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 Model Number |
V33 |
Features
- Fixed and adjustable cracking pressure
- Reliable DK-LOK Tube Fitting, NPT and ISO pipe end connections
- Stainless and Brass material construction
Technical Information
Valve Series |
V33 Series |
VP33 Series |
VA33 Series |
VH36 Series |
V33A, V33B, V33C and V33C |
V33E and V33F |
VP33A and VP33B |
VA33 and VA33B |
VH36A and VH36B |
VH36C |
Maximum Operating Pressure @21°C (70°F) |
SS316 & Brass 3000 psi (206 bar) |
SS316: 2000 psi (137 bar) Brass :150 0 ps i(103 bar) |
SS316 & Brass 3000 psi (206 bar) |
SS316 & Brass 3000 psi (206 bar) |
SS316 6000 psi (413 bar) |
SS316 5000 psi (344 bar) |
Operating Temperature Ratings |
Viton O-ring: - 28°C to 204°C (-18°F to 399°F)
NBR O-ring: -20°C to 105°C (-4°F to 221°F) |
Nominal Cracking Pressure |
Refer to spring table of each valve sereis |
Cracking, Reseal and Back Pressure @ 20°C (70°F)
- Cracking Pressure
- The valve poppet is actuated when the pressure difference between the inlet and the outlet 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 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
- Ratings are based on Viton O-rings in S316 valves and NBR in Brass valves
Valve Series |
V33A, V33B, V33C, V33D,
VA33, and VP33 Series |
V33E and V33F Series |
SS316 VH36 Series |
Temperature |
Working Pressure, psig (bar) |
S316 |
Brass |
S316 |
Brass |
VH36A & VH36B |
VH36C |
-28 to 38°C (-18 to100°F) |
3000(206) |
3000(206) |
2000(137) |
1500(103) |
6000(413) |
500(344) |
93°C (200°F) |
2575(177) |
2600(179) |
1715(118) |
1300(89) |
5160(355) |
4290(295) |
175°C (225°F) |
2510(172) |
2500(172) |
1670(115) |
1250(86) |
5030(346) |
4180(288) |
121°C (250°F) |
2450(168) |
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1630(112) |
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4910(338) |
4080(281) |
148°C (300°F) |
2325(160) |
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1545(106) |
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4660(321) |
3875(267) |
176°C (350°F) |
2255(155) |
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1490(102) |
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4470(308) |
3720(256) |
190°C (375°F) |
2185(150) |
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1450(99) |
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4375(301) |
3640(250) |
204°C (400°F) |
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4280(294) |
3560(245) |
Operation
- When the valve is not actuated for a period of time, it may require a higher cracking pressure than the set cracking pressure.
- D-Pro check valves prevent reverse flow in circuits. Do not use them as relief valves.
- D-Pro check valves are designed to prevent loss of media caused by failed connections and for uni-directional flow
control of fluids as well as gases in chemical processing, power generation, oil and gas industries.
Valve Cleaning and Factory Test
Every component is cleaned, and packed in a plastic sealing bag to keep them from dust in the air, and then boxed for protection from damage during transportation and storage. E very valve is factory tested for cracking and re seals performance.
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