PVRV prod pgs rev 1-6/04

High Performance
Pressure Vacuum Relief Valve
Pipe Away, Model 850
The Model 850 is part of Enardo’s line of high
performance pressure vacuum relief valves. The model
850 was designed with features to exceed the
performance of standard valves on the market.
Standard features include:
• The only dual guided (top and bottom) pallet for
smoother valve stroke, less flutter and valve wear,
• Polyphenylene Sulfide(PPS), advanced composite
thermoplastic material for seat and pallet providing
superior resistance to corrosion, chemical attack,
liquid and vapor adhesion, temperature extremes
(-50° F to 500° F) and sticking due to valve seat
freeze.
• Fully field replaceable pallet and seat assemblies
without need for special tools or complex
procedures which eliminates the need to send out
for rebuilding or total valve replacement. (Can be
maintained by in house maintenance personnel)
The model 850 pipe away design maintains a tight
seal until system pressure or vacuum exceed the set
pressure of the valve. When overpressure occurs the
Features and Benefits
• Advanced composite thermoplastic (PPS) materials
for seat and pallet provide superior resistance to
corrosion, chemical attack, liquid and vapor
adhesion, temperature extremes (-50° F to 500° F)
and sticking due to valve seat freeze.
• Patented Saber Guide (U.S. Patent No. 591330)
valve system provides for smooth valve stroke
during operation and reduces valve wear.
Valve Setting Range
Materials of Construction
ENARDO
PVRV
weighted pallet lifts, breaking the seal between the
seat and pallet, allowing vapors to pass through the
valve orifice and relieving the pressure or vacuum
buildup. The valve reseals upon relief and remains
sealed.
• Exceeds the most stringent standards for allowable
leakage (1 scfh @ 90% set point per valve) and
provides excellent set point accuracy (+/-3%).
• Fully field replaceable pallet and seat assemblies.
• Available in ANSI, DIN and JIS flanges.
Model Numbers Sizes Available Pressure Vacuum
Model 850 50 mm (2") through 0.5 to 32.0 oz/sq. in. (0.5 oz Increments) 0.5 to 32.0 oz/sq. in. (0.5 oz Increments)
300 mm (12") 1.0 to 55.0 inH2O (0.5 in. Increments) 1.0 to 55.0 inH2O (0.5 in. Increments)
(2.0 to 138.0 mbar - 2.2 mbar Increments) (2.0 to 138.0 mbar - 2.2 mbar Increments)
Housing Seat / Pallet Pallet Seal Hardware Weights Gaskets
Aluminum PPS FEP Teflon Zinc Plated C.S. Zinc Plated C.S. Buna-N
Ductile Iron 316 Stainless Steel Buna-N Stainless Steel Stainless Steel Teflon
Stainless Steel Viton Vinyl Ester FRP Lead Viton
Carbon Steel
FRP
Resin Coated S.S.
ENARDO, Inc. • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com PVRV 15

16 PVRV
ENARDO
PVRV
Model 850 Dimensions and Weights
High Performance
Pressure Vacuum Relief Valve
Pipe Away, Model 850
A B C D E F Ductile Stainless
Inlet Outlet Overall Overall Overall CL CL CL Aluminum Iron Steel
Model Conn. Conn. Length Width Height Inlet I/O I/V Unit Unit Unit
mm (In.) mm (In.) mm (In.) mm (In.) mm (In.) mm (In.) mm (In.) mm (In.) kg (Lb.) kg (Lb.) kg (Lb.)
850 50 (2) 80 (3) 419 (16-1/2) 232 (9-1/8) 381 (15) 140 (5-1/2) 191 (7-1/2) 189 (7-7/16) 13 (29) 34 (74) 36 (80)
850 80 (3) 80 (3) 419 (16-1/2) 232 (9-1/8) 394 (15-1/2) 140 (5-1/2) 203 (8) 189 (7-7/16) 14 (31) 36 (79) 39 (85)
850 80 (3) 100 (4) 419 (16-1/2) 232 (9-1/8) 394 (15-1/2) 144 (5-11/16) 203 (8) 189 (7-7/16) 15 (33) 38 (83) 41 (90)
850 100 (4) 150 (6) 562 (22-1/8) 279 (11) 495 (19-1/2) 169 (6-21/32) 241 (9-1/2) 249 (9-13/16) 26 (57) 60 (133) 65 (144)
850 150 (6) 150 (6) 568 (22-3/8) 279 (11) 552 (21-3/4) 159 (6-1/4) 302 (11-7/8) 254 (10) 28 (62) 65 (144) 70 (155)
850 150 (6) 200 (8) 619 (24-3/8) 349 (13-3/4) 552 (21-3/4) 219 (8-5/8) 330 (13) 254 (10) 32 (70) 75 (165) 81 (178)
850 200 (8) 250 (10) 908 (35-3/4) 410 (16-1/8) 705 (27-3/4) 267 (10-1/2) 343 (13-1/2) 435 (17-1/8) 73 (161) 202 (446) 220 (485)
850 250 (10) 250 (10) 908 (35-3/4) 410 (16-1/8) 743 (29-1/4) 267 (10-1/2) 387 (15-1/4) 435 (17-1/8) 75 (166) 211 (466) 228 (503)
850 250 (10) 300 (12) 946 (37-1/4) 410 (16-1/8) 743 (29-1/4) 305 (12) 387 (15-1/4) 435 (17-1/8) 78 (172) 220 (486) 238 (525)
850 300 (12) 300 (12) 368 (14-1/2) 527 (20-3/4) 951 (37-7/16) 305 (12) 602 (23-11/16) 484 (19-1/16) 79 (175) 225 (495) 241 (532)
850 300 (12) 350 (14) 1154 (45-7/16) 610 (24) 1006 (39-5/8) 406 (16) 694 (27-5/16) 484 (19-1/16) 94 (208) 263 (579) 282 (622)
Unit weights indicate Net Weight of valve in pounds at standard set pressure (0.5 oz/sq.in. pressure - 0.5 oz/sq.in.
vacuum), does not include shipping crate or box. Add 20% for gross shipping weight (Domestic Only).
Key to Enardo Pressure/Vacuum Relief Valve Model Number
850 — X —
/ —
Example:
Inlet
Connection
Size
(2" thru 12")
Outlet
Connection
Size
(3" thru 14")
Housing
Material
1.Aluminum
2.Ductile Iron
3.FRP
Composites
4.Stainless
Steel
5.Carbon Steel
Pallet & Seat
Ring Material
1.Advanced
Composite
(PPS)
2.316 Stainless
Steel
3.Other
Pallet Seal
Material
1.FEP Teflon
2.Buna-N
3.Viton
4.Other
Pressure
Settings
z - oz/sq.in.
n - inH2O
0.5 oz/sq.in. to
32.0 oz/sq.in.
(0.5 oz/sq.in.
increments)
1.0 inH2O to
55.0 inH2O
(0.5 inH2O
increments)
Vacuum
Settings
z - oz/sq.in.
n - inH2O
0.5 oz/sq.in. to
32.0 oz/sq.in.
(0.5 oz/sq.in.
increments)
1.0 inH2O to
55.0 inH2O
(0.5 inH2O
increments)
Options
O. No Options
A. Special Coating
B. S.S. Weights
C. Optional Weight
Material
D. Optional Hardware
E. Optional Gasket
Material
F. Opt. FRP Resins
G. Steam Jacket or
Trace
J. Other
850 — 2 X 3 — 5 2 1 n 12 / 6 — A B
Indicates a Pipe-Away pressure vacuum relief valve with 2" inlet by 3" outlet, ANSI 150 lb. raised face flange
pattern connections, carbon steel housing, stainless steel pallet and seat ring and FEP Teflon pallet seal. Pressure
setting is 12 inH2O and vacuum setting is 6 inH2O. Options include special external epoxy coating of valve and
stainless steel weights for relief settings.
ENARDO, Inc. • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com