About Pressure-Relief Valves
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About Gas Regulators
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High-Purity Tank-Mount Pressure-Regulating Valves for Fuel Gases
- For Use With: Hydrogen, Methane
- Temperature Range: -20° to 120° F
Designed to reduce contaminants in high-purity applications using hydrogen and methane gas, these valves have a stainless steel and brass body with a smooth finish to reduce dust collection and internal components designed to protect the seal and diaphragm from contamination. They’re often used in research sample systems, emission monitoring systems, and chromatography. Valves automatically reduce a high inlet pressure from compressed gas tanks to a lower, stable outlet pressure. All have Compressed Gas Association (CGA) numbered inlet fittings for secure connections to compressed gas tanks. Choose a valve with the same CGA number as your tank and other system components. Outlet fittings are Swagelok® for a leak-free seal around hard metal tubing in high-pressure lines. Also known as instrumentation fittings, Swagelok® fittings are compatible with Parker A-Lok, Gyrolok, Bilok, and Tylok fittings. Valves come with a gauge to monitor outlet pressure and a gauge to monitor inlet pressure from the tank.
Choose a valve with a maximum outlet pressure that’s approximately twice your application’s normal operating pressure. Your operating pressure should never exceed 75% of the valve’s maximum outlet pressure.
Single-stage valves reduce pressure in one step, which causes the outlet pressure to fluctuate slightly as you empty the tank. They’re best for applications where a constant outlet pressure isn’t critical.
Two-stage valves progressively reduce pressure over two steps for more consistent outlet pressure at all times. They’re often used in applications that require a constant outlet pressure regardless of the tank level.
Inlet | Outlet | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| CGA Number  | Location | Thread Direction | Pressure Gauge Range, psi | Stage | For Tube OD | Location | Pressure Range, psi | Pressure Adjustment Method | Each | |
Swagelok® Female Outlet × NGO Female Inlet | ||||||||||
Brass/Stainless Steel Body—316 Stainless Steel Diaphragm and PTFE Seal with Relief Valve | ||||||||||
| CGA 350 | Side | Left Hand | 0 to 4,000 | Single | 1/4" | Side | 0 to 15 | Knob | 0000000 | 0000000 |
| CGA 350 | Side | Left Hand | 0 to 4,000 | Single | 1/4" | Side | 0 to 125 | Knob | 0000000 | 000000 |
| CGA 350 | Side | Left Hand | 0 to 4,000 | Two | 1/4" | Side | 0 to 15 | Knob | 0000000 | 000000 |
| CGA 350 | Side | Left Hand | 0 to 4,000 | Two | 1/4" | Side | 0 to 125 | Knob | 0000000 | 000000 |
| CGA 350 | Side | Left Hand | 0 to 4,000 | Two | 1/4" | Side | 0 to 500 | Knob | 0000000 | 000000 |
Tank-Mount Pressure-Regulating Valves for Fuel Gases
- For Use With: See Table
- Temperature Range: -20° to 120° F
Attach these valves to acetylene, hydrogen, methane, propane, or propylene tanks to reduce a high inlet pressure to a lower, stable outlet pressure. They have Compressed Gas Association (CGA) numbered inlet fittings for secure connections to compressed gas tanks. Choose a valve with the same CGA number as your tank and other system components. Valves come with a gauge to monitor outlet pressure and a gauge to monitor inlet pressure from the tank.
Choose a valve with a maximum outlet pressure that’s approximately twice your application’s normal operating pressure. Your operating pressure should never exceed 75% of the valve’s maximum outlet pressure.
Two-stage valves progressively reduce pressure over two steps for more consistent outlet pressure at all times. They’re often used in applications that require a constant outlet pressure regardless of the tank level.
Valves with a brass body have a longer service life than valves with a brass and steel body.
Inlet | Outlet | Material | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CGA Number | Location | Thread Direction | Pressure Gauge Range, psi | Thread Size | Location | Thread Direction | Pressure Range, psi | Body | Seal | Diaphragm | Each | |
For Use With Hydrogen and Methane | ||||||||||||
UNF Male Outlet × NGO Female Inlet | ||||||||||||
| CGA 350 | Side | Left Hand | 0 to 4,000 | 9/16"-18 | Side | Left Hand | 2 to 40 | Brass | Neoprene | Rubber | 0000000 | 0000000 |
ASME-Code Fast-Acting Pressure-Relief Valves for Cryogenic Fluids
- For Use With: Argon, Carbon Dioxide, Helium, Hydrogen, Methane, Nitrogen, Oxygen
- Specifications Met: ASME BPVC.VIII
- Temperature Range: -320° to 150° F
These valves meet ASME Code Section VIII for use with cryogenic pressure vessels. Rated for use with argon, carbon dioxide, helium, hydrogen, methane, nitrogen, and oxygen, they are cleaned and bagged for oxygen service and other high-purity applications. All spring fully open at the set pressure and remain open until the system pressure is restored below the set pressure. Attach a drain line to the threaded relief port for remote discharge.
For technical drawings and 3-D models, click on a part number.