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Features
Fixed cracking pressure valves: V33, VP33, VH36, VCH36 Series
Adjustable cracking pressure valves: VA33, VDA33 Series
Lift Check valves: VL36 Series
Poppet Check Valves, V33 Series
: 2 page
: 3 page
One-Piece Check Valves, VP33 Series
: 4, 5 page
One-Piece Adjustable Check Valves, VA33 Series
: 4, 5 page
In-Line Adjustable Check Valves, VDA33 Series
: 6, 7 page
High Pressure Check Valves, VH36 Series
: 6, 7 page
CNG/NGV Check Valves, VCH36 Series
: 8 page
Lift Check Valves, VL36 Series
Technical Information
Cracking, Reseal and Back Pressure @ 70 (21 )
Cracking Pressure
: Valve poppet is actuated when the pressure difference between the inlet (upstream) and the outlet (downstream) reaches
the range of cracking pressure.
Reseal Pressure
: Valves that have higher cracking pressure can be resealed to bubble-tight by the spring force.
The reseal pressure is the pressure at the same flow direction, but lower than the cracking pressure.
Back Pressure
:
Valves that have cracking pressure of 5 psig (0.34 bar) and lower may not be able to return to the bubble-tight seal.
This may require back pressure to press the seal to form a bubble-tight contact in addition to the spring force.
Class Ratings
Working Pressure, psig ( )
bar
3000 ( )
2575 ( )
2510 ( )
2450 ( )
2325 ( )
2255 ( )
2185 (
-
-
-
-
-
-
-
-
-
-
)
206
177
172
168
160
155
150
SS316
SS316
Brass
Brass
3000 ( )
2600 ( )
2500 (
(
)
206
179
172
2405 )
165
2000 ( )
1715 ( )
1670 ( )
1630 ( )
1545 ( )
1490 ( )
1450 ( )
137
118
115
112
106
102
99
1500 ( )
1300 ( )
1250 ( )
103
89
86
1200 ( )
82
6000 ( )
5160 ( )
5030 ( )
4910 ( )
4660 ( )
4470 ( )
4375 ( )
4280 ( )
413
355
346
338
321
308
301
294
5000 ( )
4290 ( )
4180 ( )
4080 ( )
3875 ( )
3720 ( )
3640 ( )
3560 ( )
344
295
288
281
267
256
250
245
V33A, V33B,
V33C, V33D
VP33A, VP33B,
VA33A, VA33B, VDA33
VH36A,
VH36B
VH36C
V33E, V33F
V33 Series
VP33, VA33, VDA33 Series
VH36 Series
Temperature, F ( C)
Valve Series
-18 to 100 (-28 to 38)
200 (93)
225 (175)
250 (121)
300 (148)
350 (176)
375 (190)
400 (204)
V33 Series
Valve Series
Materials
Unit: psi (bar)
Working Pressure
@70 F (21 C)
Temperature
Ratings
Cracking Pressure
V33A, V33B,
V33C, V33D
Seal Material
FKM O-ring
VT
EPDM O-ring
EP
-10 to 375
(-23 to 190) (a)
-50 to 300
(-45 to 148)
NBR O-ring
BN
FFKM O-ring
KZ
-10 to 250
(-23 to 121)
-22 to 410
(-30 to 210)
Designator
Rating
Seal Material
Designator
Rating
VA33A, VA33B,
VDA33
VH36A,
VH36B
VH36C
V33E, V33F
VP33A, VP33B
SS316 & Brass
3000
(206)
3000
(206)
3000
(206)
6000
(413)
5000
(344)
2000
(137)
1500
(103)
SS316 & Brass
SS316 & Brass
SS316
SS316
SS316
Brass
VP33 Series
VA33 & VDA33
Series
VH36 Series
Refer to spring table of each valve series
(a)VH36 Series with FKM O-ring: -10 to 400 F (-23 to 204 C)
FKM is standard for SS316 valves.
NBR is standard for Brass valves.
-
-
-
SS316
SS316
Brass
Brass
3000 ( )
)
2575 ( )
2510 ( )
2450 ( )
2325 ( )
2255 ( )
)
2185 (
206
177
172
168
160
155
150
3000 (
2600 ( )
2500 ( )
20
179
6
172
2405 ( )
165
F ( C)
Catalog No. V336-7
December 2011
Check Valves
V33, VP33, VA33, VDA33, VH36 and VL36 Series
VCH36 Series for CNG/NGV applications
Pressures up to 3000 psig (206 bar) and 6000 psig (413 bar)