About Pressure-Relief Valves
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Pressure-Relief Valves for Cryogenic Applications
- For Use With: Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen
- Temperature Range: -320° to 165° F
Cleaned and bagged to meet CGA G-4.1 for oxygen service and other high-purity applications, these valves are built to withstand the extreme cold of liquid carbon dioxide, liquid nitrogen, and liquid oxygen. They begin opening at the set pressure and fully open at about 10% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. Set pressure is not adjustable.
Valves are not intended for direct contact with cryogenic liquids. Risers (sold separately) are required to convert cryogenic liquids into gases before they contact the valve. 3/8 NPT valve requires a 1/2 NPT × 3/8 NPT bushing when using a riser.
Adapters (sold separately) convert the valve relief-port connection from UNEF female threads to NPT female threads.
For technical drawings and 3-D models, click on a part number.
Valves | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Inlet | Relief Port | Risers | Adapters | |||||||||
| Pipe Size  | Location | Maximum Pressure, psi | Thread Size | Location | Overall Ht. | Choose a Set Pressure, psi | Each | Each | Each | |||
NPT Male Inlet and UNEF Female Relief Port | ||||||||||||
Brass Body | ||||||||||||
| 1/4 | Bottom | 600 | 3/4"-20 | Top | 2 5/8" | 00000000 | 000000 | 00000000 | 000000 | 00000000 | 000000 | |
| 3/8 | Bottom | 600 | 3/4"-20 | Top | 2 5/8" | 00000000 | 00000 | 00000000 | 00000 | 00000000 | 00000 | |
| 1/2 | Bottom | 600 | 3/4"-20 | Top | 2 13/16" | 00000000 | 00000 | 00000000 | 00000 | 00000000 | 00000 | |
Cleaned and Bagged Pressure-Regulating Valves for Air and Inert Gas
- For Use With: Nitrogen, Oxygen, Argon, Helium, Neon
- Temperature Range: -40° to 165° F
Often used for oxygen service and other high-purity applications, these valves are cleaned and bagged to meet CGA G-4.1 standards to prevent contamination. They automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range. Valves have two gauge ports. They are no-bleed style, so they keep process gases contained in the valve.
For technical drawings and 3-D models, click on a part number.
Inlet | Outlet | Gauge Port | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Location | Max. Pressure, psi | Pipe Size | Location | Pipe Size | Location | End-to-End Lg. | Choose an Outlet Pressure Range, psi | Each | |
NPT Female | ||||||||||
Brass Body—Buna-N Diaphragm and Fluoroelastomer Seal | ||||||||||
| 1/2 | Side | 500 | 1/2 | Side | 1/4 | Side | 2 13/16" | 00000000 | 0000000 | |
| 3/4 | Side | 500 | 3/4 | Side | 1/4 | Side | 3 5/16" | 00000000 | 000000 | |
| 1 | Side | 500 | 1 | Side | 1/4 | Side | 3 5/16" | 00000000 | 000000 | |