Catalog - Tri-State Technical Sales Corp.

“THE NEXT GENERA TION” 

, INC 

High Performance 

BULLETIN: F78K1105 

“EXPERTS IN SOFT-SEATED VA L VE TECHNOLOGY”

2 

TABLE OF CONTENTS 

SECTION 

OVERVIEW 

CONSTRUCTIO N 

PAGES 

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 

Dimensions and W eights . . . . . . . . . . . . . . . . . . . . 4 

Inlet/Outlet Flange Ratings . . . . . . . . . . . . . . . . . . 5 

Seat and Seal Data . . . . . . . . . . . . . . . . . . . . . . . . . 5 

Main V alve Assembly and Constructio n. . . . . . 6-7 

F200 Snap Acting Pilot V alve Operation . . . . . . . 8 

F200 Snap Acting Pilot V alve Constructio n . . . . . 9 

F300 Modulating Pilot V alve Operation . . . . . . . 10 

F300 Modulating Pilot V alve Construction. . . . . 11 

F500 Modulating Pilot Valve Operation . . . . . . . 12 

F500 Modulating Pilot V alve Construction. . . . . 13 

Accessories and Options . . . . . . . . . . . . . . . . 14-15 

ENGINEERING DA TA 

Sizing: Gases and Liquids . . . . . . . . . . . . . . . . . . 16 

V iscosity Corr ection Factors 

. . . . . . . . . . . . . . . 17 

Sizing and Set Pr essur e Considerations 

for Backpr essure . . . . . . . . . . . . . . . . . . . . . . . . . 18 

Conversion Factors . . . . . . . . . . . . . . . . . . . . . . . 19 

Molecular W eights and C Factors . . . . . . . . . . . 20 

Air/Natural Gas Capacities . . . . . . . . . . . . . . 21-24 

W ater Capacities . . . . . . . . . . . . . . . . . . . . . . . . . 25 

Part Numbering . . . . . . . . . . . . . . . . . . . . . . . . . . 26 

Specification Sheet and Or der For m . . . . . . . . . 27 

The policy of FLOW SAFE and its authorized 

assemblers is a commitment to value thr ough: 

Envir onmentally Compatible Products 

Cost Ef ficient Design, with Minimal Parts 

Quality Products, Readily Available 

Flexibility to meet Unique Customer Needs 

“No Hassle” Service 

INTRODUCTION AND FEATURES 

Intr oduction 

T oday’ s industrial needs ar e being driven by r equir ements for 

high capacity , leak-tight safety re lief valves to r educe fugitive 

emissions and to save customer pr oduct. The FLOW SAFE 

F7000/8000 Series Pilot Operated Safety Relief Va lves, with 

accurate operational characteristics, ar e engineer ed to pr ovide 

superior performance for today’ s industries. 

Dir ect-mount pilot valves, minimizing 

potential leak paths. 

Modulating or snap-acting, with inter changeable 

pilot valves. 

Integral Module (IM) design available, 

completely eliminating pilot tubing. 

Superior main valve seating for ce, pr oportional 

to nameplate set pr essur e. 

Repeatable, leak-tight seating and r e-seating, 

due to soft seat design. 

Compact pr ofiles,for easier handling, installation 

and maintenance. 

Adjustable blowdown capability . 

Large capacities thr ough the full -bore nozzle (F7000) 

and a variety of r educed API orifice selections (F8000) . 

Superior flow capacities, independently (NB) verified. 

Full lift at set pr essur e upon demand. 

Easy convertability of orifice sizes, field adjustable. 

Integral exhaust with F300 and F500 pilot valve. 

Set pr essur es fr om 15 to 6000 psig. 

-423F to +525F temperatur e range. 

A variety of materials and end connections, 316SS 

trim standar d on carbon steel main valves. 

No metal-to-metal contact of piston to liner assembly. 

Top entry main valve for easy maintenance/inspection. 

Lifting lugs standar d on sizes 2x3 and larger . 

One-piece main valve casting with integral flanges. 

Backflow pr eventer and field test connection - 

standar d featur es. 

Adjustments ar e heavy duty stainless steel 

safety-wir ed and sealed. 

All valves bear ASME “UV” stamp, at 15 psig 

and above. 

Compliance with industry standar ds, 

including ASME, NACE, ANSI, and DOT . 

F7000/8000 SERIES

OPERATION 

System pr essur e is r outed fr om below the valve thr ough 

the pilot valve to the dome cavity of the main valve. This 

pr essur e, acting on a piston (dome) ar ea A d 

larger than 

the seat ar ea (A s 

), cr eates an ef fective downwar d for ce 

( F=Px( A d 

-A s 

)) holding the main valve piston down in 

the closed position. 

At the designated set pr essur e, the pilot valve 

r educes the dome pr essur e, pr oportional to demand 

if modulating (F300 or F500), or fully if snap-acting (F200), 

and allows the piston to go into lift. Once the system 

pr essur e is r elieved, the pilot valve closes at the pr eset 

blowdown, allowing the dome to r epr essurize and the 

main valve piston to close. When closed, dome pr essur e 

acting on a dif fer ential ar ea between the top and bottom 

of the piston assembly , cr eates a downwar d for ce on 

the seat pr oviding leak-tight shutof f. 

The F7000/8000 utilizes an elastomeric or plastic seat 

on the piston to achieve leak-tight seating. A dynamic 

piston seal pr events any leakage fr om the dome to the 

discharge. Wear rings on the piston eliminate metal-tometal 

contact with the liner and help to pr ovide smooth 

and consistent operation. Elastomeric/plastic seals seal 

the main valve and pilot valves. 

The F200 Snap-Acting pilot valve blowdown is set at 

5-7% of the set pr essur e and can be adjusted fr om 3% 

to 20% if so specified. The F300 and F500 modulating pilot 

valves pr ovide zer o blowdown, i.e. the main valve opens in 

pr oportion to demand and closes at the set pr essur e. 

The orifice size may be easily selected by choosing 

a full-bor e fixed inlet nozzle on the F7000, or by 

converting to a r educed size orifice (F8000) by 

attaching FLOW SAFE’ s unique annular-flow plug 

to the bottom of the piston assembly . This plug reduces 

the ef fective flow ar ea of the valve by directing the 

fluid between the plug O.D. and the nozzle I.D. This 

featur e in orifice selection allows the valve owner 

greater versatility in valve standar dization, utilization, 

and minimized inventor y. 

The F7000/8000 Series is particularly advantageous 

and cost-ef fective in installations wher e: 

Ther e may be size and weight limitations 

for the valve. 

A high cycling rate exists. 

A long service life is r equir ed. 

Minimal pr oduct loss is important . 

Reduced maintenance and installation 

time is desirable. 

3 

CLOSED 

OPEN 

OUTLET 

INLET 

F7000/8000 SERIES

DIMENSIONS AND WEIGHTS 

4 

F7000/8000 Series 

Flanged 

* With F300 Pilot Valve., 

Deduct 2" (50 mm) for F200 Pilot Valve. 

Add 1/2" (13 mm) for F500 Pilot Valve 

thru Class 600 inlet. 

Add 4" (100 mm) for F500 Pilot Valve 

over Class 600 inlet. 

** See Page 5 for reduced 

orifice flow areas. 

B 

F7000/8000 Series 

Threaded 

B 

Available Available Dimensions, in (mm) 

Full Bore Reduced Inlet Outlet Approx. 

Orifice Orifice Flange Flange 

C weight, 

(F7000) (F8000)** A B approx.* lb (kg) 

.957" D, E, F 1" - 150# 2" - 150# 4.38 (111) 4.50 (114) 13.3 (338) 38 (17) 

2 

(0.719 in ) D, E, F 1" - 300# 2" - 150# 4.38 (111) 4.50 (114) 13.3 (338) 40 (18) 

2 

(4.64 cm ) D, E, F 1" - 600# 2" - 150# 4.38 (111) 4.50 (114) 13.3 (338) 40 (18) 

D, E, F 1" - 900# 2" - 300# 4.94 (126) 4.75 (121) 13.8 (351) 50 (23) 

.815" D, E, F 1" - 1500# 2" - 300# 4.94 (126) 4.75 (121) 13.8 (351) 50 (23) 

2 2 

(0.521 in ) (3.36 cm ) D, E 1" - 2500# 2" - 300# 4.94 (126) 4.75 (121) 13.8 (351) 50 (23) 

1.500" F, G, H 1-1/2" - 150# 3" - 150# 5.13 (130) 4.88 (124) 14.6 (371) 50 (23) 

2 2 

(1.767 in ) (11.40 cm ) F, G, H 1-1/2" - 300# 3" - 150# 5.13 (130) 4.88 (124) 14.6 (371) 55 (25) 

F, G, H 1-1/2" - 600# 3" - 150# 5.13 (130) 4.88 (124) 14.6 (371) 55 (25) 

1.337" F, G, H 1-1/2" - 900# 3" - 300# 6.38 (162) 6.75 (171) 15.1 (384) 80 (36) 

2 2 

(1.40 in ) (9.06 cm ) F, G, H 1-1/2" - 1500# 3" - 300# 6.38 (162) 6.75 (171) 15.1 (384) 80 (36) 

1.100" F, G, H 1-1/2" - 2500# 3" - 300# 6.38 (162) 6.75 (171) 15.1 (384) 90 (41) 

2 2 

(0.950 in ) (6.13 cm ) 

1.939" G, H, J 2" - 150# 3" - 150# 5.38 (137) 4.88 (124) 15.8 (401) 65 (29) 

2 

(2.953 in ) G, H, J 2" - 300# 3" - 150# 5.38 (137) 4.88 (124) 15.8 (401) 70 (32) 

2 

(19.05 cm ) G, H, J 2" - 600# 3" - 150# 5.38 (137) 4.88 (124) 15.8 (401) 70 (32) 

1.689" G, H, J 2" - 900# 3" - 300# 6.56 (167) 6.75 (171) 17.0 (432) 90 (41) 

2 2 

(2.240 in ) (14.45 cm ) G, H, J 2" - 1500# 3" - 300# 6.56 (167) 6.75 (171) 17.0 (432) 90 (41) 

1.503" G, H, J 2" - 2500# 3" - 300# 7.00 (178) 6.75 (171) 17.4 (442) 115 (52) 

2 2 

(1.774 in ) (11.44 cm ) 

2.900" J, K, L 3" - 150# 4" - 150# 6.13 (156) 6.38 (162) 18.3 (465) 90 (41) 

2 

(6.605 in ) J, K, L 3" - 300# 4" - 150# 6.38 (162) 6.38 (162) 18.5 (470) 100 (45) 

2 

(42.61 cm ) J, K, L 3" - 600# 4" - 150# 6.38 (162) 6.38 (162) 18.5 (470) 100 (45) 

2.624" J, K, L 3" - 900# 4" - 300# 7.50 (191) 7.13 (181) 19.6 (498) 130 (59) 

2 2 

(5.408 in ) (34.89 cm ) J, K, L 3" - 1500# 4" - 300# 7.50 (191) 7.13 (181) 19.6 (498) 145 (66) 

3.816" L, M, N, P 4" - 150# 6" - 150# 7.75 (197) 8.25 (210) 18.8 (478) 170 (77) 

2 

(11.437 in ) L, M, N, P 4" - 300# 6" - 150# 7.75 (197) 8.25 (210) 18.8 (478) 170 (77) 

2 

(73.79 cm ) L, M, N, P 4" - 600# 6" - 150# 7.75 (197) 8.25 (210) 18.8 (478) 175 (79) 

3.624" L, M, N, P 4" - 900# 6" - 300# 9.74 (247) 9.19 (233) 20.8 (528) 240 (109) 

2 

(10.315 in ) 

2 

(66.55 cm ) 

5.760" 

L, M, N, P 

Q, R 

4" - 1500# 

6" - 150# 

6" - 300# 

8" - 150# 

9.74 (247) 

9.44 (240) 

9.19 (233) 20.8 (528) 240 (109) 

9.50 (241) 22.8 (579) 270 (122) 

2 

(26.06 in ) Q, R 6" - 300# 8" - 150# 9.44 (240) 9.50 (241) 22.8 (579) 270 (122) 

2 

(168.1 cm ) Q, R 6" - 600# 8" - 150# 9.69 (246) 9.50 (241) 23.4 (594) 310 (141) 

7.625" T 8" - 150# 10" - 150# 10.88 (276) 11.00 (279) 26.5 (673) 460 (209) 

2 

(45.66 in ) T 8" - 300# 10" - 150# 10.88 (276) 11.00 (279) 26.5 (673) 460 (209) 

2 

(294.6 cm ) T 8" - 600# 10" - 150# 11.62 (295) 11.00 (279) 27.1 (688) 520 (236) 

11.935" W 12” - 150# 16” - 150# 11.92 (303) 15.56 (395) 32.0 (813) 1100 (500) 

2 2 

(111.87 in ) (721.7 cm ) 

.957" D, E, F 1" FNPT 2" FNPT 5.06 (129) 3.00 (76) 14.0 (356) 35 (16) 

2 2 

(0.719 in ) (4.64 cm ) 

1.500" F, G, H 1-1/2" FNPT 3" FNPT 4.63 (118) 3.75 (95) 14.1 (358) 45 (20) 

2 2 

(1.767 in ) (11.40 cm ) 

F7000/8000 SERIES

F8000 ANNULAR 

FLOW PLUGS 

INLET/OUTLET FLANGE RATINGS 

Maximum Working Pressure, psig (barg) 

@ Temperature 

ASME 

-423 to -21°F -20 to 100°F 200°F 300°F 400°F 500°F 

essur 

g 

Class Material (-252 to -29°C) (-28 to 38°C) (93°C) (149°C) (204°C) (260°C) 

150# C. Steel Flange --- 290 (20) 260 (18) 230 (15) 200 (13) 170 (11) 

S. Steel Class 275 (19) M 275 (19 ) 235 (16) 215 (14) 195 300(13) 

400170 (11) 525 

300# C. Steel --- 750 (51) 750 (51) 730 (50) 705 (48) 665 (45) 

S. Steel 720 (49) 720 (49) 620 (42) 560 (38) 515 (35) 480 (33) 

600# * C. Steel --- 1500 (103) 1500 (103) 1455 (100) 1405 (97) 1330 (91) 

S. Steel 1440 (99) 1440 (99) 1240 (85) 1120 (77) 1025 (70) 955 (65) 

900# C. Steel --- 2250 (155) 2250 (155) 2185 (150) 2110 (145) 1995 (13) 

S. Steel 2160 (149) 2160 (149) 1860 (128) 1680 (115) 1540 (106) 1435 (99) 

1500# C. Steel --- 3750 (258) 3750 (258) 3640 (251) 3520 (242) 3325 (229) 

S. Steel 3600 (248) 3600 (248) 3095 (213) 2795 (192) 2570 (177) 2390 (164) 

2500# C. Steel --- 6000 (413) 6000 (413) 6000 (413) 5865 (404) 5540 (382) 

S. Steel 6000 (413) 6000 (413) 5160 (355) 4660 (321) 4280 (295) 3980 ( 274) 

Carbon steel: ASME SA-352 LCC Other materials available upon request. 

Stainless steel: ASME SA-351 CF3M 

Reference for pressure/temp. ratings: ASME B16.34 / B16.5 

* Includes 1 x 2 and 1-1/2 x 3 NPT 

Valve 

Size 

Orifice 

Size 

Flow Area, 

in 2 (cm 2 ) 

1 x 2 D 

E 

F 

0.134 (0.86) 

0.235 (1.52) 

0.358 (2.31) 

1-1/2 x 3 F 

G 

H 

0.358 (2.31) 

0.588 (3.79) 

0.916 (5.91) 

2 x 3 G 

H 

J 

0.588 (3.79) 

0.916 (5.91) 

1.503 (9.70) 

3 x 4 J 

K 

L 

1.503 (9.70) 

2.147 (13.85) 

3.277 (21.14) 

4 x 6 L 

M 

N 

P 

3.277 (21.14) 

4.147 (26.75) 

5.014 (32.35) 

7.397 (47.72) 

6 x 8 Q 

R 

12.913 (83.31) 

18.704 (120.7) 

8 x 10 T 30.409 (196.2) 

12 x 16 W 78.81 (508.4) 

Teflon and Vespel and registered trademarks of the DuPont Company. 

Viton is a registered trademark of DuPont Performance Elastomers. 

SEAT AND SEAL DATA 

Continuous Process Min. 

Max. 

Temp., 

o F ( o C ) Pressure, Pressure, 

Material Min. Max. psig (barg) psig(barg) 

Buna-N -30 (-34) 275 (135) 15 (1) 6000 (413) 

Viton® -30 (-34 ) 400 (204) 15 (1) 6000 (413) 

Ethylene Propylene -65 (-53) 325 (162) 15 (1) 6000 (413 ) 

Polyurethane -60 (-51) 225 (107) 15 (1) 6000 (413) 

PTFE / Teflon® -423 (-252) 400 (204) 15 (1) 1000 (69) 

PCTFE /Kel-F -423 (-252) 400 (204) 1000 (69) 4000 (275) 

Vespel® -423 (-252) 500 (260) 4000 (275) 6000 ( 413) 

PEEK 0 (-1 7) 525 (273 4000 (275) 6000 (413) 

5 

F7000/8000 SERIES

MAIN VALVE CONSTRUCTION 

Part Name 

1 1,2 

Carbon Steel, -S1 (-N1 ) 

1 1,2 

Stainless Steel, -SS (-NS ) 

Body 

Liner 

Piston 

Retainer 

Annular Flow Plug (F8000 only) 

Retainer Bolt 

Piston Seal 

Backup Rings 

Wear / Wedge Ring 

Seat 

Field Test Conn. (FTC) Body 

FTC Piston, Connector, Plug 

Pickup Tube 

Lock Nut 

FTC Crush Ring 

FTC Seals 

Cap 

Lockwasher 

Cap Bolt 

Liner Seal 

Spool Piece (IM only) 

Spool Piece O-rings (IM only) 

Pilot Mounting Bolt 

Nameplate 

Locking Thread Insert 

Pipe Plug 

Dome Spring 

Lifting Bracket 

SA-352 LCC 

A743 CF8M 

A479 316 or A351 CF8M 

316 SS 

A479 316 

A193 B8 or B8M 

Elastomer 3 or PTFE 4 

PTFE 

Graphite-filled PTFE 

Elastomer or Plastic 3 

A479 316 

316 SS 

A479 316 

SS 

PTFE 

Elastomer 3 

SA-516 Gr. 70 

SS 

SA-193 B7 

Elastomer 3 

316 SS 

Elastomer 3 

304 SS 

SS or Aluminum 

304 SS (Inconel X750) 

CS 

302/304 SS (Inconel X750) 

A36 

SA-351 CF3M 

A743 CF8M 

A479 316 or A351 CF8M 

316 SS 

A479 316 

A193 B8 or B8M 

Elastomer 3 or PTFE 4 

PTFE 

Graphite-filled PTFE 

Elastomer or Plastic 3 

A479 316 

316 SS 

A479 316 

SS 

PTFE 

Elastomer 3 

SA-240 / SA-479 316 

SS 

SA-193 B8 

Elastomer 3 

316 SS 

Elastomer 3 

304 SS 

SS 

304 SS (Inconel X750) 

304 or 316 SS 

302/304 SS (Inconel X750) 

SS 

7 

1 

Part number material code – See Page 26 

2 

(Alternate materials) to meet NACE MR0175 

3 

See Page 5 for seat and seal selections Other materials 

4 

PTFE piston seals for F7040/8040 have 316 SS spring available upon request 

"IM"-STYLE 

PILOT 

(F300 SHOWN) 

BACKUP RING 

SPOOL PIECE 

O-RING 

F 

PILOT MOUNTING 

BOLTS 

SPOOL PIECE 

O-RING 

BACKUP RING 

SPOOL PIECE 

(PRESSURE ISOLATION SPOOL) 

Pilot 

Supply 

Ports 

FTC 

PISTON 

FTC 

CONNECTOR 

BACKUP RING 

SPOOL PIECE 

O-RING 

VENTED PLUG 

FTC 

SEAL 

SPOOL PIECE SEAL 

ARRANGEMENT 

FTC PISTON 

SEAL 

F7040 "IM" VALVE ASSEMBLY 

F7000/8000 SERIES

F200 SERIES PILOT VALVE OPERATION 

SPECIFICATIONS 

Style: Non-Flowing, Snap-Acting 

Service: Gas/Vapor 

Set Pressure Range: 15 – 6000 psig 

FEATURES 

FEATURES 

Direct Mount to Main Valve 

Built-in Backflow Preventer 

Adjustable Blowdown 

Variety of Materials Available 

Balanced against backpressure 

when vented to atmosphere 

Simple to Maintain 

Main Valve Full Lift at Set Point 

OPEN (RELIEVING) 

POSITION 

INLET PRESSURE 

ABOVE SET 

PRESSURE 

EXHAUST 

8 

CLOSED 

POSITION 


BELOW SET 

PRESSURE 

INLET 

CLOSED 

POSITION 


LOADING DOME 

THROUGH BFP 

DOME 

FILL 

CLOSED 

POSITION 

EXHAUST PRESSURE 

LOADING DOME 

THROUGH BFP 

INLET 

DOME 

FILL 

DOME 

FILL 

INLET 

FEED 

INLET 

BACKFLOW 

PREVENTER 

(BFP) 

INLET 

EXHAUST 

BACKPRESSURE 

F7000/8000 SERIES

1 

9 

F7000/8000 SERIES


FEATURES 

10 

F7000/8000 SERIES

Part Name 

Body 

Internal Plug 

Lower Piston 

Sleeve 

Seals, O-rings 

Seat 

Backup Rings 

Spacer Pin 

Seat Retainer Nozzle 

Upper Piston 

Diaphragm Fastener 

Diaph. Support Disc 

Diaph. Support Ring 

Diaphragm Disc 

Diaph. Area Reducer 

Adapter 

Spring Washer 

Spring 

Bonnet 

Bolt 

Diaphragm 

Lock Nuts 

PA Screw 

Cap 

BFP Nozzle 

BFP Piston 

BFP Seal 

BFP Jam Nut 

Prop. Band Screw 

Prop. B. S. Seal 

Pipe Plugs 

Inlet Screen 

Vent/Bug Screen 

Lockwire 

Standard Mat'ls 

SA-479 316 

A479 316 

A479 316 

A479 316 

Elastomer 1 

Elastomer 1 

Teflon / PTFE 

A479 316 

A479 316 

A479 316 

A479 316 

A479 316 

A479 316 

A479 316 

A479 316 

A479 316 

A479 316 

302/304/17-7 SS 

A351 CF8M 

304 or 13-8 SS 

Elastomer 2 

SS 

A479 316 

A479 316 

A479 316 

A479 316 

Teflon / PTFE 

304 or 316 SS 

A479 316 

Teflon / PTFE 

304 or 316 SS 

316 SS 

304 or 316 SS 

SS 

1 

See Page 5 for seat and seal selections 

2 

Available in Buna-N, Viton, EPDM, Teflon/FEP 

Standard materials meet NACE MR0175 

1 

BOLT 

DIAPHRAGM 

VENT/ 

BUG SCREEN 

DIAPHRAGM 

FASTENER SEAL 

SEAT 

SMALL 

FACE SEAL 

UPPER 

SLEEVE SEAL 

LOWER 

SLEEVE SEAL 

SLEEVE 

SPACER PIN 

LARGE 

FACE SEAL 

ADAPTER SEAL 

F300 SERIES PILOT VALVE CONSTRUCTION 

PIPE 

PLUG 

DIAPHRAGM 

AREA REDUCER 

CAP 

LOCK NUT 

BONNET 

BODY 

A 

A 

LOWER 

PISTON 

LOWER 

PISTON SEAL 

INTERNAL 

PLUG 

LP DIAPHRAGM STYLE (TO 285 PSIG) 

DIAPHRAGM DISC 

HP DIAPHRAGM STYLE 

(OVER 285 TO 500 PSIG) 

PA SCREW 

SPRING WASHER 

F 

LOCKWIRE 

SPRING 

DIAPHRAGM 

FASTENER 

DIAPHRAGM 

SUPPORT DISC 

DIAPH. SUPPORT 

RING SEAL 

DIAPHRAGM 

SUPPORT RING 

LEAD SEAL 

UPPER PISTON SEAL 

UPPER PISTON 

SEAT RETAINER NOZZLE 

PROPORTIONAL 

BAND SCREW 

LOCK NUT 

PROP. BAND 

SCREW SEAL 

PIPE PLUG 

INLET SCREEN 

PLUG SEAL 

ADAPTER 

11 

PIPE 

PLUG 

BFP NOZZLE 

BFP JAM NUT 

BACKUP RING 

UPPER PISTON SEAL 

BACKUP RING 

UPPER PISTON 

BFP PISTON 

BFP O-RING 

BFP SEAL 

BACKFLOW PREVENTER (BFP) 

SECTION A-A 

PISTON STYLE (OVER 500 - 6000 PSIG) 

F7000/8000 SERIES

F500 SERIES PILOT VALVE OPERATION 


Style: Modulating (Non-Flowing), Balanced 

Service: Gas/Vapor/Liquid 

Set Pressure Range: 

Diaphram Style: 15 – 285 psig 

Piston Style: 285 – 6000 psig 

FEATURES 

FEATURES 

Direct Mount to Main Valve w/Integral Exhaust 

Non-Flowing 

Opens in Proportion to Upset 

Balanced against Backpressure, 

with Built-in Backflow Preventer 

Optional Set Point Indicator Button Available 

Variety of Materials Available 

OPEN (RELIEVING) 

POSITION 


ABOVE SET 

PRESSURE 

DOME 

DISCHARGE 

12 

INLET 

PILOT VALVE 

EXHAUST 

Backflow Preventer (BFP) 

operation same as for F300 Pilot 

(see Page 10). 

DOME 

FILL 

CLOSED POSITION 


BELOW SET PRESSURE 

INLET 

F7000/8000 SERIES

ACCESSORIES AND OPTIONS 

Backflow Preventer (Standard Feature) 

If outlet pressure exceeds the inlet pressure, the main valve can 

open and backfow may occur. To prevent backflow, a standard 

backflow preventer is incorporated in the F200, F300, and 

F500 pilots. An increase in the outlet pressure above the inlet is 

transmitted to the top of the main valve piston, thus keeping 

the main valve closed and protecting the vessel from exposure 

to backpressure and backflow contamination. 

DOME 

COMMUNICATION 

PORT 

INLET FEED 

EXHAUST 

BACKPRESSURE 

INLET 

14 

CLOSED WITH BACKPRESSURE 

GREATER THAN INLET PRESSURE 

INLET 

CLOSED WITH INLET PRESSURE APPLIED 

Manual/Remote Blowdown 

This allows the main valve to lift without opening the pilot valve, 

by discharging the piston dome pressure directly to the 

atmosphere. This is accomplished by use of a manual or 

automatic blowdown valve, e.g. hand valve or solenoid valve. 

MANUAL 

VALVE 

F7000/8000 SERIES

F 

ACCESSORIES AND OPTIONS 

Field Test Connection (FTC) 

This allows the user to verify the set pressure while 

in service without valve removal. An external pressure 

source is attached to the FTC to direct pressure 

to the pilot valve, while blocking off the inlet pressure, 

thus checking the set pressure and the general 

operation of the valve. 

Inlet Supply Filter 

A filter should be used for dirty applications to clean 

the supply fluid to the pilot valve. This is supplied 

with a drain fitting. 

15 

"IM" 

CONSTRUCTION 

Remote Pressure Pickup 

Remote pressure pickup is recommended when 

inlet piping pressure losses exceed 3% of relief valve 

set pressure. This allows a remote, more direct 

pressure sensing to the pilot valve. 

F7000/8000 SERIES

SIZING: GASES AND LIQUIDS 

16 

REF: API RP 520, Part 1 

Gases 

To size for gases, use the formulas below. 

To select the proper orifice for the particular service 

conditions, the following information is required: 

1. Required flow capacity 

2. Required set pressure 

3. Operating Pressure – to assure that it is below 

the reseat pressure 

4. Overpressure (10% Maximum) 

5. Molecular Weight/Gas Constant of Media 

6. Process Temperature 

Gases or Vapors 

(US units) 

A = 

V 

MTZ 

6.32 CKK b 

K c 

P 1 

- OR - - OR - 

A = W 

2 

TZ 

131.6W 

A = Required Valve Orifice Area (in 2 or cm ) 

A 

CKK b 

K c 

P TZ 

1 M 

CKK b 

K c 

P 1 M 

Q = Required Flow Rate (gpm or lpm) 

G = Specific Gravity of Liquid 

A = Required Valve Orifice Area (in 2 2 

or cm ) 

K = Certified (Derated) Coefficient of Discharge 

3 

V = Required Flow Capacity (scfm or Nm /min) 

(see chart below) 

W = Required Flow Capacity (lb/hr or kg/hr) 

K c 

= 0.9 with rupture disk upstream of relief valve; 

= 1.0 with no rupture disk 

K = Certified (Derated) Coefficient of Discharge 

(see chart below) 

K v 

= Viscosity Correction Factor (see Page 17) 

P 1 

= Pressure at Valve Inlet During Flow (psia or kPaa) P 1 

= Pressure at Valve Inlet During Flow (psig or kPag) 

= Set Pressure + Overpressure + P atm 

= Set Pressure + Overpressure 

P atm 

= Atmospheric Pressure 

14.7 psia or 101.3 kPaa if unknown 

P 2 

= Backpressure (psig or kPag) 

C = Gas Constant 

M = Molecular Weight of Flowing Media 

T = Inlet Temperature, Absolute 

R = (F + 460) or K = (C + 273) 

DISCHARGE COEFFICIENTS (K) 

Z = Compressibility Factor 

if Unknown, Z = 1.0 

F7000 F8000 

K b 

= Backpressure Correction Factor - 

See page 18 for subcritical flow; 

use 1.0 for critical flow 

K c 

= 0.9 with rupture disk upstream of relief valve; 

= 1.0 with no rupture disk 

Liquids 

To size for liquids, use the formulas below. 

To select the proper orifice for the particular service 

conditions, the following information is required: 

1. Required flow capacity 

2. Required set pressure 

3. Operating Pressure – to assure that it is below 

the reseat pressure 

4. Acceptable Overpressure (10% Maximum) 

5. Specific Gravity of the Liquid 

6. Backpressure 

(SI units) (US units) (SI units) 

352.5V MTZ 

Q G 

11.78Q G 

A = A = A 

CKK = 

b 

K c 

P 1 38 KK c 

K v 

P 1 

- P 2 

KK c 

K v 

P 1 

- P 2 

Gas .824 .878 

*Liquid .634 -- 

*F300 & F500 modulating pilots only 

F7000/8000 SERIES

SIZING FOR VISCOUS FLUIDS 

R = 

Viscosity Correction, 

per API RP520 

When sizing a valve for viscous liquid service, 

first size the valve for non-viscous conditions, 

to determine a preliminary required orifice area. 

Select the next larger orifice and then use that 

area in determining the Reynold’s number (R). 

The formulas below can be used to determine R. 

(US units) 

Q x (2800) x G 

C p 

x 

A 

– OR – 

12700 x Q 

R = SSU x A 

R = 

(SI units) 

Q x (1880) x G 

C p 

x 

A 

– OR – 

8522 x Q 

R = SSU x A 

2 2 

A = Effective (selected) discharge area (in or cm ) 

Q 

G 

C p 

= Required flowrate at the flowing temperature 

(gpm or lpm). 

= Specific gravity of the liquid at the 

flowing temperature. Water: G = 1.0 

= Absolute viscosity at the flowing temperature, 

in centipoise. 

SSU = Viscosity at the flowing temperature, 

in Saybolt Seconds Universal. 

After the value of R is determined, K v 

is obtained from 

the chart below. K v 

is then applied to correct the 

“preliminary required flow area”. If the corrected area 

exceeds the chosen standard orifice area, repeat the 

above procedure using the next larger orifice size. 

Minimum and maximum conditions should be 

considered when determining the required orifice size, 

for proper pilot valve operation. 

17 

F7000/8000 SERIES

SIZING AND SET PRESSURE CONSIDERATIONS FOR BACKPRESSURE 

18 

Constant Backpr essur e Sizing Factor (K b 

) 

(Gases & V apors Only) 

In general, backpr essur e has no ef fect on the flow 

capacity of the FLOW SAFE F7000/8000 Series of pilo t- 

operated valves as long as a critical flow condition exists. 

The critical flow pr essur e ratio for a particular gas may be 

estimated per API RP 520 by the equation below: 

P cf 

[ 

2 

] 

= 

P 1 

K + 1 

k /(k-1) 

k = Specific heat ratio for gas, C p /C v 

(see page 20) 

P 1 

= Upstr eam relieving pr essur e (psia) 

P cf 

= Critical flow nozzle pr essur e (psia) 

P B 

= Backpr essur e, psi a 

P s 

= Set pr essur e, psi a 

P o 

= O verpr essur e, psi 

W hen suf ficient back pr essur e exists to cr eate 

a subcritical flow condition, the critical sizing equatio n 

shown on Page 16 should be used along with the Backpr 

essur e Sizing Factor (K b 

) shown in the chart below . 

This method is described in detail in API RP520. 

Set pr essur es ar e not af f ected by backpr essur e when 

using the F300 or F500 pilot valve as it is balanced against 

such pr essur e, or the F200 as it is normally vented to 

atmosphe re . Caution should be used if the F200 vent is 

r outed to the main valve discharge or other pr essurized 

vessel, as the set pr essur e and blowdown may be 

af fected. 

Backpr essur e gr eater than the system inlet pr essur e 

normally would cause the main valve piston to open. 

Because the F200, F300, and F500 pilot valves ar e equipped 

w ith backflow pr eventers as standar d featur es, this 

cannot occur on the F7000/8000 valves. The 

backpr essur e is r outed to the main valve piston 

dome, keeping the valve closed and bubble-tight . 

Example: See figur e below . 

S et Pr essur e = 100 psig 

Overpr essur e = 10 psi 

Superimposed backpr essur e = 70 psi g 

Built-up backpr essur e = 10 ps ig 

Per cent absolute 

backpressure = 

K b 

= 0.87(for k=1.4) 

70+10+14. 7 

100+10+14. 7 

x 100 = 76% 

F7000/8000 SERIES

EQUIVALENTS AND CONVERSION FACTORS 

This table may be used two ways: 

1. Multiply the unit under column A by the figure under 

column B, to obtain the unit under column C. 

2. Divide the unit under column C by the figure under 

column B; the result is then the unit under column A. 

Multiply By To Obtain 

A B C 

Atmospheres 14.697 Pounds / sq. in. 

Atmospheres 1.033 Kilograms / sq. cm. 

Atmospheres 29.92 Inches of mercury 

Atmospheres 760. Millimeters of mercury 

Atmospheres 407.1 Inches of water 

Atmospheres 33.90 Feet of water 

Atmospheres 1.013 Bars 

Atmospheres 101.326 KiloPascals 

Barrels 42. Gallons (U.S.) 

Bars 14.5 Pounds / sq. in. 

Bars 1.02 Kilograms / sq. cm. 

Bars 100.0 KiloPascals 

Centimeters 0.3937 Inches 

Centimeters 0.03281 Feet 

Centimeters 0.01 Meters 

Centimeters 0.01094 Yards 

Cubic centimeters 0.06102 Cubic inches 

Cubic feet 7.48055 Gallons 

Cubic feet 0.17812 Barrels 

Cubic ft. / minute .02831 Cubic meters / minute 

Cubic ft. / second 448.833 Gallons / minute 

Cubic inches 16.39 Cubic centimeters 

Cubic inches 0.004329 Gallons 

Cubic meters 264.17 Gallons 

Cubic meters / hour 4.4 Gallons / minute 

Cubic meters / minute 35.32 Cubic ft./ minute 

Feet 0.3048 Meters 

Feet 0.3333 Yards 

Feet 30.48 Centimeters 

Feet of water 0.882 Inches of mercury 

Feet of water 0.433 Pounds / sq. in. 

Gallons (U.S.) 3785. Cubic centimeters 

Gallons (U.S.) 0.13368 Cubic feet 

Gallons (U.S.) 231. Cubic inches 

Gallons (Imperial) 277.4 Cubic inches 

Gallons (U.S.) 0.833 Gallons (Imperial) 

Gallons (U.S.) 3.785 Liters 

Gallons of water 8.328 Pounds (at 21°C) 

Gallons of liquid 

Pounds / hour liquid 

/ minute 550 x Sp. Gr. (at 21°C) 

Gallons / minute 0.002228 Cubic ft / second 

Grams .035 Ounces 

Inches 2.54 Centimeters 

Inches 0.0833 Feet 

Inches 0.0254 Meters 

Multiply By To Obtain 

A B C 

Inches 0.02778 Yards 

Inches of mercury 1.133 Feet of water 

Inches of mercury 0.4912 Pounds / sq. in. 

Inches of mercury 0.0334 Atmospheres 

Inches of mercury 0.0345 Kilograms / sq. cm. 

Inches of water 0.03613 Pounds / sq. in. 

Inches of water 0.07355 Inches of mercury 

Kilograms 2.205 Pounds 

Kilograms 0.001102 Short tons (2000 lbs) 

Kilograms 35.27 Ounces 

Kilograms .2646 Gallons (U.S.) 

Kilograms / minute 132.3 

H 2O @ 70F 

Pounds / hour 

Kilograms / sq. cm. 14.22 Pounds / sq. in. 

Kilograms / sq. cm. 0.9678 Atmospheres 

Kilograms / sq. cm. 28.96 Inches of mercury 

KiloPascals .145 Pounds / sq. in. 

KiloPascals .01 Bars 

KiloPascals .0102 Kilograms / sq. cm. 

Liters .035 Cubic feet 

Liters 1000. Cubic centimeters 

Liters 0.2642 Gallons 

Liters / hour 0.0044 gallons / minute 

Meters 3.281 Feet 

Meters 1.0936 Yards 

Meters 100. Centimeters 

Meters 39.37 Inches 

Pounds .1198 H2O @ 70F 

Gallons (U.S.) 

Pounds 453.6 Grams 

Pounds 0.0005 Short tons (2000 lbs) 

Pounds 0.4536 Kilograms 

Pounds 0.000454 Metric tons 

Pounds 16. Ounces 

Pounds / hour 6.32/M.W. Cubic ft. / minute 

Pounds / hour liquid 0.002/Sp.Gr. Gallons / minute liquid 

(at 21C ) 

Pounds / sq. in. 27.703 Inches of water 

Pounds / sq. in. 2.308 Feet of water 

Pounds / sq. in. 2.036 Inches of mercury 

Pounds / sq. in. 0.0703 Kilograms / sq. in. 

Pounds / sq. in. 0.0680 Atmospheres 

Pounds / sq. in. 51.71 Millimeters of mercury 

Pounds / sq. in. 0.7037 Meters of water 

Specific gravity 28.97 Molecular Wt. 

(of gas or vapors) 

(of gas or vapors) 

Square centimeters 0.1550 Square inches 

Square Inches 6.452 Square centimeters 

Water (cubic feet) 62.3 Pounds (at 21C ) 

Temperature 

Celsius = 5/9 (Fahrenheit – 32) 

Fahrenheit = 9/5 (Celsius) + 32 

19 

F7000/8000 SERIES

ENGINEERING DATA 

Molecular Weights and “C” Factors 

Listed below are the molecular weights, specific heat 

ratios, and “C” factors for common gases. This “C” 

factor is used in formulas for sizing valves for 

gas or vapor service. 

On the following pages are published capacity charts 

for two common gases, air and natural gas, and for 

water. These charts can be used for direct selection 

of the safety relief valve orifice required without 

calculations. Capacities in these charts are based 

upon a process media temperature of 60F , and a 

compressibility factor (Z) = 1.0. To determine capacities 

at other temperatures, further calculations should be 

made using the formulas on Page 16. 

20 

Specific 

Heat Ratio 

Gas Mol. Wt (Cp/Cv) C 

Acetylene - C 2 

H 2 

26 1.28 345 

Air 29 1.40 356 

Ammonia - NH 3 

17 1.31 348 

Argon - Ar 40 1.66 377 

Benzene - C 6 

H 6 

78 1.10 327 

Carbon Disulphide - CS 2 

76 1.21 338 

Carbon Dioxide - CO 2 

44 1.29 346 

Carbon Monoxide - CO 28 1.40 356 

Chlorine - Cl 2 

71 1.36 352 

Cyclohexane 84 1.08 324 

Ethane - C 2 

H 6 

30 1.19 336 

Ethylene - C 2 

H 4 

28 1.24 341 

Freon 22 86.5 1.18 335 

Helium - He 4 1.66 377 

Hexane - C 6 

H 14 

86 1.08 324 

Hydrochloric Acid - HCl 36.5 1.40 356 

Hydrogen - H 2 

2 1.41 357 

Hydrogen Sulfide - H 2 

S 34 1.32 348 

Iso Butane 58 1.11 328 

Methane - CH 4 

16 1.31 348 

Methyl Alcohol - CH 3 

OH 32 1.20 337 

Methyl Chloride - CH 3 

Cl 50.5 1.20 337 

Methyl Mercaptan - CH 4 

S 48.1 1.20 337 

N-Butane - C 4 

H 10 

58 1.11 328 

Natural Gas 19 1.27 345 

Nitrogen - N 2 

28 1.40 356 

Oxygen - O 2 

32 1.40 356 

Pentane - C 5 

H 12 

72 1.09 325 

Propane - C 3 

H 8 

44 1.13 330 

Propylene - C 3 

H 6 

42 1.15 332 

Sulphur Dioxide - SO 2 

64 1.28 345 

Water Vapor/Steam 18 1.30 347 

Specific 

Specific 

Heat Ratio 

Heat Ratio 

(Cp/Cv) C (Cp/Cv) C 

1.00 315 1.52 366 

1.02 318 1.54 368 

1.04 320 1.56 369 

1.06 322 1.58 371 

1.08 324 1.60 372 

1.10 327 1.62 374 

1.12 329 1.64 376 

1.14 331 1.66 377 

1.16 333 1.68 379 

1.18 335 1.70 380 

1.20 337 1.72 382 

1.22 339 1.74 383 

1.24 341 1.76 384 

1.26 343 1.78 386 

1.28 345 1.80 387 

1.30 347 1.82 388 

1.32 349 1.84 390 

1.34 351 1.86 391 

1.36 352 1.88 392 

1.38 354 1.90 394 

1.40 356 1.92 395 

1.42 358 1.94 397 

1.44 359 1.96 398 

1.46 361 1.98 399 

1.48 363 2.00 400 

1.50 365 2.20 412 

F7000/8000 SERIES

F7000 GAS FLOW CAPACITIES 

10% / 3 psi Overpressure, 60 degF, Z=1.0, MW=29 

VA L VE SIZE 1 x 2 1-1/2x3 2x3 3x4 4x6 6x8 8x10 12x16 

ORIFICE AREA(in 2 ) 0.719 1.767 2.953 6.605 11.437 26.06 45.66 111.87 

K 0.824 0.824 0.824 0.824 0.824 0.824 0.824 0.824 

AIR 

Set Pr essur e 

(psig) SCFM SCFM SCFM SCFM SCFM SCFM SCFM SCFM 

15 355 872 1458 3261 5646 12865 22541 55227 

20 409 1006 1681 3759 6509 14832 25988 63672 

25 464 1139 1904 4258 7373 16799 29435 72117 

30 518 1272 2127 4756 8236 18767 32881 80561 

40 637 1566 2617 5853 10135 23094 40464 99139 

50 757 1859 3107 6950 12035 27422 48047 117717 

75 1055 2593 4333 9692 16783 38241 67003 164162 

100 1354 3327 5559 12435 21531 49061 85960 210607 

150 1951 4794 8011 17919 31028 70699 123873 303498 

200 2548 6261 10463 23403 40525 92338 161787 396388 

250 3145 7728 12915 28888 50021 113977 199700 489278 

285 3563 8755 14632 32727 56669 129124 226239 554301 

290 3622 8902 14877 33275 57618 131288 230031 563590 

300 3742 9195 15367 34372 59518 135615 237613 

400 4936 12130 20271 45341 78511 178893 313440 

500 6130 15064 25175 56310 97504 222170 389267 

600 7324 17999 30079 67279 116497 265448 465093 

700 8518 20933 34983 78247 135491 308725 540920 

740 8995 22107 36945 82635 143088 326036 571251 

750 9115 22400 37435 83732 144987 330364 578834 

800 9712 23868 39887 89216 154484 352002 616747 

900 10906 26802 44791 100185 173477 395280 692574 

1000 12100 29736 49695 111 154 192470 438557 768400 

1100 13294 32671 54599 122123 211464 481834 844227 

1200 14488 35605 59503 133091 230457 525112 920054 

1300 15682 38540 64407 144060 249450 568389 995880 

1400 16876 41474 69311 155029 268443 611666 1071707 

1480 17831 43822 73234 163804 283638 646288 1132369 

1500 18070 44409 74215 165998 287436 654944 1147534 

ORIFICE AREA 0.719 1.404 2.240 5.408 10.315 

1500 18070 35286 56296 135915 259238 

2000 24040 46944 74896 180819 344888 

2220 26667 52073 83079 200578 382574 

2250 27025 52773 84195 203272 387713 

ORIFICE AREA 0.521 1.404 2.240 5.408 10.315 

2300 20016 53938 86055 207762 396278 

2600 22611 60933 97215 234705 447667 

2900 25207 67928 108375 261648 499057 

3200 27803 74923 119535 288591 550447 

3500 30398 81917 130695 315534 601837 

3705 32172 86697 138320 333945 636953 

3750 32561 87746 139994 337986 644661 

ORIFICE AREA 0.521 0.950 1.774 

3800 32994 60161 112344 

4000 34724 63317 118236 

3 

Nm /hr = scfm 

4500 39050 71205 132966 

0.6218 

5000 43376 79093 147696 

5500 47702 86981 162426 

lb/hr air = 4.59 x (scfm) 

6000 52029 94870 177157 

21 

F7000/8000 SERIES

22 

AIR 

ORIFICE SIZE 

ORIFICE AREA (in 2) 

K 

Set Pressure 

(psig) 

D 

0.134 

0.878 

E 

0.235 

0.878 

F G H J K L 

0.588 0.916 1.503 2.147 

0.878 0.878 0.878 0.878 

0.358 

0.878 

SCFM SCFM SCFM SCFM SCFM SCFM SCFM SCFM SCFM SCFM SCFM SCFM SCFM SCFM SCFM 

15 70 124 188 309 482 791 1129 1724 2181 2638 3891 6793 9839 

20 81 143 217 357 556 912 1302 1987 2515 3041 4486 7831 11343 

25 92 161 246 404 629 1032 1475 2251 2849 3444 5081 8870 12848 

30 103 180 275 451 703 1153 1647 2515 3182 3847 5676 9908 14352 

40 127 222 338 555 865 1419 2027 3094 3916 4735 6985 12193 17662 

50 150 263 401 659 1027 1685 2407 3674 4650 5622 8294 14478 20971 

75 210 367 560 919 1432 2350 3357 5124 6484 7840 11566 20191 29246 

100 269 471 718 1180 1837 3015 4307 6574 8319 10058 14838 25903 37520 

150 387 679 1035 1700 2648 4345 6206 9473 11988 14494 21383 37328 54068 

200 506 887 1352 2220 3458 5675 8106 12372 15657 18930 27927 48753 70617 

250 624 1095 1668 2740 4269 7004 10006 15272 19326 23367 34472 60178 87165 

285 707 1241 1890 3104 4836 7935 11335 17301 21894 26472 39053 68175 98749 

300 743 1303 1985 3260 5079 8334 11905 18171 22995 27803 41016 71603 103714 168618 

400 980 1719 2619 4301 6700 10994 15704 23970 30333 36675 54106 94452 136811 222427 

500 1217 2135 3252 5341 8321 13653 19503 29768 37671 45547 67195 117302 169908 276236 

600 1454 2551 3886 6382 9942 16313 23303 35567 45010 54420 80284 140152 203005 330045 

700 1691 2966 4519 7422 11563 18972 27102 41366 52348 63292 93373 163002 236102 383855 

740 1786 3133 4772 7839 12211 20036 28621 43685 55283 66841 98608 172141 249340 405378 

750 1810 3174 4836 7943 12373 20302 29001 44265 56017 67728 99917 174426 252650 410759 

800 1929 3382 5153 8463 13184 21632 30901 47164 59686 72164 106462 185851 269199 437664 

900 2166 3798 5786 9503 14804 24292 34700 52963 67024 81037 119551 208701 302296 491473 

1000 2403 4214 6420 10544 16425 26951 38499 58762 74362 89909 132640 231551 335393 545282 

1100 2640 4630 7053 11584 18046 29611 42298 64561 81700 98781 145729 254400 368490 599091 

1200 2877 5046 7686 12625 19667 32270 46097 70359 89039 107654 158818 277250 401586 652900 

1300 3114 5461 8320 13665 21288 34930 49897 76158 96377 116526 171907 300100 434683 706709 

1400 3351 5877 8953 14706 22909 37589 53696 81957 103715 125398 184996 322950 467780 760518 

1480 3541 6210 9460 15538 24206 39717 56735 86596 109586 132496 195468 341229 494258 803566 

1500 3588 6293 9587 15746 24530 40249 57495 87755 111053 134271 198085 345799 500877 814327 

2000 4774 8372 12754 20949 32634 53547 76491 116749 147744 178632 263531 

2220 5296 9287 14148 23238 36200 59398 84849 129506 163888 198152 292327 

2250 5367 9412 14338 23550 36686 60196 85988 131245 166089 200813 296254 

2300 5485 9620 14655 24070 37497 61526 87888 134145 169759 205249 302798 

2600 6197 10867 16555 27191 42359 69504 99285 151541 191773 231866 342065 

2900 6908 12115 18456 30313 47222 77483 110683 168937 213788 258483 381333 

3200 7619 13362 20356 33434 52085 85462 122080 186333 235802 285100 420600 

3500 8331 14610 22257 36556 56947 93441 133478 203729 257817 311717 459867 

3705 8817 15462 23555 38689 60270 98893 141266 215616 272860 329906 486700 

3750 8923 15649 23840 39157 60999 100090 142976 218226 276162 333898 492590 

3800 9042 15857 24157 39677 61810 101419 

4000 9516 16689 25424 41758 65052 106739 

4500 10702 18768 28592 46960 73156 120036 

5000 11887 20847 31759 52163 81260 133334 

5500 13073 22927 34926 57365 89365 146632 

6000 14259 25006 38094 62567 97469 159930 

F8000 (API) GAS FLOW CAPACITIES 


3.277 

0.878 

M 

4.147 

0.878 

N P Q R T W 

7.397 12.913 18.704 30.409 

0.878 0.878 0.878 0.878 

5.014 

0.878 

78.81 

0.878 

15996 41456 

18442 47795 

20888 54134 

23334 60473 

28714 74418 

34095 88364 

47548 123228 

61000 158092 

87905 227819 

114809 297547 

141714 367274 

160547 416084 

290 719 1261 1922 3156 4917 8068 11525 17591 22261 26915 39708 69318 100404 163237 423057 

3 

Nm /hr = scfm 

0.6218 

lb/hr air = 4.59 x (scfm) 

F7000/8000 SERIES

24 

NATURAL GAS 

F8000(API) GAS FLOW CAPACITIES 


ORIFICE SIZE D E F G H J K L M N P Q R T W 

ORIFICE AREA (in 2) 

0.134 0.235 0.358 0.588 0.916 1.503 2.147 3.277 4.147 5.014 7.397 12.913 18.704 30.409 78.81 

K 

0.878 0.878 0.878 0.878 0.878 0.878 0.878 0.878 0.878 0.878 0.878 0.878 0.878 0.878 0.878 

Set Pressure 

(psig) 

SCFM SCFM SCFM SCFM SCFM SCFM SCFM SCFM SCFM SCFM SCFM SCFM SCFM SCFM SCFM 

15 84 148 225 370 577 947 1352 2064 2612 3158 4659 8133 11780 19151 49634 

20 97 171 260 427 665 1091 1559 2379 3011 3641 5371 9376 13581 22080 57224 

25 110 193 294 484 753 1236 1766 2695 3410 4123 6083 10620 15382 25008 64813 

30 123 216 329 540 842 1381 1972 3011 3810 4606 6796 11863 17183 27937 72402 

40 151 

3800 

266 405 665 1036 1699 2427 3705 4688 5669 8363 14599 21146 34379 89099 

50 180 315 481 789 1230 2018 2882 4399 5567 6731 9930 17335 25108 40821 105795 

75 251 440 670 1101 1715 2814 4019 6135 7763 9386 13848 24174 35015 56927 147537 

100 322 564 860 1412 2200 3610 5156 7870 9960 12042 17765 31013 44921 73033 189278 

150 464 813 1239 2035 3170 5202 7431 11342 14353 17353 25601 44692 64734 105245 272761 

200 606 1062 1618 2658 4141 6794 9705 14813 18746 22665 33437 58370 84547 137457 356243 

250 748 1311 1997 3281 5111 8386 11979 18284 23138 27976 41272 72049 104360 169669 439726 

285 847 1485 2263 3717 5790 9501 13571 20714 26213 31694 46757 81624 118229 192218 498164 

290 861 1510 2301 3779 5887 9660 13799 21061 26653 32225 47541 82992 120211 195439 506512 

300 890 1560 2377 3904 6081 9978 14254 21756 27531 33287 49108 85728 124173 201881 

400 1173 2058 3135 5149 8022 13162 18802 28698 36317 43910 64779 113085 163799 266305 

500 1457 2556 3894 6395 9962 16347 23351 35641 45103 54532 80450 140442 203425 330729 

600 1741 3054 4652 7641 11903 19531 27899 42583 53889 65155 96121 167799 243051 395153 

700 2025 3552 541 8887 13844 22715 32448 49526 62674 75777 111792 195156 282677 459577 

740 2139 3751 5714 9385 14620 23989 34267 52303 66189 80027 118061 206099 298527 485346 

750 2167 3801 5790 9509 14814 24307 34722 52997 67067 81089 119628 208835 302490 491789 

800 2309 4049 6169 10132 15784 25899 36997 56468 71460 86400 127463 222514 322303 524001 

900 2593 4547 6927 11378 17725 29084 41545 63411 80246 97023 143134 249871 361929 588425 

1000 2877 5045 7686 12624 19666 32268 46094 70354 89032 107645 158806 277228 401555 652848 

1100 3161 5543 8444 13869 21606 35452 50642 77296 97817 118268 174477 304585 441181 717272 

1200 3445 6041 9203 15115 23547 38636 55191 84239 106603 128890 190148 331943 480807 781696 

1300 3729 6539 9961 16361 25487 41820 59740 91181 115389 139513 205819 359300 520432 846120 

1400 4012 7037 10720 17607 27428 45005 64288 98124 124175 150135 221490 386657 560058 910544 

1480 4240 7435 11326 18603 28981 47552 67927 103678 131203 158633 234027 408543 591759 962083 

1500 4296 7535 11478 18852 29369 48189 68837 105067 132960 160758 237161 414014 599684 974968 

2000 5716 10024 15270 25081 39072 64110 91580 139780 176889 213871 315517 

2220 6340 11199 16939 27822 43341 71115 101587 155053 196218 237240 349993 

2250 6425 11269 17167 28195 43923 72071 102951 157136 198854 240427 354695 

2300 6567 11517 17546 28818 44894 73663 105225 160607 203246 245738 362530 

2600 7419 13011 19821 32555 50715 83215 118871 181435 229604 277606 409544 

2900 8271 14505 22096 36293 56537 92768 132517 202263 255961 309474 456557 

3200 9122 15998 24372 40030 62359 102321 146163 223091 282318 341342 503571 

3500 9974 17492 26647 43767 68181 111873 159809 243918 308675 373209 550584 

3705 10556 18512 28202 46321 72159 118041 169133 258151 326686 394985 582710 

3750 10684 18737 28543 46881 73033 119834 171180 261275 330640 399766 589762 

10826 18985 28923 47504 74003 121426 

4000 11394 19981 30439 49995 77884 127795 

4500 12813 22471 

34232 56224 87587 143716 

5000 14232 24960 38024 62453 97290 159637 

5500 15652 27449 41816 68681 106993 175558 

6000 17071 29939 45608 74910 116697 191479 

3 

Nm /hr = scfm 

0.6218 

lb/hr nat. gas = 3.00 x (scfm) 

F7000/8000 SERIES

F7000 LIQUID FLOW CAPACITIES 

10% / 3 psi Overpressure, 70 degF, G = 1 WATER 

VALVE SIZE 1 x 2 1-1/2x3 2x3 3x4 4x6 6x8 8x10 12x16 

ORIFICE AREA(in 2 ) 0.719 1.767 2.953 6.605 11.437 26.06 45.66 111.87 

K 0.634 0.634 0.634 0.634 0.634 0.634 0.634 0.634 

Set Pressure 

(psig) GPM GPM GPM GPM GPM GPM GPM GPM 

15 73 181 302 675 1169 2664 4667 11435 

20 83 204 341 763 1321 3011 5276 12926 

25 92 225 376 842 1458 3322 5821 14262 

30 100 245 409 914 1583 3607 6319 15483 

40 115 282 472 1056 1828 4165 7297 17878 

50 128 316 528 1180 2043 4656 8158 19988 

75 157 387 646 1445 2503 5703 9992 24480 

100 182 446 746 1669 2890 6585 11537 28267 

150 223 547 914 2044 3539 8065 14130 34620 

200 257 631 1055 2360 4087 9312 16316 39976 

250 287 706 1180 2639 4569 10412 18242 44694 

285 307 754 1260 2818 4879 11116 19477 47721 

290 309 760 1271 2842 4921 11214 19647 48137 

300 315 773 1292 2891 5005 11405 19983 

400 363 893 1492 3338 5780 13170 23075 

500 406 998 1668 3732 6462 14724 25798 

600 445 1094 1828 4088 7079 16129 28261 

700 481 1181 1974 4416 7646 17422 30525 

740 494 1215 2030 4540 7861 17913 31385 

750 498 1223 2043 4571 7914 18033 31596 

800 514 1263 2110 4720 8174 18625 32632 

900 545 1339 2238 5007 8670 19754 34612 

1000 575 1412 2360 5278 9139 20823 36484 

1100 603 1481 2475 5535 9585 21839 38265 

1200 629 1547 2585 5781 10011 22810 39966 

1300 

1400 

1480 

699 1718 2871 6421 11118 25332 44385 

1500 704 1729 2890 6464 11192 25503 44684 

ORIFICE AREA 0.719 1.404 2.240 5.408 10.315 

1500 704 1374 2192 5292 10094 

2000 

812 1587 2531 6111 11656 

2220 

856 1672 2667 6438 12280 

2250 862 1683 2685 6482 12363 

ORIFICE AREA 0.521 1.404 2.240 5.408 10.315 

2300 631 1701 2714 6553 12500 

2600 671 1809 2886 6968 13290 

lpm = 3.785 x (gpm) 

2900 709 1910 3048 7359 14036 

lph = 227.1 x (gpm) 

3200 

745 2007 3202 7730 14744 

3500 

779 2099 3349 8084 15420 

3705 

801 2159 3445 8318 15865 

3750 806 2172 3466 8368 15961 

ORIFICE AREA 0.521 0.950 1.774 

3800 812 1480 2763 

4000 833 1518 2835 

4500 

5000 

5500 

6000 

655 

680 

883 

931 

976 

1020 

1610 

1671 

1610 

1697 

1780 

1859 

2690 

2792 

3007 

3170 

3324 

3472 

6017 

6245 

* Caution: Use only modulating pilots for liquid service 

10420 

10813 

23742 

24638 

41598 

43169 

25 

F7000/8000 SERIES

PART NUMBERING 

The following part numbering system is to be used when ordering 

a FLOW SAFE F7000 or F8000, with F200, F300, or F500 Pilot Valves: 

26 

VALVE TYPE 

PILOT VALVE TYPE 

SOFTGOODS 

FLOW AREA 

ASME PRESSURE CLASS 

7 2 5 0 05 03 04 F S1 F 

ACCESS 

MATERIAL 

7 Full Bore 

8 Reduced Bore 

2 F200 (Gas Only) 

3 F300 (Gas or Liquid) 

5 F500 (Gas or Liquid) 

4 Plastic 

5 Elastomer (O-Ring) 

0 Full Bore 

D thru W API Orifice 

00 FNPT 

05 Class 150 

10 Class 300 

12 Class 600 

14 Class 900 

16 Class 1500 

18 Class 2500 

S Special D Closed dome tee 

F Filter 

SO NO solenoid valve 

R Remote sense SC NC solenoid valve 

M 

CB 

Manual blowdown 

Cryo block 

S1 Standard (Stainless Trim) 

SS All Stainless 

N1 NACE Standard (Stainless Trim) 

NS NACE (All Stainless) 

X Duplex SS 

SP Special 

INLET FACING 

F 

R 

T 

S 

Raised face 

RTJ 

Screwed 

Special 

L Reflange hub 

G Grayloc hub 

FF Flat face 

OUTLET 

02 thru 16 Outlet, Inches 

INLET 

EXAMPLES: 

DESCRIPTION 

1. 4"x 6", Modulating-type (non-flowing) Pilot 

Valve; Set Pressure=600 psig, Natural Gas 

Service, Carbon Steel, NACE, 300# RF Inlet, 

150# RF Outlet, ‘M’ Orifice, Buna-N Seals, Filter 

2. 3"x4", Snap-Acting-type Pilot Valve; Set 

Pressure=75 psig, Cryogenic N2 Service, 

Stainless Steel, 150# RF Inlet, 150# RF 

Outlet, Full Bore, Teflon Main Valve Seat 

01 thru 12 Inlet, Inches 

3. 1-1/2"x3", Modulating-type (flowing) Pilot Valve; 

Set Pressure=50 psig, 60F , Fresh Water 

Service, Stainless Steel, 1-1/2" FNPT Inlet, 

3" FNPT Outlet, ‘G’ Orifice, Teflon Seat 

DESIGNATION 

855M100406FN1F@600 psig 

with Buna-N Seat & Seals 

DESIGNATION 

7240050304FSS@75 psig 

with Teflon Seat 

DESIGNATION 

834G001503TSS@50 psig 

with Teflon Seat 

F7000/8000 SERIES

COMPANY ____________________________ 

REF. NO. ______________________________ 

FLOW SAFE REF. NO. __________________ 

SPECIFICATION SHEET AND ORDER FORM 

PLEASE ANSWER ALL QUESTIONS 

SKETCH AREA/COMMENTS 

VA LVE SELECTION SER VICE CONDITIONS 

TAG NO. 

QTY. 

SERVICE MEDIA 

MOLECULAR WEIGHT (M) 

SPECIFIC GRAVITY 

/ Delivery Request: _____ weeks 

COMPRESSIBILITY FACTOR (Z) 

VISCOSITY 

REQUIRED 

CAPACITY 

SET 

PRESSURE 

SCFM (NM /HR) 

LB/HR. (KG/HR) 

GPM (LPM) 

PSIG 

BARG 

ALLOWABLE OVERPRESSURE % 

REQUIRED BLOWDOWN % 

BACKPRESSURE PSIG BARG 

RELIEVING TEMPERATURE F C 

REQD CLEAN LEVEL LOX GOX 

BODY MATERIAL 

SEAT & SOFT GOODS 

TRIM MATERIAL 

OPTION NUMBERS 

SIZE & ASME CLASS INLET/OUTLET 

SPECIAL INLET/OUTLET 

FLANGE FACING RF RTJ 

ORIFICE SELECTED 

VALVE ASSEMBLY NUMBER 

ACCESSORIES 

MODIFICATIONS 

3 

ORIFICE CALCULATED 

27 

PHOTOCOPY FOR YOUR RECORDS — SEND OR FAX COPY TO FLOW SAFE INC, 

OR YOUR AUTHORIZED REPRESENTATIVE 

"Experts in Soft-Seated Valve Technology" 

F7000/8000 SERIES

F7000/8000 Series 

Safety Relief V alve – 

IM Constructio n 

F84/85 Series 

Safety Relief Va lv e 

F70U Series 

Unloader Va lv e 

F88 Series 

Balanced Safety 

Relief Valve 

(Gas or Liquid) 

F70PR Series 

Pressure Relief V alve 

F84L Series 

Liquid Relief Va lv e 

, IN C 

YOUR AUTHORIZED REPRESENT A TIVE : 

S-3865 T aylor Road 

Or char d Park, NY 14127 

Sales, Service - (716) 662-2585 

Fax - (716) 662-2580 

Literature, sizing, IOM's - 

For Quotations - 

www .flowsafe.com 

info@flowsafe.com

Catalog - Tri-State Technical Sales Corp.

Create successful ePaper yourself

Delete template?

Save as template?