About Pressure-Relief Valves
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About Gas Regulators
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Easy-Read Tank-Mount Pressure-Regulating
Valves with Flowmeter for Inert Gas
Flowmeters let you see the gas flow rate from a distance. These 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. They have a gauge for monitoring inlet pressure from the tank.
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.
Valves with one flowmeter are for one piece of equipment on a tank. The flowmeter has a single scale.
Adapters (sold separately) change 5/8"-18 outlets to 9/16"-18 male connections, and vice versa.
Inlet | Outlet | Material | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CGA Number  | Location | Thread Direction | Pressure Gauge Range, psi | Stage | Thread Size | Location | Thread Direction | Flow Range, scfh | Number of Flowmeters | Body | Seal | Diaphragm | Each | |
UNF Female Outlet × NGO Male Inlet | ||||||||||||||
| CGA 580 | Side | Right Hand | 0 to 4,000 | Single | 5/8"-18 | Side | Right Hand | 0 to 100 (Helium), 0 to 140 (Hydrogen) | 1 | Brass | PTFE | Neoprene | 000000000 | 0000000 |
| Optional Adapter | 00000000 | Each | 000000 |
Inlet | Outlet | Material | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CGA Number | Location | Thread Direction | Pressure Gauge Range, psi | Stage | Thread Size | Location | Thread Direction | Flow Range, scfh | Number of Flowmeters | Body | Seal | Diaphragm | Each | |
UNF Male Outlet × NGO Female Inlet | ||||||||||||||
| CGA 350 | Side | Left Hand | 0 to 3,000 | Single | 9/16"-18 | Side | Left Hand | 0 to 40 | 1 | Brass | PTFE | Neoprene | 000000000 | 0000000 |
| Optional Adapter | 00000000 | Each | 000000 |
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.
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.
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 | Pressure Adjustment Method | Body | Seal | Diaphragm | Each | |
For Use With Hydrogen | |||||||||||||
UNF Male Outlet × NGO Female Inlet | |||||||||||||
| CGA 350 | Side | Left Hand | 0 to 4,000 | 9/16"-18 | Side | Left Hand | 0 to 125 | T-Handle | Brass | PTFE | Rubber | 000000 | 0000000 |
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 |
Pressure-Regulating Valves for Fuel Gases
- For Use With: See Table
- Temperature Range: See Table
Install these valves directly in gas distribution pipelines for acetylene, hydrogen, or propane. They automatically reduce a high inlet pressure to a lower, stable outlet pressure. Valves have two outlets to fit various pipe configurations and come with a plug to close the unused outlet. The gauge monitors outlet pressure. All valves are single stage and reduce pressure in one step, which causes the outlet pressure to fluctuate.
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.
Inlet | Outlet | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Use With | Pipe Size | Location | Max. Pressure, psi | Pipe Size | Location | Pressure Adjustment Method | Pressure Gauge Range, psi | Temperature Range, ° F | End-to-End Lg. | Port-to-Port Lg. | Each | |
NPT Female | ||||||||||||
Brass Body—Stainless Steel Diaphragm and Neoprene Seal | ||||||||||||
| Hydrogen, Propane | 1/4 | Side | 500 | 1/4 | Bottom, Side | T-Handle | 0 to 60 | 0° to 120° | 2.40" | 1.01" | 0000000 | 0000000 |
| Hydrogen, Propane | 1/4 | Side | 500 | 1/4 | Bottom, Side | T-Handle | 0 to 200 | 0° to 120° | 2.40" | 1.01" | 0000000 | 000000 |
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.