Release Valve, or Combination Air Valves should be used. 


AIR/VACUUM VALVES


KINETIC AIR/VACUUM VALVE 

1/2” through 4” Inlet Size 

Standard NPT Outlet FIG. 930 

NPT OUTLET AIR/VACUUM VALVE PARTS LIST 

FIG. 930 (4”) Flange Dimension Per ANSI B16.1 

Class 125 (CL.250 Optional) 


SIZE A 

(SQUARE) 

B 

(HEIGHT) 

WEIGHT 

(LBS.) 

NPT FLG. 

1/2”, 3/4” & 1” 3-7/8” 7-1/8” 10 NA 

2” 5-3/8” 8-3/8” 20 28 

3” 6-5/8” 10-5/8” 40 52 

4” 8-1/4” 12-5/8” NA 85 


The Air/Vacuum Valve shall employ the KINETIC principle to 

automatically exhaust large quantities of air during the filling of a 

pipeline or vessel and to allow air to re-enter during draining or 

when a negative pressure occurs. Valves shall be designed to 

exhaust air at up to sonic velocity without blowing shut. 

The inlet shall be the nominal size of the valve and the outlet 

shall be the same size as the inlet. The float shall be spherical, be 

capable of withstanding a test pressure of 1000 PSIG and shall 

seal against a renewable resilient seat. 

The body and cover shall be constructed of cast iron conforming 

to ASTM A126 Class B. The float shall be made of stainless steel. 

When specified, a protective cowl shall be provided on the outlet. 

KINETIC Air/Vacuum valves shall be as manufactured by 

GA Industries, Inc., their Figure 930 (formerly GH21K-SO). 



3. SEAT - Buna-N/18-8 Stainless Steel 


5. FLOAT BALL -316 Stainless Steel 



8. FLOAT GUIDE - UHMW PE 

9. CUSHION - Buna-N 

10. REDUCING BUSHING - 

Steel (Commercial) 


Kinetic Operating Principle 

1. During the exhausting sequence, the air flowing 

around the buoy ball produces a resultant downward 

force which maintains the ball in the open position. 

2. The buoyant force of the ball will seal the exhaust 

orifice when water reaches the ball. 


NPT Inlet Body rated to 300 psi WOG; 


CL.125 FLG Inlet Body rated to 200 psi WOG; 




Ball Float tested to 1000 psi. 

Connections: 

NPT Inlet x NPT Outlet - Standard, 

1/2” through 3” size. 

CL.125 FLG Inlet x NPT Outlet - Standard, 4” size. 

CL.125 FLG Inlet x NPT Outlet - 

Optional, 2” and 3” sizes. 

CL.250 FLG Inlet x NPT Outlet - 

Optional, 2” through 4” size. 

Options: 

For Optional Outlet Cowl, specify Fig. 930-C. 

For Optional CL.125 FLG Outlet, 

specify 930-J, sizes 2” through 4”. 

FOR SIZING AND LOCATING, SEE PAGE 36-37. 



6” and 8” Flanged Inlet Size 

Standard Outlet Cowl FIG. 930 

AIR/VACUUM VALVE WITH OUTLET COWL 

FIG. 930 Flange Dimension Per ANSI B16.1 



VALVE A B WEIGHT 

SIZE (DIAMETER) (HEIGHT) (LBS.) 

6” 15-1/4” 21” 175 

8” 19” 25-1/2” 335 


The Air/Vacuum Valve shall employ the KINETIC principle to 

automatically exhaust large quantities of air during the filling of 

a pipeline or vessel and to allow air to re-enter during draining 

or when a negative pressure occurs. Valves shall be designed 

to exhaust air at up to sonic velocity without blowing shut. 

The inlet shall be the nominal size of the valve and the 

outlet shall be the same size as the inlet. The float shall be 

spherical, be capable of withstanding a test pressure of 1000 

psig and shall seal against a renewable resilient seat. 

The body and cover shall be constructed of cast iron 

conforming to ASTM A126 Class B. The float shall be made of 

stainless steel. Unless otherwise specified, a protective cowl 

shall be provided on the outlet. 

KINETIC Air/Vacuum Valves shall be as manufactured by GA 

Industries, Inc., their Figure 930 (formerly Figure GH21K-SO). 

PARTS LIST 



3. SEAT - Buna-N/Stainless Steel 






9. COWL ASSEMBLY - Steel (Commercial) 

10. COWL BOLTS - Steel Grade 2 

11. COWL WASHER - Steel (Commercial) 

12. FLOAT GUIDE - 316 Stainless Steel 









CL.125 FLG Inlet Body rated to 200 psi 

WOG; tested to 300 psi. 




Connections: 

CL.125 FLG Inlet x Outlet Cowl - Standard 

CL.250 FLG Inlet x Outlet Cowl - Optional 

Options: 


specify Fig. 930-J. 

FOR SIZING AND LOCATING, 

SEE PAGES 36-37. 


AIR/VACUUM VALVES



10” and 16” Flanged Inlet Size 

Standard Outlet Cowl FIG. 930 

AIR/VACUUM VALVE WITH OUTLET COWL 

FIG. 930 Flange Dimension Per ANSI B16.1 



VALVE A B WEIGHT 

SIZE (DIAMETER) (HEIGHT) (LBS.) 

10” 23-1/2” 33” 475 

12” 27-1/2” 39-7/8” 625 

14” 27-1/2” 39-7/8” 675 

16” 33-1/2” 48” 875 


The Air/Vacuum Valve shall employ the KINETIC principle to automatically 

exhaust large quantities of air during the filling of a pipeline 

or vessel and to allow air to re-enter during draining or when a negative 

pressure occurs. Valves shall be designed to exhaust air at up to 

sonic velocity without blowing shut. 

The inlet shall be the nominal size of the valve and the outlet shall 

be the same size as the inlet. The float shall be spherical, be capable 

of withstanding a test pressure of 1000 psig and shall seal against a 

renewable resilient seat. 

The body and cover shall be constructed of cast iron conforming to 

ASTM A126 Class B. The float shall be made of stainless steel. 

Unless otherwise specified, a protective cowl shall be provided on 

the outlet. 


Industries, Inc., their Figure 930 (formerly Figure GH21K). 

PARTS LIST 



3. SEAT - Buna-N 

4. FOLLOWER RING - 304 Stainless Steel 

5. SEAT SCREWS - 18-8 Stainless Steel 



8. CUSHION - Urethane 



11. PIPE PLUG - Malleable Iron 


















Connections: 



Options: 


specify 930-J. 




KINETIC SLOW-CLOSING 

AIR/VACUUM VALVE 

1” through 3” NPT Inlet and Outlet FIG. 931 

DEEP-WELL SERVICE GENERAL DIMENSIONS 

Air/Vacuum 

Valve 

Ref.:Pg. 23 

FIG. 931 


Surge Check 

Valve 

Ref.:Pg. 34 

Slow-Closing Air/Vacuum Valve shall employ the KINETIC principle 

to automatically exhaust large quantities of air during the filling 

of a pipeline or vessel and to allow air to re-enter during draining or 

when a negative pressure occurs. Slow-Closing Air/Vacuum Valves 

incorporate a Surge Check to minimize slam and possible damage 

to the Air Vacuum Valve during closure due to the water column. 

Slow-Closing Air/Vacuum Valves shall consist of two independent 

valves: a KINETIC Air/Vacuum Valve mounted on a Surge Check 

Valve. Both valves shall be of the same size and pressure ratings 

and shall be tested as a single unit. 

The Air/Vacuum Valve inlet shall be the nominal size of the valve 

and shall be designed to exhaust air at up to sonic velocity without 

blowing shut. The outlet shall be the same size as the inlet and shall 

have an NPT connection. The float shall be spherical, be capable of 

withstanding a test pressure of 1000 psig and shall seal against 

renewable resilient seat. 



The Surge Check shall be normally open and be designed to close 

during the transition from air to solid water, reduce the flow of water, 

slow the closing speed of the Air/Vacuum Valve and minimize slam. 

It shall return to the open position upon closure of the Air/Vacuum 

Valve to allow air re-entry during vacuum. 


Industries, Inc., their Figure 931. With optional bypass piping, specify 

Figure 931-7 (formerly Figure GH21K-SO/280). 


A B WEIGHT 





Connections: 

NPT Inlet x NPT Outlet - Standard 

Options: 

For Optional Outlet Cowl, specify 931-C. 

For Optional NPT Throttling Device, 

specify Fig. 931-P, see page 35. 

For Optional Bypass Piping, 

Fig. 931-7, consult factory. 




SIZE 

(MAX) (HEIGHT) (LBS.) 

1” 5-7/8” 13-1/4” 25 

2” 7-5/8” 15-5/8” 35 

3” 9-3/8” 16-5/8” 55 


1. During the exhausting sequence, the air 

flowing around the buoy ball produces a 

resultant downward force which maintains 

the ball in the open position. 

2. The buoyant force of the ball will seal the 

exhaust orifice when water reaches the ball. 

AIR/VACUUM VALVES




3” through 4” NPT Inlet and Outlet FIG. 931 

DEEP-WELL SERVICE 


Valve 

Ref.:Pg. 23 


Surge Check 

Valve 

Ref.:Pg. 34 

FIG. 931 

Flange Dimension Per ANSI B16.1 Class 125 (CL.250 Optional) 








valves: a KINETIC Air/Vacuum Valve mounted on and bolted to a 

Surge Check Valve. Both valves shall be of the same size and pressure 

rating and shall be tested as a single unit. 



blowing shut. The outlet shall be the same size as the inlet and 

shall have an NPT connection. The float shall be spherical, be 

capable of withstanding a test pressure of 1000 psig and shall seal 

against renewable resilient seat. 



The Surge Check shall be normally open and be designed to 

close during the transition from air to solid water, reduce the flow of 

water, slow the closing speed of the Air/Vacuum Valve and minimize 

slam. It shall return to the open position upon closure of the Air 


KINETIC Air/Vacuum Valves shall be as manufactured by 

GA Industries, Inc., their Figure 931. With optional bypass piping, 

specify Figure 931-7 (formerly Figure GH21K-SO/280). 



A B WEIGHT 


CL. 125 FLG Inlet Body rated to 200 psi 

WOG; tested to 300 psi 



Connections: 

CL.125 FLG Inlet x NPT Outlet - Standard 

CL.250 FLG Inlet x NPT Outlet - Optional 

Options: 



For Optional Outlet Cowl, specify 931-C. 

For Optional NPT Throttling Device, 

specify Fig. 931-P, see page 35. 

For Optional Bypass Piping, specify 

Fig. 931-7. 




SIZE 

(SQ.) (HEIGHT) (LBS.) 

3” 6-5/8” 16-5/8” 85 

4” 9” 20” 135 







exhaust orifice when water reaches the ball.



6” through 12” Flanged Inlet and Outlet Cowl FIG. 931 

FLANGED INLET 


Valve 

Ref.:Pgs. 24-25 

FIG. 931 

Flange Dimension 

Per ANSI B16.1 

Class 125 

(CL.250 Optional) 


Surge Check 

Valve 

Ref.:Pg. 34 








valves: a KINETIC Air/Vacuum Valve mounted on and bolted to a 

Surge Check Valve. Both valves shall be of the same size and pressure 

rating and shall be tested as a single unit. 



blowing shut. The outlet shall be the same size as the inlet and be 

provided with a protective cowl. The float shall be spherical, be 

capable of withstanding a test pressure of 1000 psig and shall seal 

against renewable resilient seat. 



The Surge Check shall be normally open and be designed to 

close during the transition from air to solid water, reduce the flow of 

water, slow the closing speed of the Air/Vacuum Valve and minimize 

slam. It shall return to the open position upon closure of the Air 


KINETIC Air/Vacuum Valves shall be as manufactured by 

GA Industries, Inc., their Figure 931. With optional bypass piping, 

specify Figure 931-7 (formerly Figure GH21K-SO/280). 



A B WEIGHT 


SIZE 

(DIAMETER) (HEIGHT) (LBS.) 

6” 15-1/4” 30-1/2” 250 

8” 19” 37-3/4” 470 

10” 23-1/2” 47-1/4” 675 

12” 27-1/2” 51-3/4” 945 

NOTE: SIZES 14” & 16” AVAILABLE 

CONSULT FACTORY 













Connections: 



Options: 



For Optional Throttling Device, 

specify Fig. 931-P, consult factory. 


Fig. 931-7. 



AIR/VACUUM VALVES


DEEP WELL SERVICE 


1/2” through 4” Size with Throttle Device FIG. 933 

DEEP-WELL SERVICE 

Throttling 

Device 

FIG. 933 



FIG. 930 

Air/Vacuum Valve 

Ref.:Pg. 23 

INLET 1/2” 3/4” 1” 2” 3” 4” 

(NPT) 

OUTLET 1/2ʼ 3/4” 1” 2” 3” 4” 

(NPT) 

A 3-7/8” 3-7/8” 3-7/8” 5-3/8” 6-5/8” 8-1/4” 

(SQ.) 

B 11-7/8” 12-5/8” 13-5/8” 17-1/2” 23-3/4” 28-1/4” 

(MAX.) 

WEIGHT 15 15 15 28 50 100 

(LBS.) 

The DEEPWELL SERVICE Air/Vacuum Valve shall employ the 

KINETIC principle to automatically exhaust controlled quantities 

of air at pump start-up and to allow air to re-enter during draining 

or when a negative pressure occurs. Valves shall be designed to 

exhaust air up to sonic velocity without blowing shut. Valve shall 

be complete with a throttle device installed on the outlet to allow 

control of the air discharge rate and pressure and column ascent 

rate. 


shall be the same size as the inlet. The float shall be spherical, 

be capable of withstanding a test pressure of 1000 psig and shall 

seal against a renewable resilient seat. 

The body and cover shall be constructed of cast iron 

conforming to ASTM A126 Class B. The float shall be made 

of stainless steel. 

KINETIC DEEPWELL SERVICE Air/Vacuum Valves shall be 

as manufactured by GA Industries, Inc., their Figure 933 

(formerly Figure GH21K-T). 

PARTS LIST 

1. BODY - Malleable Iron 


3. THREADED ROD - Steel Grade 2 

4. JAM NUT - Steel Grade 2 

5. SPRING PIN - Stainless Steel 

6. DISC - Steel (Commercial) 

7. NIPPLE - Steel (Commercial) 

















Connections: 

NPT Inlet x NPT Outlet, STANDARD, 

1/2” through 3” size. 

CL.125 FLG Inlet x NPT Outlet, Standard, 

4” size. 

CL.125 FLG Inlet x NPT Outlet, Optional, 

2” and 3” sizes. 

CL.250 FLG Inlet x NPT Outlet, Optional, 

2”, 3” and 4” sizes. 

FOR SIZING AND LOCATING SEE 

PAGES 36-37. 

FOR THROTTLING DEVICES ON VALVES 

LARGER THAN 4”, CONSULT FACTORY. 


SEWAGE SERVICE 


2” - 6” Inlet and NPT Outlet FIG. 935 

SEWAGE AIR/VACUUM 

FIG. 935 

Flange Dimension Per ANSI B16.1 

Class 125 


Flanged Inlet Shown 

(Flushing Attachments 

Not Shown) 

The Sewage Service Air/Vacuum Valve shall automatically 

exhaust large quantities of air and gases while the 

pipeline or system is being filled and allow air to reenter 

during draining or when a negative pressure 

exists. 

The valve shall be spherical float operated and shall 

close drop tight against a renewable rubber seat. All 

internal metal parts shall be made of stainless steel. 

Body and cover shall be of cast iron conforming to 

ASTM A126, Class B. Inlet connection shall be NPT to 

3” size, CL.125 FLG in 4” and larger. Outlet shall be 

NPT. 

When specified, valve shall be supplied with “Flushing 

Attachments” consisting of: bronze shut-off and flushing 

valves, quick-connect coupling and 5 ft. of rubber hose, 

for backwashing with clear water. 

The Sewage Service Air/Vacuum Valves shall be as 

manufactured by GA Industries, their Figure 935 (formerly 

Figure SAV). 


SIZE 2” x 1” 2” x 2” 3” x 2” 3” x 3” 4” 6” 

INLET 2” 2” 3” 3” 4” 6” 

OUTLET 

(NPT) 1” 2” 2” 3” 4” 6” 

A 6-1/2” 6-1/2” 6-1/2” 9-1/2” 9-1/2” 13-1/2” 

(SQUARE) 

B 20-1/2” 20-1/2” 20-1/2” 23-1/2” 25-1/2” 29” 

WEIGHT 

(LBS.) 60 60 60 170 190 320 

8”, 10”, 12” - (Manifolded 6” Valves) Also Available 

CONSULT FACTORY DETAILS 

PARTS LIST 



3. CAGE - Ductile Iron A536, Grade 65-45-12 

4. SEAT - 316 Stainless Steel 

5. PLUG - 316 Stainless Steel 





10. UPPER PLUG EXTENSION - 316 Stainless Steel 

11. CONNECTOR - 316 Stainless Steel 

12. BUSHING - 316 Stainless Steel 










22. FLOAT BOLT - Nylon 

23. CAGE BOLTS - 18-8 Stainless Steel 


25. CLOSE NIPPLE* - Steel (Commercial) 

26. COMPANION FLANGE * - Cast Iron A126 Class B 



Body rated to 200 psi WOG; tested to 300 psi 

Float tested to 1000 psi 

Connections: 

NPT Inlet x NPT Outlet - Standard, 2”x1” through 3”x3” size. 

CL.125 FLG Inlet x NPT Outlet - Standard, 4” through 6” size. 

Options: 

For Optional CL.125 FLG Outlet, Sizes 4” and 6”, 

specify Figure 935-J. 

FOR SIZING AND LOCATING, SEE PAGES 36-37. 


1. Peaks 






7. Pumps 



AIR/VACUUM VALVES


SHORT BODY SEWAGE SERVICE 


2” through 3” NPT Inlet and NPT Outlet FIG. 939 

SHORT BODY 

FIG. 939 


Screwed End Inlet Shown 

(Flushing Attachments Not Shown) 

SIZE 2” x 1” 2” x 2” 3” x 2” 

INLET 2” 2” 3” 

OUTLET 1” 2” 2” 

A (SQUARE) 6-1/2” 6-1/2” 6-1/2” 

B 11-3/4” 11-3/4” 11-3/4” 

WEIGHT (LBS.) 40 40 40 


The “SHORT BODY” Sewage Service Air/Vacuum Valve shall 

automatically exhaust large quantities of air and gases while the pipeline 

or system is being filled and allow air to reenter during draining or when 

a negative pressure exists. 

The valve shall be spherical float operated and shall close drop tight 

against a renewable rubber seat. All internal metal parts shall be made 

of stainless steel. 

Body and cover shall be of cast iron conforming to ASTM A126, 

Class B. Inlet connection shall be NTP. The overall height, less flushing 

attachments, shall be no more than 12”. 

When specified, valve shall be supplied with “Flushing Attachments” 

consisting of: bronze shut-off and flushing valves, quick-connect coupling 

and 5 ft. of rubber hose, for backwashing with clear water 

The “SHORT BODY” Sewage Service Air/Vacuum Valve shall be as 

manufactured by GA Industries, their Figure 939 (formerly Figure SAVS). 

PARTS LIST 



3. CAGE - Ductile Iron A536 Grade 65-45-12 




7. CONNECTOR - 316 Stainless Steel 






13. CAP SCREW - Nylon 






Refer to Page 35 for Flushing Attachments. 




tested to 300 psi 

Float tested to 1000 psi 

Connections: 

NPT Inlet x NPT Outlet - Standard 

2” x 1”, 2” x 2” and 3” x 2” 

FOR SIZING AND LOCATING 



1. Peaks 






7. Pumps 

8. Large Valves, Cylinders and 

Piping Loops 


HIGH CAPACITY VACUUM 

RELIEF & AIR INLET VALVE 

2-1/2” through 12” Flanged Body with Hooded 

and Screened Air Inlet 

VACUUM RELIEF/AIR INLET 

FIG. 990 


FOR WATER AND CLEAN FLUIDS 

SIZE 2-1/2” 3” 4” 6” 8” 10” 12” 

A 

(DIA.) 8” 8” 10” 12” 14” 18” 20” 

B 9-1/4” 9-3/4” 11-1/2” 14-1/2” 18” 22-1/4” 22” 

WGT. 

(LBS.) 32 38 56 85 145 215 350 

LARGE SIZES AVAILABLE, CONSULT FACTORY 


Flange Dimension Per ANSI B16.1 


The Vacuum Relief Valve shall be normally closed and open 

only when the pressure in the pipeline or vessel falls to approximately 

1/4 psi below atmospheric pressure. Rapid entry of air into 

the valve shall be accomplished by having 10% more inflow area 

than the equivalent size of the valve. 

The body of the valve shall be constructed of cast iron 

conforming to ASTM A126 Class B. The seat ring shall be made 

of bronze conforming to ASTM B62. The disc and seat ring shall 

be made of bronze conforming to ASTM B62. Tight shutoff shall 

be provided by a metal seat with a resilient seal. Internal spring 

shall be stainless steel. 

The air inlet shall be protected by a stainless steel screen, 

and steel hood to prevent the entry of foreign materials. 

The Vacuum Relief Valve shall be as manufactured by 

GA Industries, their Figure 990. 

PARTS LIST 


2. BODY SEAT - Bronze B62 

3. DISC - Bronze B62 

4. BUSHING - Bronze SAE 660 

5. SPRING - 304 Stainless Steel 

6. RESILIENT SEAT - 70 Duro Buna-N 

7. RETAINER - Steel 

8. COWL Steel (Commercial) 



11. SCREEN - 304 Stainless Steel 

12. NUTS - Steel Grade 2 


FIG. 990 






Connections: 

Hooded and Screened Air Inlet x 

CL.125 FLG - Standard 

Hooded and Screened Air Inlet x 

CL.250 FLG - Optional 




1. Peaks 






7. Pumps 


Piping Loops 


AIR/VACUUM VALVES


HIGH CAPACITY SEWAGE SERVICE 

VACUUM RELIEF & AIR INLET VALVE 

3” through 12” Flanged Body with Screened Air Inlet 

VACUUM RELIEF/AIR INLET VALVE 

FIG. 991 


SIZE 3” 4” 6” 8” 10” 12” 

A 13” 14-1/2” 16” 23” 25” 29” 

B 15-1/2” 17” 22” 23-1/4” 29-1/2” 35-1/2” 

WGT. 

(LBS.) 95 140 220 340 535 810 

LARGER SIZES AVAILABLE, CONSULT FACTORY 


The SEWAGE SERVICE Vacuum Relief Valve shall be normally closed 

and open only when the pressure in the pipeline or vessel falls below atmospheric 

pressure. The valve shall open quickly to admit large amounts of air to 

prevent vacuum formation below critical levels and then close upon restoration 

of positive pressure. 

The body of the valve shall be constructed of cast iron conforming to 

ASTM A126 Class B. The seat ring shall be made of bronze conforming to 

ASTM B62. Tight shutoff shall be provided by renewable seal. There shall be 

no internal springs in the valve. Opening vacuum pressure setting shall be 

adjustable by the amount and position of external counterweights. The air 

inlet shall be protected by a stainless steel screen, and steel hood to prevent 

entry of foreign objects. 

The Vacuum Relief Valve shall be as manufactured by GA Industries, their 

Figure 991 (formerly Figure HCV). 



CL.125 FLG Inlet Body rated to 200 psi WOG; tested to 300 psi 


Connections: 

Hooded and Screened Air Inlet x CL.125 FLG - Standard 

Hooded and Screened Air Inlet x CL.250 FLG - Optional 



1. Peaks 






7. Pumps 


Piping Loops 

PART LIST 

FIG. 991 

(Flushing 

Attachments 

Not Shown) 



2A. SEAT O-RING - Buna-N 

2B. SEAT PIN - 410/420 Stainless Steel 

3. DISC - Cast Iron A126 Class B 

4. DISC ARM - Ductile Iron A536 Grade 65-45-12 

5A. SEAT WASHER - Buna-N 

5B. SEAT FOLLOWER - Bronze B62 

5C. SEAT SCREWS - 18-8 Stainless Steel 

6. DISC NUT - Steel A307 

6A. DISC NUT WASHER - Steel (Commercial) 

6B. DISC NUT COTTER PIN - 18-8 Stainless Steel 

8. COVER GASKET - Composition 

9. COVER - Steel A36 


11. SHAFT - 303 Stainless Steel 

12. DISC ARM SET SCREW - 18-8 Stainless Steel 

13. INNER BUSHING - Bronze SAE 660 

14A. OUTER BUSHING - Bronze SAE 660 

14B. THRUST WASHER - Bronze SAE 660 

15. GLAND - Cast Iron A126 Class B 

16. GLAND STUDS - Steel A307 

17. GLAND PACKING - Graphite & Aramid 

18. SHAFT PIN - Brass SAE 72 

19. DISC ARM KEY - (Not Used On 3”) 


30. COUNTERWEIGHT ARM Cast Iron A126 Class B 

30A. COUNTERWEIGHT ARM SET SCREW 

- Steel A307 

31. COUNTERWEIGHT - Cast Iron A126 Class B 

31A. COUNTERWEIGHT ARM SET SCREW 

- Steel A307 

32. COWL Steel (Commercial) 

32A. COWL BOLTS - Steel Grade 2 

32B. SCREEN - 304 Stainless Steel 

32C. NUTS - Steel Grade 2 


SURGE CHECK VALVE 

NPT or Flanged Connections 

SURGE CHECK VALVE - FLANGED 

FIG. 284 - FLANGED FIG. 284 - NPT 

GENERAL DIMENSIONS - FLANGED ENDS 

SIZE 3” 4” 6” 8” 10” 12” 

A 7-1/2” 9” 11” 13-1/2” 16” 19” 

B 6” 7-1/4” 9-3/4” 12-1/2” 15-1/2” 14-1/4” 

WGT. 

(LBS.) 

30 45 70 125 185 305 

PARTS LIST - FLANGED 




4. DISC - Bronze B-62, 85-5-5-5 

5. SEAT - Bronze B-62, 85-5-5-5 




The Surge Check shall be designed for installation 

on the inlet of the Air/Vacuum Valve and shall close 

during the transition from air to solid water. Closure 

of the Surge Check by the water shall slow the 

velocity of the water, thereby slowing the speed of 

closure of the Air/Vacuum Valve mounted above it, 

minimizing slam and waterhammer. 

The body shall have flange or NPT connections, 

as required, to allow direct mounting beneath the 

Air/Vacuum Valve. Body shall be of cast iron conforming 

to ASTM A126 Class B. Seat ring and disc 

shall be of bronze conforming to ASTM B62. 

Surge Check Valve shall be as manufactured by 


SURGE CHECK VALVE - NPT 

GENERAL DIMENSIONS - NPT ENDS 


FIG. 284 

SIZE 1” 2” 3” 

A (MAX.) 5-7/8” 5-7/8” 5-7/8” 

B 7-1/8” 7-1/8” 5-3/4” 

WEIGHT (LBS.) 15 15 15 

PARTS LIST - NPT 

1. BODY - Ductile Iron A536 Grade 65-45-12 


3. SEAT - Bronze B-62, 85-5-5-5 

4. PLUG - Bronze B-62, 85-5-5-5 



7. REDUCING BUSHING - Cast Iron 


NPT Body rated to 300 psi WOG; tested to 450 psi 



Connections: 

NPT Inlet x NPT Outlet, Standard, 1” - 3” 

CL.125 FLG Inlet x 125 FLG Outlet, Standard, 3” - 12” 

CL.250 FLG Inlet x 250 FLG Outlet, Optional, 3” - 12” 



1. Peaks 


3. Decrease in 

Upward Slope 




7. Pumps 

8. Large Valves, 

Cylinders and 

Piping Loops 


AIR/VACUUM VALVES


THROTTLING DEVICE 

The throttling device creates an 

adjustable orifice in order to regulate 

the discharge rate of the air and thereby 

control the ascent rate of the water 

column of a deep well turbine pump. 

They are supplied standard with the 

Figure 933 Deep Well Service Air/ 

Vacuum Valve, but can also be fitted to 

any Air/Vacuum or Combination Air Valve 

for clean water. When a Throttling Device 

is required, specify “P” at the end of the 

Figure Number, for example, 945-P. 

OPTIONAL MATERIALS 

COATINGS 

NOTE: Material - Iron & Steel 

Body and Cover 

Cast Ductile Iron - ASTM A536 

Cast Steel - ASTM A216, GR WCB 

Cast Stainless Steel - ASTM A743 

Standard Coating consists of a 

heavy coat of red Phenolic primer 

on external surfaces. 

Optional 

AWWA C550 Fusion-Bonded Epoxy 

Asphalt Varnish 

2-Part Epoxy 

KF Polymer ® /Dynar ® (PVDF) 

IF OPTIONAL MATERIALS OR 

COATINGS ARE REQUIRED, 



ISOLATING VALVE 

Air Valves always should be installed with an isolating valve between 

the air valve and the line, to allow the valve to be serviced or replaced 

without shutting down the line. For sizes up to 3” NPT, a Figure 20 

Bronze Ball Valve will be furnished, and for sizes 4” and up with a 

flanged connection, a Figure 30 Lugged Butterfly Valve will be supplied 

as an isolating valve. 

(When required, specify “I” at end of Model/Figure Number.) 

BACKFLUSH ATTACHMENTS 

VALVE DIMENSIONS WITH BACKFLUSH ATTACHMENTS 

Figure 935 

STANDARD 

Air/Vacuum Valves for sewage service 

(Figure Nos. 935 & 939) should be 

supplied with “Backflush Attachments” 

to allow periodic flushing of sediment, 

grease and solids from the valve. 

Backflush Attachments shall consist of: 

a bronze ball valve (to 3”) or lugged type 

butterfly valve (4” and up) to isolate the 

valve from the line for backflushing, 

bronze blow-off and flushing valves, 

a minimum of 5 ft. or rubber hose and 

quick-disconnects for connection to a 

clear water source. When Backflush 

Attachments are required, specify “F” 

at the end of the Figure Number. 

For example, Figure 935-F. 

Figure 939 

SHORT BODY 

SIZE HEIGHT WEIGHT HEIGHT WEIGHT 

2”x1” NPT 26-1/4” 72 lbs. 17-3/4” 57 lbs. 

2”x2” NPT 26-1/4” 72 lbs. 17-3/4” 57 lbs. 

3”x2” NPT 26-1/4” 80 lbs. 17-3/4” 65 lbs. 

3”x3” NPT 29-1/4” 185 lbs. NA NA 

4” FLG 27-1/2” 210 lbs. NA NA 

6” FLG 31-1/2” 350 lbs. NA NA 


SIZING AIR/VACUUM VALVES 

FOR EXHAUSTING AIR WHILE FILLING & ADMITTING AIR WHILE DRAINING 

1. Determine valve size independently for each high point in line. 

2. Calculate valve size for more severe of the two slopes adjacent to the high point. 

3. Determine the maximum rate of flow which could occur, either during filling or draining, and size for this maximum flow. The rate of flow when 

pushing water uphill during filling may be significantly less than that which occurs during reverse flow down the same slope when draining. 

4. Calculate size valve required for both outflow (filling) and inflow (draining), select larger of the two requirements. 

I. TO EXHAUST AIR WHEN FILLING PIPE LINE 

A. Size valve to exhaust air at a rate equal to the pumping rate or the 

design pipe fill rate. 

B. If the table is to be used: Convert system liquid flow in GPM (Gallons per 

Minute) to air flow terminology which is shown in SCFM (Standard Cubic 

Foot per Minute) 

SCFM= 

Q Q = Flow in GPM 

7.48 SCFM = Flow in Standard Cubic Foot per Minute 

C. Enter the SCFM air discharge into graph 1A, B or C (page 37) or Table 1 

(below); or enter the pumping rate into Table 1 (below) at the desired 

differential pressure (∆P) to obtain the correct valve size. 

NOTE: 

1. Use a ∆P of 5 PSI for Kinetic Air Valves. Kinetic Valves can be vented 

at virtually any ∆P without blowing shut, however it should be noted 

that ∆Pʼs in excess of 13 PSI could cause excessive noise levels. 

2. Use a ∆P of 2 PSI for conventional valves (at pressures in excess of 2 

PSI conventional air valves will blow shut prior to exhausting all air). 

D. When used at Deep Well Pump discharge or if velocities exceed 10 FPS, 

consider throttling device and/or “Slow-Closing Valves.” 

E. Do not fill at pressure greater than 50% of system static pressure. 

DONʼT OVERSIZE - When the required inflow capacity is much greater 

than the outflow, sizing the Air/Vacuum Valve to accommodate the 

inflow will cause the valve to be oversized for outflow, resulting in 

an excessive filling speed. Rather, size for optimum filling rate and 

supplement vacuum sizing with Vacuum Relief Valves (Figure 990) 

so that total inflow capacity is spread over several valves, but 

outflow is only through the Air/Vacuum Valve. 

NOTE: CONSULT FACTORY IF OPERATING 


II. TO ADMIT AIR INTO PIPELINE WHEN DRAINING THE 

LINE OR FOR LINE-BREAK PROTECTION 

A. Determine required air inflow capacity; equivalent to the draining rate 

(CFM) or flow generated by gravity in a line-break situation. Required air 

inflow capacity due to gravity flow can be determined by using Graph 2 

(page 37) or by the following equation: 

Gravity Flow (SCFM) = 4.72 SD 5 

S = Pipeline Slope (ft./ft.) 

D = Pipeline Diameter (in.) 

NOTE: Above equation assumes pipeline friction factor 

“C” = 100 (Hazen-Wm.) 

For “C” other than 100, multiply SCFM from equation by C/100. 

B. Determine max. allowable negative pipeline pressure to avoid collapse; 

-5 psig can normally be used for small diameter cast iron or ductile iron 

pipe. Larger diameter, thin-walled pipe may collapse under minimal 

negative pressures. In these cases, the pipe manufacturer or a pipe 

design handbook should be consulted to determine the maximum 

allowable negative pressure with respect to pipeline material, bedding 

characteristics, location of stiffening ring, etc. 

C. Enter required air inflow capacity and maximum allowable negative 

pressure into Graph 1A, B or C or Table 2 (page 37) to determine the 

Air/Vacuum Valve size required. 

NOTE: A kinetic type air valve is capable of exhausting a greater volume 

of air than a conventional air valve because it is specifically 

designed not to blow shut and therefore can be operated at higher 

differential pressures. 

@ NOMINAL DIA. 

TABLE 1 MAXIMUM FILLING RATE IN GPM* MAXIMUM VENTING CAPACITY IN SCFM ( w/Cd =0.7 )** 

VALVE 

SIZE 1/2” 3/4” 1” 2” 3” 4” 6” 8” 10” 12” 14” 16” 

1 

137 

19.6 

310 550 

44.2 

2,200 

78.5 314 

4,950 

707 

8,800 19,800 35,200 

1,260 2,830 5,030 

55,000 

7,850 

79,200 108,000 141,000 

11,300 15,400 20,100 

2 

183 

27.8 

412 731 

62.5 

2,930 

111 444 

6,580 

1,000 

11,700 26,300 46,800 

1,780 4,000 7,110 

73,100 

11,100 

105,000 143,000 187,000 

16,000 21,800 28,400 

3 

211 

34.0 

475 845 

76.5 

3,380 

136 544 

7,610 

1,220 

13,500 30,400 54,100 

2,180 4,900 8,710 

84,500 

13,600 

122,000 166,000 216,000 

19,600 26,700 34,800 

4 

231 

39.3 

520 924 

88.4 

3,690 

157 628 

8,310 

1,410 

14,800 33,300 59,100 

2,510 5,660 10,100 

92,400 

15,700 

133,000 181,000 236,000 

22,600 30,800 40,200 

5 

245 551 980 3,920 8,820 15,700 35,300 62,700 98,000 141,000 192,000 251,000 

43.9 98.8 176 703 1,580 2,810 6,320 11,200 17,600 25,300 34,400 45,000 

6 

256 574 1,020 4,090 9,200 16,400 36,800 65,400 102,000 147,000 200,000 262,000 

48.1 108 192 770 1,730 3,080 6,930 12,300 19,200 27,700 37,700 49,300 

7 

263 

52.0 

593 1,050 

117 

4,210 

208 831 

9,480 

1,870 

16,800 37,900 67,400 

3,320 7,480 13,300 

105,000 

20,800 

152,000 206,000 270,000 

29,900 40,700 53,200 

8 

269 

55.5 

605 1,080 

125 

4,300 

222 889 

9,680 

2,000 

17,200 38,700 68,900 

3,550 8,000 14,200 

108,000 

22,200 

155,000 211,000 275,000 

32,000 43,500 56,900 

9 

273 

58.9 

617 1,090 

133 

4,370 

236 943 

9,840 

2,120 

17,500 39,400 70,000 

3,770 8,480 15,100 

109,000 

23,600 

157,000 214,000 280,000 

33,900 46,200 60,300 

10 

276 

62.1 

623 1,110 

140 

4,420 

248 994 

9,950 

2,240 

17,700 39,800 70,800 

3,970 8,940 15,900 

111,000 

24,800 

159,000 217,000 283,000 

35,800 48,700 63,600 

15 

278 

75.2 

626 1,130 

169 

4,500 

304 1,217 

10,100 

2,740 

18,000 40,500 71,300 

4,870 11,000 19,500 

113,000 

30,400 

162,000 221,000 288,000 

43,800 59,600 77,900 

FILLING PRESSURE IN PSIG 

GPM* = Gallons per minute ** = SCFM = Standard cubic feet per minute 


AIR/VACUUM VALVES


GRAPH 1A 

GRAPH 1C 

VALVE 

SIZE 

Permissible Vacuum 

Pressure PSIG 

1 

2 

3 

4 

5 

SIZING AIR/VACUUM VALVES 

GRAPH 1B 

GRAPH 2 

TABLE 2. MAXIMUM AIR INFLOW RATE IN SCFM (@ NOMINAL DIA. w/Cd = 0.7)* 

1/2” 3/4” 1” 1-1/2” 2” 3” 4” 6” 8” 10” 12” 14” 16” 

20.0 45.2 80 180 320 721 1,280 2,880 5,130 8,010 11,600 15,700 20,600 

28.3 63.9 113 255 453 1,020 1,810 4,080 7,250 11,300 16,400 22,300 29,100 

34.7 78.3 138 312 555 1,250 2,220 5,000 8,880 13,900 20,000 27,300 35,600 

40.1 90.4 160 361 641 1,440 2,560 5,770 10,300 16,000 23,100 31,500 41,100 

44.9 101 179 403 716 1,610 2,870 6,430 11,500 17,900 25,900 35,200 46,000 

*SCFM = Standard Cubic Feet per Minute 

For where to install Air Vacuum Valves, see page 17. 

PIPELINE FLOW DUE TO GRAVITY 

PIPELINE DIAMETER (IN) 

Page 37 A Product GA of Industries





Why Use Combination Air Valves? 

While Air Release Valves can exhaust the small pockets 

of air that collect in the pipeline while the system is pressurized, 

their orifice is usually not big enough to admit a 

sufficient quantity of air to prevent critical vacuum formation. 

On the other hand, Air/Vacuum Valves have big orifices 

to purge large volumes of air at start-up and to 

admit large amounts of air during draining to prevent vacuum 

formation, but they cannot release the small, residual 

air pockets that form while in operation. Most applications 

for Automatic Air Valves require air to be exhausted 

both at start-up and while operating and to incorporate 

vacuum protection during draining. Nether the Air 

Release nor the Air/Vacuum Valve can perform all three 

functions when used alone. 


Combination Air Valves purge air from the system at 

start-up, vent small pockets of air while the system is 

pressurized and running, and prevent critical vacuum 

conditions during draining. 


Combination Air Valves are installed at high points in the 

pipeline where air would naturally tend to rise during filling 

and collect during operation and/or where vacuum 

would tend to form when the system is drained. The 

Air/Vacuum (large) and Air Release (small) orifices are 

normally open and both exhaust air during filling, with the 

great majority of the air passing through the large orifice. 

The rate of air discharge is a function of the pressure 

across the orifice. Incoming fluid compresses the air until 

sufficient pressure develops to give the air an exhaust 

rate equal to the rate of the incoming fluid. Once all the 

air has been purged, the valve float is lifted by the liquid 

and the large (and small) orifice closes. System pressure 

holds the large orifice closed, but small pockets of air 

entering the valve displace the liquid until the level drops 

sufficiently to allow the Air Release (small) orifice to open 

and vent the small amounts of air that have collected in 

the valve. As soon as the system pressure drops to 

atmospheric (impending vacuum) the float drops opening 

the large orifice and large amounts of air are admitted to 

prevent a critical vacuum condition and subsequent damage 

to the pipeline or system. 

IMPORTANT NOTE: Most applications for Automatic 

Air Valves require Combination Air Valves for adequate 

air venting and vacuum protection. 

COMBINATION AIR VALVES... 


Combination Air Valves are primarily used on water 

mains, transmission lines and sewage force mains. 

They are also used at the discharge of pumps, especially 

Deep Well Turbine Pumps, to control the ascent rate 

of the rising water column, and to vent the dissolved air 

that escapes from the liquid while the pump is running 

and to break the vacuum when the pump stops. 

KINETIC OR CONVENTIONAL DESIGN? 

Air/Vacuum Valves are an integral part of 

Combination Air Valves and as such can be of the 

KINETIC or CONVENTIONAL design. The KINETIC 

Air Vacuum Valve is designed not to be blown shut 

by the exhausting air stream regardless of the pressure 

at exit velocities approaching sonic velocity. 

After all the air has been purged, liquid entering the 

valve picks up the ball and floats it closed. KINETIC 

valves can be sized to create back pressure while 

filling the line. All of G.A. Industriesʼ CLEAN WATER 

Combination Air Valves are of the KINETIC design. 

All of G.A. Industriesʼ SEWAGE SERVICE 

Combination Air Valves utilize CONVENTIONAL 

design Air/Vacuum valves. These valves usually are 

installed on applications where the discharge air 

velocity and pressure are below the critical values 

that would cause them to blow shut. Maximum discharge 

pressure for conventional design 

Combination Air Valves is 2 psi. 

For more information on KINETIC Air/Vacuum 

Valves, see pages 19-21, 23-29. 


Flushing Attachment: Recommended option for all 

sewage service air vacuum valves, especially when 

used on raw sewage. Used to allow back-flushing 

of combination air valve, includes isolating valves, 

quick-connect couplings and 5 ft. of rubber hose. 

Isolating Valve: Used to isolate the Combination Air 

Valve from system for inspection or repair. Installed 

between valve and pipeline/system, 3” and smaller, 

ball valve is supplied, 4” and larger, butterfly valve 

is supplied. 


For Clean Water 

KINETIC DESIGN KINETIC “SLOW-CLOSING” 

Figure 945 

REFER TO PAGE 42-45 FOR DETAILS 

Figure 945 KINETIC 

Combination is a compact, 

economical and lightweight 

valve that has all stainless 

steel trim. It is available in 

1/2” through 4” NPT for working 

pressures to 300 psi. It is 

KINETIC so it is designed not 

to blow shut and as such, is 

ideal for use on the discharge 

of small Turbine Pumps and 

can be supplied with a 

Throttling Device to control 

the ascent rate of the rising 

water column. 

Figure 950. “CUSTOM” 

KINETIC Combination Air 

Valve is made up of two 

individual valves, piped 

together and supplied as a 

unit. Although standard 

valves are paired, special 

combinations are available, 

hence the “custom” designation. 

Sizes 1/2” through 

3” are available NPT while 

2” through 16” are available 

with ANSI B16.1 Class 125 

or 250 flanges. Standard iron body and all stainless steel 

trim. The KINETIC Valve allows higher air discharge pressure 

and is designed not to blow shut. Ideal for high 

velocity systems and Deep Well Turbine Pumps. 


Figure 960. KINETIC Combination 

Air Valves have a one piece body 

(2”-4”) or a unique “Bolt-On” Air 

Release Valve (6”-16”) for a 

rugged, heavy-duty valve, well 

suited to applications where vibration, 

shock and water hammer are 

possible. There are no threaded 

joints to loosen, leak or breakoff. 

Available with 125 or 250 flanged 

connection, the Fig. 960 has all 

stainless steel trim. The KINETIC 

Valve allows higher air discharge 

pressure and is designed not to 

blow shut. Available in alternate 

materials (steel, ductile, stainless steel) for extreme service or higher 

pressure on special order. The Fig. 961 has larger air release orifice 

for greater venting rate, otherwise it is the same as the Fig. 960. 


Figure 980, 981 

Figure 950 Fig. 983, 984, 985 

Figure 960, 961 

Figure 980 KINETIC “Slow 

closing” Combination Air 

Valves are used at high points 

where valve can be above the 

hydraulic gradient during some 

operating conditions; where 

pipeline velocity is expected to 

exceed 10 FPS, such as on 

transmission lines where 

surges could be encountered; 

or at the discharge of high volume 

Deep Well Turbine 

Pumps. These valves consist 

of a Fig. 960 (or 961) KINETIC Combination Air Valve mounted 

on top of a Surge Check Valve. The Surge Check absorbs the 

energy of the high velocity water by throttling the flow of water 

into the Air/Vacuum Valve, preventing rapid closure and the 

related surge and water hammer. 

REFER TO PAGE 52 FOR DETAILS 

These “Custom” 

Combination Air Valves 

consist of a Custom Air 

Valve (Fig. 950, 951 or 

952) mounted on and bolted 

to a Surge Check Valve. 

Standard construction is 

Figure 983, while the 984 

and 985 provide larger air 

release capacity. These 

valves are ideally suited for 

Deep Well Pumps inside a 

pump house as NPT outlets 

are available up to 4”. 

Figure 983, 984 and 985 

are available 3” through 16” 

with ANSI B16.1 Class 125 or 250 flanges. 


SIZING COMBINATION AIR VALVES 

Combination Air Valves have two independent orifices, a large 

(Air/Vacuum) and small (Air Release). They may be contained in 

a separate valve or there may be two orifices in a single housing. 

In either case, each orifice size and capacity must be determined 

individually. 

For the Air/Vacuum (larger orifice) refer to pages 36 and 37 and 

select the proper sizing method. Be sure to determine orifice size for 

both exhausting and inflow under vacuum. Combination Air Valveʼs 

nominal size is the Air/Vacuum (large orifice) size. 

For the Air/Release (small orifice), follow these steps: 

1. For “Custom” Combinations, determine the Figure Number of 

the Air Release Valve used, the operating pressure and orifice 

size suitable for that pressure. 

2. For other Combination Air Valves, determine the orifice(s) that 

are available, noting valve size and operating pressure. 

3. Refer to Pages 16 and 17 to determine the venting capacity of 

the selected orifice at the working pressure. Select standard 

size orifice wherever possible. 


COMBINATION AIR VALVES


Figure 942 


Figure 957 


FOR SEWAGE & DEEP WELL SERVICE 

Figure 942 “DUOMATIC” 

Sewage Combination Air Valve 

provides both Air/Vacuum and Air 

Release capability in a single 

valve body. It is very compact 

and light weight compared to the 

“Custom Series” of Sewage 

Combination Valves. Standard 

with NPT inlet in sizes 1” through 

3” and ANSI B16.1 Class 125 

flanges in 4” and 6”, with all 

stainless trim. 1” size has 2” NPT 

inlet to prevent plugging and is 

usually suitable for up to 8” diameter 

force mains. Maximum working 

pressure is 150 psi. Flushing 

attachments are recommended. 

Figure 957 “High Capacity” 

Sewage Combination Air 

Valve utilizes a Standard 

Figure 935 Air/Vacuum 

Valve and a Figure 927 High 

Capacity Sewage Air 

Release Valve, piped into an 

assembly. The large orifice 

on the Figure 927 allows for 

up to 320 SCFM of air to be 

released while pressurized. 

Recommended for large 

diameter force mains or 

where large amounts of air 

and gas must be released. 

Available with 4” through 6” inlets with ANSI B16.1 Class 

125 flanges. Flushing attachments are recommended. 


Figure 955 

Custom Sewage 

Combination Air Valve 

consists of two independent 

valves piped together 

into an assembly. The 

required size Figure 935 

Sewage Air/Vacuum and 

Figure 925 Sewage Air 

Release, in 2” size, are 

supplied with interconnecting 

piping and valves. 

Available in 2” x 1” 

through 3” NPT and 4” 

through 6” in ANSI B16.1 

Class 125 flange with all 

stainless steel trim. Flushing attachments are recommended. 


Figure 959 

Figure 959 

“Short Body” 

Sewage 

Combination Air 

Valve consists 

of Figure 939 

Short Body 

Air/Vacuum and 

a Figure 929 

Short Body Air 

Release Valve, 

piped together 

into an assembly. 

It is recommended 

ONLY when the trench depth will not accommodate a 

“Standard” (Fig. 955) Combination Air Valve. Only 17” overall height, 

the Figure 959 requires more frequent backflushing than the standard 

Figure 955 if used on a system with high solids or grease. Available in 

2” x 1” and 2” x 2” and 3” x 2” NPT with all stainless steel trim. 

Flushing attachments HIGHLY RECOMMENDED. 


COMBINATION AIR VALVES FOR DEEP WELL TURBINE PUMPS 

KINETIC VALVES DESIGNED NOT TO BLOW SHUT! 

KINETIC Combination Air Valves are well-suited for use on Deep Well Turbine 

Pumps. Installed between the pump and the Discharge Check Valve, 

they serve three purposes: 

1. To purge air from the well column at start up at a pressure which 

slows the ascent of the water. 

2. To release residual air pockets while the pump is running. 

3 To break the vacuum when the pump shuts down, the Check Valve 

closes and water drains into the well. 

For small pumps, Figure 945 or 950 can be fitted with a “throttling device” 

(see page 35) to provide an adjustable control of the pressure at which air is 

discharged during filling. 

Figure 945 

w/ Throttle Device 

For large pumps, “Slow-Closing” Valves, Figure 980 through 985 are used. The 

Surge Check minimizes slam, surge and waterhammer. Figure 954 has threaded or 

flanged outlet to facilitate piping of outlet to drain. 

For more information on Deep Well Pump Combination Air Valves, see pages 21, 26-29. 

Figure 984 


KINETIC COMPACT 

COMBINATION AIR VALVE 

1/2” through 1” NPT Inlet and Outlet FIG. 945 

COMBINETIC 

FIG. 945 


VALVE A B C WEIGHT 

SIZE (SQUARE) (HEIGHT) (WIDTH) (LBS.) 

1/2” NPT 6-1/4” 7-1/4” 3-7/8” 16 

3/4” NPT 6-1/4” 7-1/4” 3-7/8” 16 

1” NPT 6-1/4” 7-1/4” 3-7/8” 16 


The Combination Air Valve shall consist of a KINETIC Air & Vacuum 

Valve and an Air Release Valve contained in a single body housing. The 

valve shall be designed to exhaust large amounts of air during filling, to 

release small amounts of accumulated air during operation and to admit 

large amounts of air upon impending vacuum during draining. 

The inlet shall be the nominal size of the valve and the outlet shall be the 

same size as the inlet. Body and cover shall be of cast iron conforming to 

ASTM A126, Class B. The Air & Vacuum portion of the valve shall be 

designed to exhaust air at up to sonic velocity without blowing shut. The 

floats shall be spherical and shall be capable of withstanding a test pressure 

of 1000 psi. The Air Release portion shall have a stainless steel leverage 

mechanism and float. The small orifice shall be stainless steel and have a 

rubber seat. 

KINETIC Compact Combination Air Valves shall be as manufactured by 


PARTS LIST 



3. SEAT (Air Vacuum) - Buna-N 

4. SUPPORT RING - 316 Stainless Steel 

5. FLOAT BALL (Air Vacuum) - 316 Stainless Steel 








13. FLOAT BALL (Air Release) - 316 Stainless Steel 



16. SLOTTED SPRING PIN - 410/420 Stainless Steel 



19. COUNTERSUNK PLUG - Steel (Commercial) 



21. BALL GUIDE - UHMW-PE 


Kinetic Operating Principle of the Combinetic Valve: 

1. During the exhausting sequence, the air flowing around 

the large orifice buoy ball produces a resultant downward 


2. The buoyant force of the balls will seal both 

orifices when water reaches the balls. 


NPT Inlet Body rated to 300 psi WOG; tested to 450 psi 



10-150 psi with 3/32” orifice (Standard - Fig. 945) 

10-300 psi with 1/16” orifice (Optional - Fig. 945H) 



Small Orifice (Air Release) Maximum Venting Rate: 

Figure 945@ 150 psi with 3/32” orifice = 14.7 SCFM 

Figure 945-H@ 300 psi with 1/16” orifice = 8.5 SCFM 

FOR SIZING AND LOCATING SEE PAGES 16-17, 36-37. 

Connections: 

Inlet - NPT, Standard 

Outlet - NPT, Standard 

Options: 

For Optional Cowl, specify 945-C. 

For Optional Throttling Device, specify 945-P 

see pages 41 and 35. 






2” NPT Inlet and Outlet FIG. 945 

COMBINETIC 

FIG. 945 




2” 9” 9-3/8” 4-3/4” 30 


The Combination Air Valve shall consist of a KINETIC Air & 

Vacuum Valve and an Air Release Valve contained in a single 

body housing. The valve shall be designed to exhaust 

large amounts of air during filling, to release small amounts 

of accumulated air during operation and to admit large 

amounts of air upon impending vacuum during draining. 


shall be the same size as the inlet. Body and covers shall 

be of cast iron conforming to ASTM A126, Class B. The Air & 

Vacuum portion of the valve shall be designed to exhaust air 

at up to sonic velocity without blowing shut. The floats shall 

be spherical and shall be capable of withstanding a test 

pressure of 1000 psi. The Air Release portion shall have a 

stainless steel leverage mechanism and float. The small orifice 

shall be stainless steel and have a rubber seat. 

KINETIC Compact Combination Air Valves shall be as 

manufactured by GA Industries, Inc., their Figure 945. 

PARTS LIST 



3. SEAT - Buna-N 



6. SEAT FOLLOWER - 316 Stainless Steel 







13. LOCATING SCREW - 18-8 Stainless Steel 

14. FLOAT BALL (Air Release) - 316 Stainless Steel 







21. BALL GUIDE - UHMW-PE 









NPT Inlet Body rated to 300 psi WOG; test to 450 psi 









Figure 945-H@ 300 psi with 3/32” orifice = 28 SCFM 


Connections: 

Inlet - NPT, Standard; CL.125 or 250 FLG Optional 

Outlet - NPT, Standard; CL.125 FLG Optional 

Options: 




For Optional CL.125 FLG Outlet, specify 945-J. 





COMBINETIC PARTS LIST 

FIG. 945 




3ʼ NPT 12-3/8” 12-1/4” 6-5/8” 65 


The Combination Air Valve shall consist of a KINETIC Air & 

Vacuum Valve and an Air Release Valve contained in a single 

body housing. The valve shall be designed to exhaust 

large amounts of air during filling, to release small amounts 

of accumulated air during operation and to admit large 

amounts of air upon impending vacuum during draining. 


shall be the same size as the inlet. Body and covers shall 

be of cast iron conforming to ASTM A126, Class B. The Air & 

Vacuum portion of the valve shall be designed to exhaust air 

at up to sonic velocity without blowing shut. The floats shall 

be spherical and shall be capable of withstanding a test 

pressure of 1000 psi. The Air Release portion shall have a 

stainless steel leverage mechanism and float. The small orifice 

shall be stainless steel and have a rubber seat. 

KINETIC Compact Combination Air Valves shall be as 




3. SEAT - Buna-N Stainless Steel 














17. BRACKET SCREWS - 18-8 Stainless Steel 

18. FLOAT PIVOT LINK - 316 Stainless Steel 






24. BALL GUIDE - 316 Stainless Steel 









NPT Inlet Body rated to 300 psi WOG; tested to 450 psi. 












Connections: 

Inlet - NPT, Standard; CL.125 or 250 FLG Optional 

Outlet - NPT, Standard; CL.125 FLG Optional 

Options: 











COMBINETIC PARTS LIST 

FIG. 945 



Optional Flanged Inlet 

VALVE A B C D WEIGHT 

SIZE (LENGTH) (HEIGHT) (WIDTH) (OPT. FLANGE) (LBS.) 

4” 15-1/4” 13-1/4” 8-1/4” X 120 

4” 15-1/4” 13-1/4” 8-1/4” 15-1/2” 133 

The Combination Air Valve shall consist of a KINETIC Air & Vacuum 

Valve and an Air Release Valve contained in a single body housing. The 

valve shall be designed to exhaust large amounts of air during filling, to 

release small amounts of accumulated air during operation and to admit 

large amounts of air upon impending vacuum during draining. 

The inlet shall be the nominal size of the valve and the outlet shall 

be the same size as the inlet. Body and covers shall be of cast iron conforming 

to ASTM A126, Class B. The Air & Vacuum portion of the valve 

shall be designed to exhaust air at up to sonic velocity without blowing 

shut. The floats shall be spherical and shall be capable of withstanding a 

test pressure of 1000 psi. The Air Release portion shall have a stainless 

steel leverage mechanism and float. The small orifice shall be stainless 

steel and have a rubber seat. 

KINETIC Compact Combination Air Valves shall be as manufactured 

by GA Industries, Inc., their Figure 945. 


2. COVER (Air Vacuum) - Cast Iron A126 Class B 

3. BALL (Air Vacuum) - 316 Stainless Steel 


5. COVER BOLTS (Air Vacuum) - Steel Grade 2 


7. BALL GUIDE - 316 Stainless Steel 


9. LEVERAGE BRACKET - 302/304 Stainless Steel 




13. FLOAT PIVOT LINK - 316 Stainless Steel 

14. CAP SCREW - 18-8 Stainless Steel 




18. BALL (Air Vacuum) - 316 Stainless Steel 







25. COVER BOLTS (Air Release) - Steel Grade 2 









NPT Inlet Body rated to 300 psi WOG; tested to 450 psi 



10-150 psi with 3/16” orifice, (Standard - Fig. 945) 

10-300 psi with 1/8” orifice, (Optional - Fig. 945-H) 








Connections: 

Inlet - NPT, Standard; CL.125 or 250 FLG, Optional 

Outlet - NPT, Standard; CL.125 FLG, Optional 

Options: 


For Optional Throttling Device, specify 945-P, 




KINETIC CUSTOM 


1/2” through 4” Inlet / Standard NPT Outlet FIG. 950 

CUSTOM KINETIC ENGINEERING DATA 

FIG. 950 (4”) Flange Dimension Per ANSI B16.1 



SIZE 1/2”, 3/4”, 1” NPT 2” NPT 3” NPT 4” FLG 

A 7-5/8” 9-1/8” 10-3/8” 12” 

B 7-3/8” 9” 10-3/8” 11-7/8” 

C 4” 5-3/8” 6-5/8” 9” 

WGT. 

(LBS.) 

15 25 45 90 


The Custom Combination Air Valve shall consist of two independent 

valves piped together and tested as a unit. The Combination Air Valve 

shall be designed to exhaust large amounts of air during filling, release 

small amounts of accumulated air during operation and open upon 

impending vacuum to admit air while draining. 

The Air & Vacuum Valve inlet shall be the nominal size of the valve 

and shall be the same size as the outlet. It shall be designed to 

exhaust air at up to sonic velocity without blowing shut. The air vacuum 

float shall be spherical stainless steel and capable of withstanding a 

test pressure of 1000 psi. The Air Release Valve shall have stainless 

steel leverage mechanism and spherical float capable of withstanding a 

test pressure of 1000 psi. Both valves shall have bodies and covers of 

cast iron conforming to ASTM A126, Class B. 

KINETIC Custom Combination Air Valves shall be as manufactured 

by GA Industries, Inc., their Figure 950. 

With optional cowl and bronze isolation valve specify Figure 950-IC 

(formerly Figure AR/GH21K). 


1. During the exhausting sequence, 

the air flowing around the buoy ball 

produces a resultant downward force 

which maintains the ball in the open position. 





Small Orifice (Air Release) 


Small Orifice Air Release see page 6 

Large Orifice Air Vacuum see page 23 




16-17, 36-37 

Connections: 

Inlet - NPT, Standard, 1/2” - 3” 

CL.125 FLG, Standard, 4” , Optional 2” - 3” 

CL.250 FLG, Optional, 2” - 4” 

Outlet - NPT, Standard, 1/2” - 4” 


Options: 

For Optional Outlet Cowl specify 950-C. 

For Optional Bronze Isolation Valve between 

Air Release and Air Vacuum Valve, 

specify Figure 950-I. 


specify Figure 950-J. 






1/2” through 4” Inlet Standard NPT Outlet FIG. 951/952 

CUSTOM KINETIC 

FIG. 951/952 - (951) (4”) Flange Dimension Per ANSI B16.1 

Depicted Class 125 (CL.250 Optional) 


SIZE 1/2”, 3/4”, 1” NPT 2” NPT 3” NPT 4” NPT 

A 9-1/2” 11” 12-1/4” 14-1/4” 

B 11-1/4” 12-7/8” 14-1/4” 15-3/4” 

C 5-1/8” 5-3/8” 6-5/8” 9” 

WGT. 

(LBS.) 

20 30 50 95 









exhaust air at up to sonic velocity without blowing shut. The floats 

shall be spherical stainless steel and capable of withstanding a test 

pressure of 1000 psi. The Air Release Valve shall have stainless steel 

leverage mechanism and float. Both valves shall have bodies and covers 

of cast iron conforming to ASTM A126, Class B. 

KINETIC Custom Combination Air Valves shall be as manufactured 

by GA Industries, Inc., their Figure 951 or 952 as required. With optional 

cowl and bronze isolation valve specify Figure 951-IC or 952-IC 

(formerly Figure AR/GH21K). 

PARTS LIST 



ITEM 

1 

2 

VALVE 

TYPE 

FIG. 951 FIG. 952 

Air 

Vacuum 

FIG. 930 - See Page 23 

Air FIG. 910 FIG. 912 

Release See Page 7 See Page 8 

3 

Isolating 

Valve 

Optional Between 

Air Release and Air Vacuum 

See Individual Figure No. Sheets for Parts Details. 











FIG. 951 


Large Orifice Air Vacuum see pages 23 

FIG. 952 


Large Orifice Air Vacuum see pages 23 




16-17, 36-37 

Connections: 

Inlet - NPT, Standard, 1/2” - 3” 

CL.125 FLG, Standard, 4” , Optional 2” - 3” 

CL.250 FLG Optional, 2” - 4” 


CL.125 FLG Optional, 2” - 4” 

Options: 

For Optional Outlet Cowl specify 951-C or 952-C. 


Air Release and Vacuum Valve, 

specify Figure 951-I 952-I. 


specify Figure 951-J or 952-J.



6” through 16” Size, Flanged Inlet, Standard Outlet Cowl FIG. 950/951 

CUSTOM KINETIC PARTS LIST 

Air Release 

Valve 

FIG. 950/951 


Air 

Vacuum 

Valve 

SIZE 6” 8” 10” 12” 14” 16” 

A 

(LENGTH) 21-5/8” 25-3/8” 29-7/8” 33-7/8” 33-7/8” 39-7/8” 

B 

(HEIGHT/MAX.) 20-3/4” 25-1/4” 33” 39-7/8” 39-7/8” 48” 

C 

(WIDTH) 15-1/4” 19” 23-1/2” 27-1/2” 27-1/2” 33-1/2” 

WGT. 

(LBS.) 200 360 500 650 700 900 









exhaust air at up to sonic velocity without blowing shut. The floats 

shall be spherical stainless steel and capable of withstanding a test 

pressure of 1000 psi. The Air Release Valve shall have stainless steel 

leverage mechanism and float. Both valves shall have bodies and covers 

of cast iron conforming to ASTM A126, Class B. 

KINETIC Custom Combination Air Valves shall as manufactured by 

GA Industries, Inc., their Figure 950 or 951 as required. With optional 

bronze isolation valve specify Figure 950-I or 951-I (formerly Figure 

AR/GH21K). 

Combination Air Release Air Vacuum 

Valve Figure Size Valve Valve 

No. Figure No. Figure No. 

950 6-16” 

951 6-16” 


920 930 

Ref.: Ref.: 

Page 9 Pages 24-25 

922 930 

Ref.: Ref.: 

Page 10 Pages 24-25 











FIG. 950 


Large Orifice Air Vacuum see pages 24-25 

FIG. 951 


Large Orifice Air Vacuum see pages 24-25 




16-17, 36-37 

Connections: 

Inlet - CL.125 FLG, Standard 

CL.250 FLG, Optional 

Outlet - Cowl, Standard 


Options: 

For Optional CL.125 Outlet, 

specify Figure 950-J or 951-J. 


Air Release and Air Vacuum, 

specify Figure 950-I 951-I. 




KINETIC COMBINATION 

AIR VALVE 

2” through 4” Size, Flanged Inlet, Standard NPT Outlet FIG. 960 

KINETIC PARTS LIST 

FIG. 960 


SIZE 2” 3” 4” 

A 13-1/8” 14-3/4” 15-7/8” 

B 10-5/8” 11-3/8” 13-1/2” 

C 7-5/8” 8-7/8” 11” 

WGT. 

(LBS.) 

70 75 125 


The KINETIC Combination Air Valve shall consist of a KINETIC 

Air & Vacuum Valve and an Air Release Valve housed in a single 

body. The Combination Air Valve shall be designed to exhaust 

large amounts of air during filling, release small amounts of accumulated 

air during operation and open upon impending vacuum 

to admit air while draining. 

The inlet shall be the nominal size of the valve and shall be the 

same size as the outlet. Body and covers shall be of cast iron 

ASTM A126, Class B. The Air & Vacuum portion shall be 

designed to exhaust air at up to sonic velocity without blowing 

shut. The floats shall be spherical stainless steel and capable of 

withstanding a test pressure of 1000 psi. The Air Release portion 

shall have a stainless steel leverage mechanism and shall be 

integral with the Air/Vacuum portion. 

KINETIC Combination Air Valves shall as manufactured by GA 

Industries, Inc., their Figure 960 (formerly Figure GH7K-SO). 







8. COVER NUTS (Air Vacuum) - Steel Grade 2 

12. FLOAT GUIDE - UHMW-PE 

17. COVER (Air Release) - Cast Iron A126 Class B 




22. COVER NUTS (Air Release) - Steel Grade 2 


24. BRACKET CAP SCREW - 18-8 Stainless Steel 



27. ORIFICE BUTTON - 18-8 Stainless Steel/Buna-N 







34. BRACKET LOCKWASHER - 302/304 Stainless Steel 

35. FLOAT BALL (Air Release ) - 316 Stainless Steel 





the buoy ball produces a resultant downward force which 

maintains the ball in the open position. 

2. The buoyant force of the ball will seal the exhaust orifice 

when water reaches the ball. 








CONSULT FACTORY IF OPERATING PRESSURE IS LESS THAN 10 PSI. 






Connections: 

Inlet - CL.125 FLG, Standard; CL.250 FLG, Optional 

Outlet - NPT, Standard; Cowl, Optional; CL.125 FLG, Optional 

Options: 

For Optional Cowl, Specify 960-C 

For Optional CL.125 FLG Outlet, Specify 960-J 


KINETIC COMBINATION 

AIR VALVE 

6” through 16” Size, Flanged Inlet Standard Outlet Cowl FIG. 960 


FIG. 960 (NOTE: Parts 4, 5 & 6 Not Used On 6” & 8” Sizes) 


SIZE 6” 8” 10” 12” 14” 16” 

A 22-5/8” 26-1/4” 30-1/2” 34-1/2” 34-1/2” 40-1/4” 

B 21” 25-1/2” 33” 39-7/8” 39-7/8” 48” 

C 15-1/4” 19” 23-1/2” 27-1/2” 27-1/2” 33-1/2” 

WGT. 

(LBS.) 200 360 500 650 700 900 


The KINETIC Combination Air Valve shall consist of a KINETIC Air & 

Vacuum Valve and an Air Release Valve housed in a single two-piece 

body. The Combination Air Valve shall be designed to exhaust large 

amounts of air during operation and open upon impending vacuum to 

admit air while draining. 

The Inlet shall be the nominal size of the valve and shall be the 

same size as the outlet. Body and covers shall be of cast iron ASTM 

A126, Class B. The Air & Vacuum portion shall be designed to exhaust 

air at up to sonic velocity without blowing shut. The floats shall be 

spherical stainless steel and capable of withstanding a test pressure of 

1000 psi. The Air Release portion shall have a stainless steel leverage 

mechanism and shall be integral with the Air/Vacuum portion. 

KINETIC Combination Air Valves shall as manufactured by GA 

Industries, Inc., their Figure 960 (formerly Figure GH7K). 

1. BODY (Air Vacuum) - Cast Iron A126 Class B 










11. PIPE PLUG - Malleable Iron 





16. ELBOW - Cast Iron A126 Class B 


18. ELBOW BOLTS - Steel Grade 2 















33. FLOAT CAP SCREW - 316 Stainless Steel 





Kinetic 

Operating 

Principle 



















Connections: 


Outlet - Cowl, Standard; CL.125 FLG, Optional 

Options: 





KINETIC HIGH CLOSING 


6” through 16” Size, Flanged Inlet, Standard Outlet Cowl FIG. 961 


FIG. 961 (NOTE: Parts 4, 5 & 6 Not Used On 6” & 8” Sizes) 


SIZE 6” 8” 10” 12” 14” 16” 

A 23” 26-5/8” 30-7/8” 34-7/8” 34-7/8” 40-5/8” 

B 22-3/8” 25-1/2” 33” 39-7/8” 39-7/8” 48” 

C 15-1/4” 19” 23-1/2” 27-1/2” 27-1/2” 33-1/2” 

WGT. 

(LBS.) 210 370 510 660 710 910 


The KINETIC Combination Air Valve shall consist of a KINETIC 

Air & Vacuum Valve and a High Capacity Air Release Valve 

housed in a single two-piece body. The Combination Air Valve 

shall be designed to exhaust large amounts of air during 

filling, release accumulated air during operation, and open upon 


The inlet shall be the nominal size of the valve and shall be the 

same size as the outlet. Body and covers shall be of cast iron 

conforming to ASTM A126, Class B. The Air & Vacuum portion 

shall be designed to exhaust air at up to sonic velocity without 

blowing shut. The floats shall be spherical stainless steel and 

capable of withstanding a test pressure of 1000 psi. The High 

Capacity Air Release portion shall have a stainless steel leverage 

mechanism, and shall be integral with the Air/Vacuum portion. 

KINETIC High Capacity Combination Air Valves shall as 


1. BODY (Air Vacuum) - Cast Iron A126 Class B 














15. COWL WASHER - Steel Grade 2 

16. ELBOW - Cast Iron A126 Class B 


18. ELBOW BOLTS - Steel Grade 2 















33. FLOAT CAP SCREW - 316 Stainless Steel 





Kinetic 

Operating 

Principle 







CL.125 Inlet Body rated to 200 psi WOG; tested to 300 psi 

CL.250 Inlet Body rated to 400 psi WOG; tested to 600 psi 







Figure 961@ 150 psi with 3/8” orifice = 235 SCFM 

Figure 961-H@ 300 psi with 7/32” orifice = 153 SCFM 



Connections: 


Outlet - Cowl, Standard; CL.125 FLG, Optional 

Options: 





Flanged Inlet, 3” through 12” Size FIG. 980/981 

KINETIC 

FIG. 981 

(High Capacity) 


Sizes 6”-12” 

Depicted 

SIZE 3” 4” 6” 8” 10” 12” 

A 14-3/4” 15-7/8” 23” 26-5/8” 30-7/8” 34-7/8” 

B 17-1/2” 20-7/8” 32-1/4” 38-1/8” 48-5/8” 54-1/4” 

C 8-7/8” 11” 15-1/4” 19” 23-1/2” 27-1/2” 

WGT. 110 175 290 505 710 980 

(LBS.) 

NOTE: SIZES 14” & 16” AVAILABLE, CONSULT FACTORY 


Slow-Closing Combination Air Valve shall automatically exhaust large quantities of air 

during filling, release small amounts of accumulated air during operation and allow air to 

re-enter during draining or when negative pressure occurs. Slow-Closing Combination Air 

Valve incorporates a Surge Check to minimize slam and possible damage during closure 

due to the water column. 

Slow-Closing Combination Air Valves shall consist of two independent valves: a 

KINETIC Combination Air Valve mounted on and bolted to a Surge Check Valve. Both 

valves shall be of the same size and pressure ratings and shall be tested as a single unit. 

The Combination Air Valve inlet shall be designed to exhaust air at up to sonic 

velocity without blowing shut. The outlet shall be the same size as the inlet. The 

Air/Vacuum float shall seal against a renewable resilient seat. 

The body and cover shall be constructed of cast iron conforming to ASTM A126, 

Class B. The floats shall be made of stainless steel. 

The Surge Check shall be normally open and be designed to close during the 

transition from air to solid water, reduce the flow of water, slow the closing speed of the 

Air Valve and minimize slam. It shall return to the open position upon closure of the Air 


KINETIC Slow-Closing Combination Air Valve shall be as manufactured by GA 

Industries, Inc., their Figure 980, 981. With optional bypass piping, specify Figure 980-7 

(formerly Figure GH7K-SO/280 - Sizes 3” - 4” and Figure GH7K/280 - sizes 6” - 12”). 


PART PART MATERIALS 

NO. NAME FIG. 980 FIG. 981 

Combination Ref. Fig 960 Ref. Fig. 961 

1. Air Vacuum See Pgs. 49-50 

Valve 

See Page 51 

2. Surge Check 

Valve 

Ref. Fig. 284 

See Page 34 

3. Bolts Steel ASTM A307 

4. Nuts Steel ASTM A307 

5. Gasket Fibre Rubber 




around the buoy ball produces a resultant 

downward force which maintains the ball in the 

open position. 




Working Pressure*: 


FIG. 980 

Combination Air Vacuum Valve, See Page 50 

Surge Check Valve, See Page 34 

FIG. 981 

Combination Air Vacuum Valve, See Page 51 

Surge Check Valve, See Page 34 

*CONSULT FACTORY IF OPERATING 



16-17, 36-37. OTHER ORIFICES AVAILABLE; 


Connections: 


CL. 250 FLG, Optional 

Outlet - NPT, Standard, 3” & 4” 

Cowl, Standard, 6” - 12” 


Cowl, Optional, 3” & 4” 

Options: 

For Optional Outlet Cowl, Sizes 3” - 4” 

Specify Figure 980-C or 981-C 

For Optional CL.125, Outlet, Sizes 3” - 12” 

Specify Figure 980-J or 981-J 


Specify Figure 980-7 or 981-7 




KINETIC SLOW-CLOSING CUSTOM 


Flanged Inlet, 3” through 12” Size FIG. 983/984/985 

CUSTOM KINETIC 


SIZE 3” 4” 6” 8” 10” 12” 

A 12-1/4ʼ” 14-1/4ʼ” 21-5/8” 25-3/8” 29-7/8” 33-7/8” 

B 22-1/4” 23-1/8” 30-3/8” 37-7/8” 48-5/8” 54-1/4” 

C 6-5/8” 9” 15-1/4” 19” 23-1/2” 27-1/2” 

WGT. 

(LBS.) 95 145 290 505 710 980 

NOTE: SIZES 14” & 16” AVAILABLE, CONSULT FACTORY 


Slow-Closing Combination Air Valve shall automatically exhaust large quantities of air 

during filling, release small amounts of accumulated air during operation and allow air to 

re-enter during draining or when negative pressure occurs. Slow-Closing Combination Air 

Valve incorporates a Surge Check to minimize slam and possible damage during closure 

due to the water column. 

CUSTOM Slow-Closing Combination Air Valves shall consist of two independent 

valves: a KINETIC Combination Air & Vacuum Valve and an Air Release Valve, piped 

together and mounted on and bolted to a Surge Check Valve. The Air & Vacuum and 

Surge Check Valves shall be of the same size and pressure rating and the assembly 

shall be tested as a single unit. 

The KINETIC Air & Vacuum Valve shall be designed to exhaust air at up to sonic 

velocity without blowing shut. The outlet shall be the same size as the inlet. The float 

shall be the only moving part and shall seal against renewable resilient seat. The body 

and cover shall be constructed of cast iron conforming to ASTM A126, Class B. The float 

shall be made of spherical stainless steel. 

The Air Release Valve shall be of the adequate size and pressure rating to release 

small amounts of air under pressure. Its body and cover shall be of cast iron conforming 

to ASTM A126, Class B, internal trim shall be stainless steel. 

The Surge Check shall be normally open and be designed to close during the transition 

from air to solid water, reduce the flow of water, slow the closing speed of the Air 

Valve and minimize slam. It shall return to the open position upon closure of the Air 


CUSTOM Slow-Closing Combination Air Valve shall be as manufactured by GA 

Industries, Inc., their Figure 983, 984 or 985 as required. With optional bypass piping, 

specify Figure 983-I7, 984-I7 or 985-I7 (formerly Figure AR/GH21-SO/280 - Sizes 3” - 4” 

and Figure AR/GH21K/280 - sizes 6” - 12”). 

PARTS LIST 

Combination Air Release Air Vacuum Surge Check 

Figure Size Valve Valve Figure 

No. Figure No. Figure No. No. 



983 

1/2”-4” 905 (P.6) 930 (P.23) 

6”-12” 920 (P.9) 930 (24-25) 

284 (P.34) 

984 

1/2”-4” 910 (P.7) 930 (P.23) 

284 (P.34) 

6”-12” 922 (P.10) 930 (24-25) 

985 1/2”-4” 912 (P.8) 930 (P.23) 284 (P.34) 



around the buoy ball produces a resultant 

downward force which maintains the ball in the 

open position. 




Working Pressure*: 





*CONSULT FACTORY IF OPERATING 


Connections: 



Outlet - NPT, Standard, 3” & 4” 

Cowl, Standard, 6” - 12” 


Cowl, Optional, 3” & 4” 

Options: 


Specify Figure 983-C, 984-C or 985-C 


Specify Figure 983-7, 984-7 or 985-7 


Air Release and Air Vacuum Valve, 

Specify Figure 983-I, 984-I or 985-I 

For Optional Flanged Outlet, 

Specify Figure 983-J, 984-J or 985-J 


Specify Figure 983-C, 984-C or 985-C 

REFER TO CROSS REFERENCES 

IN PARTS LIST ABOVE.

SINGLE BODY SEWAGE SERVICE 


2” through 6” Inlet and NPT Outlet FIG. 942 

DUO-MATIC PARTS LIST 

FIG. 942 



*For 4” 

Size Only 

SIZE 2” X 1” 2” X 2” 3” X 2” 3” X 3” 4” 6” 

A 

(SQ.) 6-1/2” 6-1/2” 6-1/2” 9-1/2” 9-1/2” 13-1/2” 

B 20-1/2” 20-1/2” 20-1/2” 23-1/2” 25-1/2” 29” 

WGT. 

(LBS.) 60 60 60 170 190 320 

8”, 10”, 12” - (Manifolded 6” Valves) Also Available 

CONSULT FACTORY FOR DETAILS 

The Combination Air Valve shall be designed to exhaust large amounts 

of air during filling, to release small amounts of accumulated air during 

operation and to admit large amount of air upon impending vacuum during 

draining. 

The valve shall be float operated and both the Air & Vacuum and Air 

Release functions shall be housed in a single body. Body and cover shall 

be of cast iron conforming to ASTM A126, Class B. All leverage mechanism 

parts and the spherical float shall be stainless steel. The large and 

small orifice seats shall be Buna-N and shall be renewable. 

When specified, the Combination Air Valve shall be supplied with 

“Flushing Attachments” to allow periodic flushing of sediment, grease and 

solids. Attachments consist of: an inlet isolating valve, bronze blow-off and 

flushing valves and a minimum of 5 feet of rubber hose with quick-disconnects 

to allow connection to a clean water source. 

Combination Air Valves shall be as manufactured by GA Industries, Inc., 

their Figure 942 (formerly Figure SCAVE). 



3. CAGE -Ductile Iron A536, Grade 65-45-12 







10. UPPER PLUG EXTENSION- 316 Stainless Steel 

11. LOWER PLUG EXTENSION- 316 Stainless Steel 











22. FLOAT BALL SCREW - 316 Stainless Steel 





27. CAGE BOLTS - 18-8 Stainless Steel 


29. CLOSE NIPPLE - Steel (Commercial) 

30. COMPANION FLANGE - Cast Iron A126 Class B 



Body rated to 200 psi WOG; tested to 300 psi 



10-150 psi with 1/8” orifice, 2” x 1” through 3” x 2” size 

10-150 psi with 3/16” orifice, 3” x 3” through 4” size 

10-150 psi with 5/16” orifice, 6” size 




@ 150 psi with 1/8” orifice @ 26.1 SCFM, 

2” x 1” through 3” x 2” size 

@ 150 psi with 3/16” orifice @ 58.7 SCFM, 

3” x 3” through 4” size 

@ 150 psi with 5/16” orifice @ 163 SCFM, 6” size 



Connections: 

Inlet - NPT, Standard, 2” x 1” - 3” x 3” 

CL.125 FLG, Standard, 4” & 6” 



Options: 

For Optional Flanged Outlet, specify 942-J 

For Optional Flushing Attachments, 

specify 942-F, see Pg. 15 


1. Peaks 






7. Pumps 





STANDARD CUSTOM SEWAGE 


2” - 3” NPT Inlet and NPT Outlet FIG. 955 

CONVENTIONAL SEWAGE COMBINATION AIR VALVE 

FIG. 925 

Air Release Valve 

Ref.: Pg. 12 

FIG. 955 


Isolating Valve 

FIG. 935 


Ref.: Pg. 30 

The Custom Sewage Combination Air Valve shall be designed to exhaust 

large amounts of air during filling, release small amounts of accumulated air during 

operation and open upon impending vacuum to admit large amount of air 

while draining. 

The Custom Sewage Combination Air Valve shall consist of two independent 

valves: a large orifice Air & Vacuum valve and a small orifice Air Release Valve, 

piped together so that a single, common connection can be made to the force 

main. The assembly shall be complete with shut-off valves to allow each valve to 

be isolated from the line. The assembly shall be tested as a unit to insure there 

are no leaking joints. 

The Air & Vacuum Valve shall be equal in all respects to GA Industries Fig. 

935 and shall be of the size specified. The Air Release Valve shall be equal in 

all respects to GA Industries Fig. 925 and shall be 2” NPT size. All internal metal 

trim components shall be stainless steel. 

When specified, the Combination Air Valve shall be supplied with “Flushing 

Attachments” to allow periodic flushing of sediment, grease and solids. 

Attachments consist of: bronze blow-off and flushing valves, with a minimum of 

5 feet of rubber hose, and quick-disconnects to allow connection to a clean 

water source. 

GA Industries, Inc., their Figure 955 (formerly Figure SCAV-3 or SCAV-5). 


SIZE 2” X 1” 2” X 2” 3” X 2” 3” X 3” 

A 28” 28” 36-1/2” 38” 

B 25-3/4” 25-3/4” 27-1/2” 30-1/2” 

C 6-3/8” 6-3/8” 6-3/8” 9-1/2” 

INLET 2” NPT 2” NPT 3” NPT 3” NPT 

OUTLET 1” NPT 2” NPT 2” NPT 3” NPT 

WGT. 

(LBS.) 

150 150 180 310 



NPT Inlet Body rated to 200 psi 

WOG, tested to 300 psi. 




(Optional-Fig. 955-L) 



CONSULT FACTORY IF 

OPERATING PRESSURE IS 

LESS THAN 10 PSI. 



Fig. 955-L 

@ 75 psi with 5/16” orifice = 

88.8 SCFM 

Fig. 955 


58.7 SCFM 


SEE PAGES 16-17, 36-37. 

OTHER ORIFICES AVAILABLE; 


Connections: 



Options: 


specify 955-F, see Pg. 15 


1. Peaks 






7. Pumps 


Cylinders and Piping Loops 


STANDARD CUSTOM SEWAGE 


4” and 6” Size Flanged Inlet FIG. 955 

CONVENTIONAL SEWAGE COMBINATION AIR VALVE 

Figure 925 


Ref.: Page 12 

FIG. 955 



Figure 935 


Ref.: Page 30 

The Custom Sewage Combination Air Valve shall be designed to exhaust large 

amounts of air during filling, release small amounts of accumulated air during operation 

and open upon impending vacuum to admit large amount of air while draining. 

The Custom Sewage Combination Air Valve shall consist of two independent 

valves: a large orifice Air & Vacuum Valve and a small orifice Air Release Valve, 

piped together so that a single, common connection can be made to the force 

main. The assembly shall be complete with shut-off valves to allow each valve to 

be isolated from the line. The assembly shall be tested as a unit to insure there are 

no leaking joints. 

The Air & Vacuum Valve shall be equal in all respects to GA Industries Fig.935 

and shall be of the size specified. The Air Release Valve shall be equal in all 

respects to GA Industries Fig. 925 and shall be 2” NPT size. All internal metal trim 

components shall be stainless steel. 


Attachments” to allow periodic flushing of sediment, grease and solids. Attachments 

consist of: bronze blow-off and flushing valves, with a minimum of 5 feet of rubber 

hose, and quick-disconnects to allow connection to a clean water source. 

GA Industries, Inc., their Figure 955 (formerly Figure SCAV-3, or SCAV-5). 


SIZE 4” 6” 

A 23-3/4” 26-1/2” 

B 25-3/4” 31-1/4” 

C 9-1/2” 13-1/2” 

WGT. 

(LBS) 320 450 



NPT Inlet Body rated to 200 psi 

WOG, tested to 300 psi. 












Fig. 955-L 


88.8 SCFM 

Fig. 955 


58.7 SCFM 


SEE PAGES 16-17, 36-37. 



Connections: 

Inlet - CL. 125 FLG Standard 



Options: 

For Optional Outlet Flange, 



specify 955-F, see Pg.15. 


1. Peaks 






7. Pumps 






CUSTOM HIGH-CAPACITY 

SEWAGE COMBINATION AIR VALVE 

4” and 6” Size Flanged Inlet FIG. 957 

CONVENTIONAL SEWAGE COMBINATION AIR VALVE GENERAL DIMENSIONS 

Figure 927 


Ref.: Page 13 

FIG. 957 



Figure 935 


Ref.: Page 30 

The Custom Sewage Combination Air Valve shall be designed to exhaust large amounts 

of air during filling, release small amounts of accumulated air during operation and open 

upon impending vacuum to admit air while draining. 

The Custom Sewage Combination Air Valve shall consist of two independent valves: 

a large orifice Air & Vacuum Valve and a small orifice Air Release Valve, piped together so 

that a single, common connection can be made to the force main. The assembly shall be 

complete with shut-off valves to allow each valve to be isolated from the line. The assembly 

shall be tested as a unit to insure there are no leaking joints. 

The Air & Vacuum Valve shall be equal in all respects to GA Industries Fig. 935 and 

shall be of the size specified. The Air Release Valve shall be equal in all respects to GA 

Industries Fig. 927 and shall be 2” NPT size. All internal metal trim components shall be 

stainless steel. 



consist of: a lugged butterfly isolating valve, and bronze blow-off and flushing valves, 

with a minimum of 5 feet of rubber hose, and quick-disconnects to allow connection 

to a clean water source. 

The Custom Sewage Combination Air Valves shall be as manufactured by 

GA Industries, Inc., their Figure 957 (formerly Figure SCAV-7, or SCAV-8). 

SIZE 4” 6” 

A 23-3/4” 26-1/2” 

B 27-3/4” 33-1/4” 

C 9-1/2” 13-1/2” 

WGT. 

(LBS) 325 455 



CL. 125 FLG Inlet Body rated to 

200 psi WOG; tested to 300 psi 












Fig. 957-L 


227.3 SCFM 

Fig. 957 


319.5 SCFM 


SEE PAGES 16-17, 36-37. 



Connections: 

Inlet - CL. 125 FLG Standard 



Options: 

For Optional Outlet Flange, 



specify 957-F, see Pg. 15. 


1. Peaks 






7. Pumps 




CUSTOM SHORT BODY 

SEWAGE COMBINATION AIR VALVE 

2” through 3” Size, NPT Inlet FIG. 959 

SHORT BODY SEWAGE COMBINATION AIR VALVE 

Figure 939 


(Page 31) 

FIG. 959 

NOTE: Use Only Where 

Space Does Not Permit 

Installation of Standard 

Height Valves. 




SIZE 2” x 1” 2” x 2” 3” x 2” 

A 28” 28” 36-1/2” 

B 17-1/4” 17-1/4” 19” 

C 6-3/8” 6-3/8” 6-3/8” 

INLET 2” NPT 2” NPT 3” NPT 

OUTLET 1” NPT 2” NPT 2” NPT 

WEIGHT 110 110 140 

(LBS.) 

The Custom Short Body Sewage Combination Air Valve shall be designed to 

exhaust large amounts of air during filling, release small amounts of accumulated 

air during operation and open upon impending vacuum to admit air while draining. 

The Short Body Custom Sewage Combination Air Valve shall consist of two 

independent valves: a large orifice Air & Vacuum Valve and a small orifice Air 

Release Valve, piped together so that a single, common connection can be made 

to the force main. The assembly shall be complete with shut-off valves to allow 

each valve to be isolated from the line. The assembly shall be tested as a unit to 

insure there are no leaking joints. Maximum height of the 2” x 1” or 2” x 2” assembly 

shall be 17-1/4”, 3” x 2” assembly 19”, including flush attachments if specified. 

The Air & Vacuum Valve shall be equal in all respects to GA Industries Fig. 939 

and shall be of the size specified. The Air Release Valve shall be equal in all 

respects to GA Industries Fig. 929 and shall be 2” NPT size. All internal metal trim 

components shall be stainless steel. 



consist of : bronze blow-off and flushing valves, with a minimum of 5 feet of rubber 

hose, and quick-disconnects to allow connection to a clean water source. 

The Custom Short Body Sewage Combination Air Valve shall be as 

manufactured by GA Industries, Inc., their Figure 959 (formerly Figure SCAV-S-3, 

or SCAV-S-5). 


Figure 929 


(Page 14) 


NPT Inlet Body rated to 200 psi WOG, 












8.88 SCFM 


58.7 SCFM 




Connections: 



Options: 


specify 959-F, see page 15. 


1. Peaks 






7. Pumps 


A Product GA Industries Page 58 



COMBINATION VACUUM RELIEF 

& AIR RELEASE VALVE 

Sizes 2-1/2” through 12” Flanged Inlet - For Clean Fluids Only FIG. 992 

COMBINATION APPLICATION DATA 

FIG. 992 


FOR PARTS LIST 

SEE PGS. 9 & 32 

SIZES 2-1/2” - 12” 

SIZE 2-1/2” 3” 4” 6” 8” 10” 12” 

A 18” 18” 20” 22” 24” 28” 30” 

B 14-3/4” 15” 15-3/4” 17” 18-1/2” 23-1/4” 23” 

C 8” 8” 10” 12” 14” 18” 20” 

WGT. 62 68 86 115 175 245 380 

(LBS.) 


The Combination Vacuum Breaking and Air Release Valve shall open to 

admit large amounts of air when the pressure in the pipeline or vessel falls 

below atmospheric, reclose upon restoration of positive pressure and release 

small amounts of accumulated air while pressurized. The Combination Valve 

shall consist of two independent valves; a Vacuum Breaking Valve and an Air 

Release Valve, piped together and tested as a unit. Rapid entry of air into the 

valve shall be accomplished by having 10% more inflow area than the equivalent 

size of the valve. 

The Vacuum Relief Valve shall be normally closed and open only when the 

pressure in the pipeline or vessel falls to approximately 1/4 psi below atmospheric 

pressure. The body of the valve shall be constructed of cast iron conforming 

to ASTM A126, Class B. The disc and seat ring shall be made of 

bronze conforming to ASTM B62. Tight shut-off shall be provided by a metal 

seat with a resilient seal. Internal spring shall be stainless steel. The air inlet 

shall be protected by a stainless steel screen and steel hood to prevent the 

entry of foreign materials. 

The Air Release Valve shall be of adequate size to release small amounts of 

accumulated air at up to the maximum working pressure of the system. It shall 

have a cast iron body and cover conforming to ASTM A126, Class B, all stainless 

steel internal trim and float and a rubber seat for tight shutoff. 

The Combination Vacuum Breaking and Air Release Valve shall be as 


Why Use Vacuum Relief Valves? 

Most often, pressure containing systems, such as pipelines, 

filter canisters or tanks, are designed to withstand many times 

the normal pressure without damage. However, certain 

pipelines and pressure vessels are easily damaged when subjected 

to an internal vacuum caused by the closed system. In 

particular, thin wall large diameter pipe and vessels are susceptible 

to damage caused by vacuum conditions beyond their 

design. It is extremely important that these systems be protected 

by “relieving” the vacuum before it reached a critical point. 

NOTE: This valve has been effective in installations where water column 

separations occur following a pump trip, minimizing subsequent 

high shock pressures when the columns rejoin. It freely 

admits air, but vents it slowly through the Air Release Valve, thereby 

providing a cushion of air to reduce the impact of the rejoining water 

columns, thus lessening the surge potential of the system. However, 

it is not suitable to vent air when filling pipeline. 


Vacuum Relief Valves automatically open and admit air into 

a pipeline, vessel or system, when the internal pressure drops 

to a predetermined level below atmospheric, thereby “makingup” 

the vacuum and limiting the vacuum pressure to within the 

design of the system. 


Vacuum Relief Valves are installed at points where a vacuum 

would first tend to form if the system would drain, either by 

design or in an emergency, such as line break or power outage. 

They are normally held closed by a spring or weight and 

do not open unless the internal pressure drops below atmospheric. 

When the pressure inside the pipeline or vessel drops 

to a point where the external atmospheric pressure overcomes 

the spring or weight, the valve opens and rapidly admits air. 

The valve will re-close upon restoration of pressure higher than 

the setting of the valve. Vacuum Relief Valves can be combined 

with Air Release Valves to allow residual air to escape 

after the Vacuum Relief valve has re-closed. 


Figure 993 Vacuum Relief Valves are used on water systems 

where it is necessary to prevent critical vacuum formation. 

They are sometimes used in conjunction with Air/Vacuum 

Valves to supplement the Air/Vacuum Valveʼs inflow. This is 

particularly critical when there is a wide difference in the filling 

and draining flow rates, such as on a steep pipeline gradient, 

or when thin-wall, large diameter steel pipe is used. 

What Is The Difference Between Vacuum 

Relief Valves and Air/Vacuum Valves? 

Vacuum Relief Valves are NORMALLY CLOSED and are 

ONE-WAY valves. They open only upon excessive vacuum to 

admit large amounts of air into the system to prevent a critical 

vacuum condition. Once internal pressure returns to the setting 

of the valve, it closes and air in the system cannot escape 

through it. Air that had been drawn in through the Vacuum 

Relief Valves must be exhausted by other means. 

Kinetic Air/Vacuum Valves are NORMALLY OPEN and are 

TWO-WAY valves. They exhaust air from AND admit air into a 

pipeline or system. The valve is always open when it is not 

filled with liquid and held shut by positive pressure in the 

system. When system pressure drops to near atmospheric 

(impending vacuum) it opens and admits air. However, as liquid 

refills the system, air that had been drawn in can also be 

exhausted through the Air/Vacuum Valve. 


COMBINATION VACUUM RELIEF 

& AIR RELEASE VALVE 

Sizes 3” through 12” Flanged Inlet - 

For Sewage & Wastewater Service 

COMBINATION 

FIG. 993 


FOR PARTS LIST 

SEE PGS. 14 & 33 

SIZES 3” - 12” 

SIZE 3” 4” 6” 8” 10” 12” 

A 20-1/2” 22” 23-3/4” 27-1/4” 30-1/4” 34” 

B 27-1/2” 28-1/2” 33” 33” 37” 43” 

C 15” 16” 19” 22” 24” 28” 

WGT. 

(LBS.) 

160 205 285 405 600 875 


The Sewage and Wastewater Service Combination Vacuum Breaking and Air 

Release Valve shall open to admit large amounts of air when the pressure in the 

pipeline or vessel falls below atmospheric, reclose upon restoration of positive pressure 

and release small amounts of accumulated air while pressurized. The 

Combination Valve shall consist of two independent valves; a Vacuum Breaking Valve 

and an Air Release Valve, piped together and tested as a unit. 

The Vacuum Relief Valve shall be normally closed and open only when the 

pressure in the pipeline or vessel falls below a predetermined, adjustable vacuum 

pressure. The body of the valve shall be constructed of cast iron conforming to ASTM 

A126, Class B. The disc and seat ring shall be made of bronze conforming to ASTM 

B62. The disc shall be rubber faced designed for tight shut-off. The seat ring shall be 

bronze. There shall be no internal springs. The air inlet shall be protected by a stainless 

steel screen and steel hood to prevent the entry of foreign materials. 

The Air Release Valve shall 2” size, suitable to release small amounts of 

accumulated air at up to the maximum working pressure of the system. It shall have 

a cast iron body and cover conforming to ASTM A126, Class B, all stainless steel 

internal trim and float and a rubber seat for tight shutoff. An isolating valve shall be 

supplied between the Vacuum Breaking Valve and the Air Release Valve. 

The Sewage Service Combination Vacuum Breaking and Air Release Valve 

shall be as manufactured by GA Industries, Inc., their Figure 993 ( formerly Figure 

HCARV). 

APPLICATION DATA 

FIG. 993 

Why Use Vacuum Relief Valves? 

Most often, pressure containing systems, such as pipelines, 

filter canisters or tanks, are designed to withstand many times 

the normal pressure without damage. However, certain 

pipelines and pressure vessels are easily damaged when subjected 

to an internal vacuum caused by the closed system. In 

particular, thin wall large diameter pipe and vessels are susceptible 

to damage caused by vacuum conditions beyond their 

design. It is extremely important that these systems be protected 

by “relieving” the vacuum before it reached a critical point. 

NOTE: This valve has been effective in installations where water 

column separations occur following a pump trip, minimizing subsequent 

high shock pressures when the columns rejoin. It freely 

admits air, but vents it slowly through the Air Release Valve, thereby 

providing a cushion of air to reduce the impact of the rejoining water 

columns, thus lessening the surge potential of the system. However, 

it is not suitable to vent air when filling pipeline. 


Vacuum Relief Valves automatically open and admit air into 

a pipeline, vessel or system, when the internal pressure drops 

to a predetermined level below atmospheric, thereby “makingup” 

the vacuum and limiting the vacuum pressure to within the 

design of the system. 


Vacuum Relief Valves are installed at points where a vacuum 

would first tend to form if the system would drain, either by 

design or in an emergency, such as line break or power outage. 

They are normally held closed by a spring or weight and 

do not open unless the internal pressure drops below atmospheric. 

When the pressure inside the pipeline or vessel drops 

to a point where the external atmospheric pressure overcomes 

the spring or weight, the valve opens and rapidly admits air. 

The valve will re-close upon restoration of pressure higher than 

the setting of the valve. Vacuum Relief Valves can be combined 

with Air Release Valves to allow residual air to escape 

after the Vacuum Relief valve has re-closed. 


Figure 993 Vacuum Relief Valves are used on water systems 

where it is necessary to prevent critical vacuum formation. 

They are sometimes used in conjunction with Air/Vacuum 

Valves to supplement the Air/Vacuum Valveʼs inflow. This is 

particularly critical when there is a wide difference in the filling 

and draining flow rates, such as on a steep pipeline gradient, 

or when thin-wall, large diameter steel pipe is used. 

What Is The Difference Between Vacuum 

Relief Valves and Air/Vacuum Valves? 

Vacuum Relief Valves are NORMALLY CLOSED and are 

ONE-WAY valves. They open only upon excessive vacuum to 

admit large amounts of air into the system to prevent a critical 

vacuum condition. Once internal pressure returns to the setting 

of the valve, it closes and air in the system cannot escape 

through it. Air that had been drawn in through the Vacuum 

Relief Valves must be exhausted by other means. 

Kinetic Air/Vacuum Valves are NORMALLY OPEN and are 

TWO-WAY valves. They exhaust air from AND admit air into a 

pipeline or system. The valve is always open when it is not 

filled with liquid and held shut by positive pressure in the 

system. When system pressure drops to near atmospheric 

(impending vacuum) it opens and admits air. However, as liquid 

refills the system, air that had been drawn in can also be 

exhausted through the Air/Vacuum Valve. 



BASIC PRINCIPLE OF BERNOULLIʼS THEORY 

Pressure 

“P” Head “V” 

KINETIC AIR VALVES 

(They Really Are Something Special) 

“Z” “C” 

+ Velocity + Elevation = 

Head 

Head 

Constant 

THE VALVE 

The “KINETIC” form of air valve for water mains overcomes the risk, and subsequent 

inconveniences, of orthodox large orifice air valve balls being suddenly 

caught up in the escaping air stream and closing the valve during the filling of 

water mains at high rates. In the “KINETIC” valve, this difficulty is obviated by 

controlling the movement of the valve ball in such a way that the valve cannot be 

blown shut prematurely by discharging air, or even by a mixture of air and water 

spray, however high the emergent air velocity, but is positively closed by rising 

solid water. 

THE DEVELOPMENT 

In the development of the “KINETIC” valve, hydro-dynamic principles have been 

applied to produce the novel feature through which the ball-sealed orifice always 

remains open while air is exhausting, and is immediately closed when solid water 

rises in the valve to lift the ball and seal the orifice. 

Conventional large orifice air valves usually have cages or pockets, sheltered 

from escaping air, for the ball to drop into when the valve is open. From experience, 

however, it has been found that turbulent air can circulate in such cavities, 

and cause the ball to be thrown into the discharging air stream, thus blowing the 

valve shut. As only slight pressure will hold the ball against the orifice, the valve is 

liable to remain closed until the ball is manually forced off the orifice. 

THE THEORY 

When fluid escapes through an orifice in a plate with a disk placed closely over 

the orifice it issues on all sides in a radiating film but does not displace the disk. A 

similar phenomenon is produced when the plate and disk are replaced by a cone 

and ball. 

The principle of this action can be easily shown, using a table tennis ball and a 

small funnel. If the ball is placed in the funnel and air is blown through the stem 

the ball will remain poised in the neck. And if the funnel is inverted and air Is 

blown down the stem, the ball will be supported by the air flow against gravitational 

pull. 

The forces acting on the ball, independent of gravitational forces, are the impact 

of the air stream, acting over an area equal to that of the pipe section and tending 

to blow it away, and suction force acting over a large annular area and tending to 

hold it in place. Therefore if the impact force is less than the suction force the ball 

will be held down, and if the opposite condition exists the ball will be blown out. 

THE DESIGN 

For practical purposes, since the diameter of ball which will be blown off by air 

can be ascertained and a larger ball will be displaced by water than by air, it is 

possible to determine the ratio of ball size to stream size that will result in the ball, 

being blown out by a stream of water, but held down by a stream of air. From 

laboratory investigations the ratio, which, together with a convenient angle of 

cone, conforms to this principle has been obtained and embodied in the design 

of the “KINETIC” Air Valve. 

Although the foregoing applies in principle to an open cone and ball, only minor 

modifications - including the provision of suitable limit stops to prevent the ball 

blocking inflow by falling into the bottom of the cone, and thus impairing the function 

of a large orifice Air Relief Valve to induce as well as exhaust air - are needed 

when a ball is contained in a housing with an orificed cover. With this arrangement, 

the impinging air stream creates a greater suction force, which causes a 

downward pressure on the ball, that increases as the emergent air velocity 

increases. Consequently, air at any velocity, even its critical velocity, can be 

discharged without the possibility of the valve blowing shut prematurely. 

ADHERENT DISK 

CONE & BALL 


TABLE OF WATER HEADS AND EQUIVALENT PRESSURES 

(TO ESTIMATE ANY PRESSURE MULTIPLY THE HEAD (IN FEET) BY .433. THE RESULT IS LBS. PER SQUARE INCH.) 

METRIC CONVERSION TABLE 

ADDITIONAL FLUID POWER FORMULAE 

Table of Metric Conversions 

and Other Fluid Power Formulae 

Head Pressure Head Pressure Head Pressure Head Pressure 

(in feet) (lbs. per sq in.) (in feet) (lbs. per sq in.) (in feet) (lbs. per sq in.) (in feet) (lbs. per sq in.) 

5 2.17 80 34.6 275 119 700 303 

10 4.33 90 39.0 300 130 750 325 

15 6.50 100 43.3 350 152 800 346 

20 8.66 125 54.1 400 173 850 368 

30 13.0 150 65.0 450 195 900 390 

40 17.3 175 75.8 500 217 950 411 

50 21.7 200 86.6 550 238 1000 433 

60 26.0 225 97.4 600 260 1100 476 

70 30.3 250 108 650 281 1200 520 

Millimeters x .03937 = inches 

Millimeters / 25.4 = inches 

Centimeters x .3937 = inches 

Centimeters / 2.54 = inches 

Meters x 39.37 = inches (Act of Congress) 

Meters x 3.281 = feet 

Meters x 1.094 = yards 

Kilometers x .6214 = miles 

Kilometers / 1.6093 = miles 

Kilometers x 3280.99 = feet 

Square Millimeters x .00155 = sq. inches 

Square Millimeters / 645.2 = sq. inches 

Square Centimeters x .155 = sq. inches 

Square Centimeters / 6.452 = sq. inches 

Square Meters x 10.765 = sq. feet 

Square Kilometers x 247.1 = acres 

Hectare x 2.471 = acres 

1 Cu. ft. water weighs 62.4 lbs. 

1 Bar at sea level: 

= 14.504 PSI 

= 0.98692 atmosphere 

= 33.5 foot water column 

Pascals x 6895 = PSI 

PSI / 1.45 x 10 -4 = Pascals 

Approx. 1/2 PSI decrease each 1000 

foot of elevation 

1” Hg = 0.4912 PSI 

=1.135 ft. water 

1 PSI = 2.036” Hg 

= 27.71” water 

= 0.0689 bar 

1 Atmosphere = 1.013 bars 

= 29.921” Hg 

= 14.696 PSI 

= 760 mm Hg 

Cubic Centimeters / 16.387 = cu. inches 

Cubic Centimeters / 3.70 = fl. drams (U.S.P.) 

Cubic Centimeters / 29.57 = fl. oz. (U.S.P.) 

Cubic Meters x 35.315 = cubic feet 

Cubic Meters x 1.308 = cubic yards 

Cubic Meters x 264.2 = gallons (231 cu.in.) 

Liters x 61.022 = cu. in. (Act of Congress) 

Liters x 33.84 = fluid ounces (U.S.P.) 

Liters x .2642 = gallons (231 cu.in.) 

Liters / 3.78 = gallons (231 cu.in.) 

Liters / 28.316 = cubic feet 

Hectoliters x 3.531 = cubic feet 

Hectoliters x .131 = cubic yards 

Hectoliters x 26.42 = gallons (231 cu.in.) 

Grams x 15.432 = grains (Act of Congress) 

Grams / 981 = dynes 

Grams / 28.35 = ounces avoirdupois 

Velocity of flow in pipe: 

V = GPM x 0.3208 / A 

V is fluid velocity in feet per second; 

GPM is flow in gallons per minute; A is 

inside area of pipe in square inches 

Charlesʼ Law for behavior of gases: 

T1V2 = T2V1 or T1P2 - T2P1 

T1, P1 and V1 are initial temperature, 

pressure and volume; and T2, P2 and V2 

are final conditions 

Boyleʼs Law for behavior of gases: 

P1V1 = P2V2 

P1 and V1 are initial pressure and volume; 

P2 and V2 are final conditions 

Grams per cu. cent / 27.7 = 

lbs. per cu.in. 

Joule x .7376 = foot pounds 

Kilograms x 2.205 = pounds 

Kilograms x 35.3 = oz. avoirdupois 

Kilograms/ 907 = tons (2,000 lbs.) 

Kilograms per sq. cent. x 14.223 = 

lbs. per square inch 

Kilogram-meter x 7.234 = foot pounds 

Kilograms per meter x .672 = lbs. per foot 

Kilog. per cu. meter x .062 = lbs. per cu. ft. 

Kilowatts x 1.34 = Horse power 

Watts / 746 = Horse power 

Watts x .7378 = foot pounds per second 

(Centigrade x 1.8) + 32 = degrees Fahr. 

Hydraulic cylinder piston travel speed: 

S = CIM / A 

CIM is oil flow into cylinder, cubic 

inches per minute; A is piston area in 

square inches. 

Thrust or force of any cylinder: 

T = A x PSI 

T is thrust or force in pounds; A is 

piston net area in square inches; PSI 

is gauge pressure. 

Burst pressure of pipe or tubing: 

P = 2t x S / O 

P is burst pressure in PSI; t is wall 

thickness in inches; S is tensile 

strength of material in PSI; O is 

outside diameter, in inches. 

A Product of GA Industries Page 62

AREAS & CIRCUMFERENCES OF CIRCLES 

DIA. CIRCUM. AREA DIA. CIRCUM. AREA DIA. CIRCUM. AREA DIA. CIRCUM. AREA 

1/64 .04909 .00019 

1/32 .09818 .00077 

3/64 .14726 .00173 

1/16 .19635 .00307 

5/64 .24544 .00479 

3/32 .29452 .00690 

7/64 .34361 .00940 

1/8 .39270 .01227 

9/64 .44179 .01553 

5/32 .49087 .01917 

11/64 .53996 .02320 

3/16 .58905 .02761 

13/64 .63814 .03241 

7/32 .68722 .03758 

15/64 .73631 .04314 

1/4 .78540 .04909 

17/64 .83449 .05542 

9/32 .88357 .06213 

19/64 .93266 .06922 

5/16 .98175 .07670 

21/64 1.0308 .08456 

11/32 1.0799 .09281 

23/64 1.1290 .10143 

3/8 1.1781 .11045 

25/64 1.2272 .11984 

13/32 1.2763 .12962 

27/64 1.3254 .13978 

7/16 1.3744 .15033 

29/64 1.4235 .16126 

15/32 1.4726 .17257 

31/64 1.5217 .18427 

1/2 1.5708 .19635 

17/32 1.6690 .22166 

9/16 1.7671 .24850 

19/32 1.8653 .27688 

5/8 1.9635 .30680 

21/32 2.0617 .33824 

11/16 2.1598 .37122 

23/32 2.2580 .40574 

3/4 2.3562 .44179 

25/32 2.4544 .47937 

13/16 2.5525 .51849 

27/32 2.6507 .55914 

7/8 2.7489 .60132 

29/32 2.8471 .64504 

15/16 2.9452 .69029 

31/32 3.0434 .73708 

1 3.1416 .7854 

1/16 3.3379 .8866 

1/8 3.5343 .9940 

3/16 3.7306 1.1075 

1/4 3.9270 1.2272 

5/16 4.1233 1.3530 

3/8 4.3197 1.4849 

7/16 4.5160 1.6230 

1/2 4.7124 1.7671 

9/16 4.9087 1.9175 

1 5/8 5.1051 2.0739 

11/16 5.3014 2.2365 

3/4 5.4978 2.4053 

13/16 5.6941 2.5802 

7/8 5.8905 2.7612 

15/16 6.0868 2.9483 

2 6.2832 3.1416 

1/16 6.4795 3.3410 

1/8 6.6759 3.5466 

3/16 6.8722 3.7583 

1/4 7.0686 3.9761 

5/16 7.2649 4.2000 

3/8 7.4613 4.4301 

7/16 7.6576 4.6664 

1/2 7.8540 4.9087 

9/16 8.0503 5.1572 

5/8 8.2467 5.4119 

11/16 8.4430 5.6727 

3/4 8.6394 5.9396 

13/16 8.8357 6.2126 

7/8 9.0321 6.4918 

15/16 9.2284 6.7771 

3 9.4248 7.0686 

1/8 9.8175 7.6699 

1/4 10.210 8.2958 

3/8 10.603 8.9462 

1/2 10.996 9.6211 

5/8 11.388 10.321 

3/4 11.781 11.045 

7/8 12.174 11.793 

4 12.566 12.566 

1/8 12.959 13.364 

1/4 13.352 14.186 

3/8 13.744 15.033 

1/2 14.137 15.904 

5/8 14.530 16.800 

3/4 14.923 17.721 

7/8 15.315 18.665 

5 15.708 19.635 

1/8 16.101 20.629 

1/4 16.493 21.648 

3/8 16.886 22.691 

1/2 17.279 22.758 

5/8 17.671 24.850 

3/4 18.064 25.967 

7/8 18.457 27.109 

6 18.850 28.274 

1/8 19.242 29.465 

1/4 19.635 30.680 

3/8 20.028 31.919 

1/2 20.420 33.183 

5/8 20.813 34.472 

3/4 21.206 35.785 

7/8 21.598 37.122 

7 21.991 38.485 

1/8 22.384 39.871 

1/4 22.777 41.282 

3/8 23.169 42.718 

7 1/2 23.562 44.179 

5/8 23.955 45.664 

3/4 24.347 47.173 

7/8 24.740 48.707 

8 25.133 50.265 

1/8 25.525 51.849 

1/4 25.918 53.456 

3/8 26.311 55.088 

1/2 26.704 56.745 

5/8 27.096 58.426 

3/4 27.489 60.132 

7/8 27.882 61.862 

9 28.274 63.617 

1/8 28.667 65.397 

1/4 29.060 67.201 

3/8 29.452 69.029 

1/2 29.845 70.882 

5/8 30.238 72.760 

3/4 30.631 74.662 

7/8 31.023 76.589 

10 31.416 78.540 

1/8 31.809 80.516 

1/4 32.201 82.516 

3/8 32.594 84.541 

1/2 32.987 86.590 

5/8 33.379 88.664 

3/4 33.772 90.763 

7/8 34.165 92.886 

11 34.558 95.033 

1/8 34.950 97.205 

1/4 35.343 99.402 

3/8 35.736 101.62 

1/2 36.128 103.87 

5/8 36.521 106.14 

3/4 36.914 108.43 

7/8 37.306 110.75 

12 37.699 113.10 

1/8 38.092 115.47 

1/4 38.485 117.86 

3/8 38.877 120.28 

1/2 39.270 122.72 

5/8 39.663 125.19 

3/4 40.055 127.68 

7/8 40.448 130.19 

13 40.841 132.73 

1/8 41.233 135.30 

1/4 41.626 137.89 

3/8 42.019 140.50 

1/2 42.412 143.14 

5/8 42.804 145.80 

3/4 43.197 148.49 

7/8 43.590 151.20 

14 43.982 153.94 

1/8 44.375 156.70 

1/4 44.768 159.48 

3/8 45.160 162.30 

1/2 45.553 165.13 

5/8 45.946 167.99 

14 3/4 46.338 170.87 

7/8 46.731 173.78 

15 47.124 176.71 

1/8 47.517 179.67 

1/4 47.909 182.65 

3/8 48.302 185.66 

1/2 48.695 188.69 

5/8 49.087 191.75 

3/4 49.480 194.83 

7/8 49.873 197.93 

16 50.265 201.06 

1/8 50.658 204.22 

1/4 51.051 207.39 

3/8 51.444 210.60 

1/2 51.836 213.82 

5/8 52.229 217.08 

3/4 52.622 220.35 

7/8 53.014 223.65 

17 53.407 226.98 

1/8 53.800 230.33 

1/4 54.192 233.71 

3/8 54.585 237.10 

1/2 54.978 240.53 

5/8 55.371 243.98 

3/4 55.763 247.45 

7/8 56.156 250.95 

18 56.549 254.47 

1/8 56.941 258.02 

1/4 57.334 261.59 

3/8 57.727 265.18 

1/2 58.119 268.80 

5/8 58.512 272.45 

3/4 58.905 276.12 

7/8 59.298 279.81 

19 59.690 283.53 

1/8 60.083 287.27 

1/4 60.476 291.04 

3/8 60.868 294.83 

1/2 61.261 298.65 

5/8 61.654 302.49 

3/4 62.046 306.35 

7/8 62.439 310.24 

20 62.832 314.16 

1/8 63.225 318.10 

1/4 63.617 322.06 

3/8 64.010 326.05 

1/2 64.403 330.06 

5/8 64.795 334.10 

3/4 65.188 338.16 

7/8 65.581 342.25 

21 65.973 346.36 

1/8 66.366 350.50 

1/4 66.759 354.66 

3/8 67.152 358.84 

1/2 67.544 363.05 

5/8 67.937 367.28 

3/4 68.330 371.54 

7/8 68.722 375.83 


AREAS & CIRCUMFERENCES OF CIRCLES 

DIA. CIRCUM. AREA DIA. CIRCUM. AREA DIA. CIRCUM. AREA DIA. CIRCUM. AREA 

22 69.115 380.13 

1/8 69.508 384.46 

1/4 69.900 388.82 

3/8 70.293 393.20 

1/2 70.686 397.61 

5/8 71.079 402.04 

3/4 71.471 406.49 

7/8 71.864 410.97 

23 72.257 415.48 

1/8 72.649 420.00 

1/4 73.042 424.56 

3/8 73.435 429.13 

1/2 73.827 433.74 

5/8 74.220 438.36 

3/4 74.613 443.01 

7/8 75.006 447.69 

24 75.398 452.39 

1/8 75.791 457.11 

1/4 76.184 461.86 

3/8 76.576 466.64 

1/2 76.969 471.44 

5/8 77.362 476.26 

3/4 77.754 481.11 

7/8 78.147 485.98 

25 78.540 490.87 

1/8 78.933 495.79 

1/4 79.325 500.74 

3/8 79.718 505.71 

1/2 80.111 510.71 

5/8 80.503 515.72 

3/4 80.896 520.77 

7/8 81.289 525.84 

26 81.681 530.93 

1/8 82.074 536.05 

1/4 82.467 541.19 

3/8 82.860 546.35 

1/2 83.252 551.55 

5/8 83.645 556.76 

3/4 84.038 562.00 

7/8 84.430 567.27 

27 84.823 572.56 

1/8 85.216 577.87 

1/4 85.608 583.21 

3/8 86.001 588.57 

1/2 86.394 593.96 

5/8 86.786 599.37 

3/4 87.179 604.81 

7/8 87.572 610.27 

28 87.965 615.75 

1/8 88.357 621.26 

1/4 88.750 626.80 

3/8 89.143 632.36 

1/2 89.535 637.94 

5/8 89.928 643.55 

3/4 90.321 649.18 

7/8 90.713 654.84 

29 91.106 660.52 

1/8 91.499 666.23 

29 1/4 91.892 671.96 

3/8 92.284 677.71 

1/2 92.677 683.49 

5/8 93.070 689.30 

3/4 93.462 695.13 

7/8 93.855 700.98 

30 94.248 706.86 

1/8 94.640 712.76 

1/4 95.033 718.69 

3/8 95.426 724.64 

1/2 95.819 730.62 

5/8 95.211 736.62 

3/4 96.604 742.64 

7/8 96.997 748.69 

31 97.389 754.77 

1/8 97.782 760.87 

1/4 98.175 766.99 

3/8 98.567 773.14 

1/2 98.960 779.31 

5/8 99.353 785.51 

3/4 99.746 791.73 

7/8 100.138 797.98 

32 100.531 804.25 

1/8 100.924 810.54 

1/4 101.316 816.86 

3/8 101.709 823.21 

1/2 102.102 829.58 

5/8 102.494 835.97 

3/4 102.887 842.39 

7/8 103.280 848.83 

33 103.673 855.30 

1/8 104.065 861.79 

1/4 104.458 868.31 

3/8 104.851 874.85 

1/2 105.243 881.41 

5/8 105.636 888.00 

3/4 106.029 894.62 

7/8 106.421 901.26 

34 106.814 907.92 

1/8 107.207 914.61 

1/4 107.600 921.32 

3/8 107.992 928.06 

1/2 108.385 934.82 

5/8 108.778 941.61 

3/4 109.170 948.42 

7/8 109.563 955.25 

35 109.956 962.11 

1/8 110.348 969.00 

1/4 110.741 975.91 

3/8 111.134 982.84 

1/2 111.527 989.80 

5/8 111.919 996.78 

3/4 112.312 1003.8 

7/8 112.705 1010.8 

36 113.097 1017.9 

1/8 113.490 1025.0 

1/4 113.883 1032.1 

3/8 114.275 1039.2 

36 1/2 114.668 1046.3 

5/8 115.061 1053.5 

3/4 115.454 1060.7 

7/8 115.846 1068.0 

37 116.239 1075.2 

1/8 116.632 1082.5 

1/4 117.024 1089.8 

3/8 117.417 1097.1 

1/2 117.810 11045 

5/8 118.202 1111.8 

3/4 118.595 1119.2 

7/8 118.988 1126.7 

38 119.381 1134.1 

1/8 119.773 1141.6 

1/4 120.166 1149.1 

3/8 120.559 1156.6 

1/2 120.951 1164.2 

5/8 121.344 1171.7 

3/4 121.737 1179.3 

7/8 122.129 1186.9 

39 122.522 1194.6 

1/8 122.915 1202.3 

1/4 123.308 1210.0 

3/8 123.700 1217.7 

1/2 124.093 1225.4 

5/8 124.486 1233.2 

3/4 124.878 1241.0 

7/8 125.271 1248.8 

40 125.664 1256.6 

1/8 126.056 1264.5 

1/4 126.449 1272.4 

3/8 126.842 1280.3 

1/2 127.235 1288.2 

5/8 127.627 1296.2 

3/4 128.020 1304.2 

7/8 128.413 1312.2 

41 128.805 1320.3 

1/8 129.198 1328.3 

1/4 129.591 1336.4 

3/8 129.983 1344.5 

1/2 130.376 1352.7 

5/8 130.769 1360.8 

3/4 131.161 1369.0 

7/8 131.554 1377.2 

42 131.947 1385.4 

1/8 132.340 1393.7 

1/4 132.732 1402.0 

3/8 133.125 1410.3 

1/2 133.518 1418.6 

5/8 133.910 1427.0 

3/4 134.303 1435.4 

7/8 134.696 1443.8 

43 135.088 1452.2 

1/8 135.481 1460.7 

1/4 135.874 1469.1 

3/8 136.267 1477.6 

1/2 136.659 1486.2 

5/8 137.052 1494.7 

43 3/4 137.445 1503.3 

7/8 137.837 1511.9 

44 138.230 1520.5 

1/8 138.623 1529.2 

1/4 139.015 1537.9 

3/8 139.408 1546.6 

1/2 139.801 1555.3 

5/8 140.194 1564.0 

3/4 140.586 1572.8 

7/8 140.979 1581.6 

45 141.372 1590.4 

1/8 141.764 1599.3 

1/4 142.157 1608.2 

3/8 142.550 1617.0 

1/2 142.942 1626.0 

5/8 143.335 1634.9 

3/4 143.728 1643.9 

7/8 144.121 1652.9 

46 144.513 1661.9 

1/8 144.906 1670.9 

1/4 145.299 1680.0 

3/8 145.691 1689.1 

1/2 146.084 1698.2 

5/8 146.477 1707.4 

3/4 146.869 1716.5 

7/8 147.262 1725.7 

47 147.655 1734.9 

1/8 148.048 1744.2 

1/4 148.440 1753.5 

3/8 148.833 1762.7 

1/2 149.226 1772.1 

5/8 149.618 1781.4 

3/4 150.011 1790.8 

7/8 150.404 1800.1 

48 150.796 1809.6 

1/8 151.189 1819.0 

1/4 151.582 1828.5 

3/8 151.975 1837.9 

1/2 152.367 1847.5 

5/8 152.760 1857.0 

3/4 153.153 1866.5 

7/8 153.545 1876.1 

49 153.938 1885.7 

1/8 154.331 1895.4 

1/4 154.723 1905.0 

3/8 155.116 1914.7 

1/2 155.509 1924.4 

5/8 155.902 1934.2 

3/4 156.294 1943.9 

7/8 156.687 1953.7 

50 157.080 1963.5 

1/8 157.472 1973.3 

1/4 157.865 1983.2 

3/8 158.258 1993.1 

1/2 158.650 2003.0 

5/8 159.043 2012.9 

3/4 159.436 2022.8 

7/8 159.829 2032.8 

A Product of GA Industries Page 64

IMPORTANT NOTES! 

Sold Only Through Distributors A Product of GA Industries

9025 MARSHALL ROAD • CRANBERRY TOWNSHIP, PA 16066 USA 

PHONE: (724) 776-1020 

FAX: (724) 776-1254 AND (724) 625-2170 

WEB SITE: WWW.GAINDUSTRIES.COM • E-MAIL: GA@GAINDUSTRIES.COM 

MEMBER 

American Water Works Association 

MEMBER 

Water & Wastewater Equipment 

Manufacturers Association, Inc. 

ESTABLISHED 1908 

MEMBER 

COMM 07/04

Air Release Valves Air/Vacuum Valves Combination ... - GA Industries

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