Cryogenic Relief Valves | McMaster-Carr

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	For Use With For Use With

Liquid Argon

Liquid Carbon Dioxide

	Inlet Pipe Size Inlet Pipe Size

	Valve Function Valve Function

Pressure Relief

Pressure Regulation

	Inlet Thread Type Inlet Thread Type

NPT

	Minimum Temperature Minimum Temperature

-65° F or less

	Shape Shape


90° Elbow	Straight

	Valve Type Valve Type

Pop Safety

Pressure Regulator

Relief

	Body Material Body Material

Brass

Bronze

	Maximum Inlet Pressure Maximum Inlet Pressure

400 psi

600psi

	Set Pressure Configuration Set Pressure Configuration

Nonadjustable

	Relief Port Connection Type Relief Port Connection Type

Pipe

Vent

	Maximum Temperature Maximum Temperature

Less than 250° F

300° to 399.9° F

	Relief Port Pipe Size Relief Port Pipe Size

3/4

	Activation Activation

Pressure Driven

	Seal Material Seal Material

Rubber

Brass

Plastic

	Inlet Gender Inlet Gender

Male

Female

	Inlet Connection Style Inlet Connection Style

Threaded

	Inlet Location Inlet Location

Bottom

Side

	Inlet Connection Type Inlet Connection Type

	Pipe

	Overall Height Overall Height

	Relief Port Gender Relief Port Gender

Female

	Relief Port Location Relief Port Location

Side

Top

	Test Mechanism Test Mechanism

None

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15 Products

About Pressure-Relief Valves

For Use With: Liquid Argon, Liquid Carbon Dioxide, Liquid Helium, Liquid Hydrogen, Liquid Methane, Liquid Nitrogen, Liquid 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 liquid argon, liquid carbon dioxide, liquid helium, liquid methane, liquid nitrogen, and liquid 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.

Inlet			Relief Port
Pipe Size	Location	Maximum Pressure, psi	Pipe Size	Location	Overall Ht.	Valve Type	Choose a Set Pressure, psi		Each
NPT Male Inlet and NPT Female Relief Port
Brass Body and Seal
1/2	Bottom	600	3/4	Side	6 9/16"	Pop Safety	20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300	0000000	0000000
3/4	Bottom	600	1	Side	6 9/16"	Pop Safety	20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300	0000000	000000

Fast-Acting Pressure-Relief Valves for Cryogenic Liquids

For Use With: Liquid Argon, Liquid Nitrogen, Liquid Oxygen
Temperature Range: -320° to 350° F

Cleaned and bagged for oxygen service and other high-purity applications, these valves can withstand the extreme cold of liquid argon, liquid nitrogen, and liquid oxygen. They spring fully open at the set pressure and remain open until the system pressure is restored below the set pressure. All have a vented relief port to exhaust discharge directly.

For technical drawings and 3-D models, click on a part number.

Inlet
Pipe Size	Location	Maximum Pressure, psi	Relief Port Location	Overall Ht.	Valve Type	Choose a Set Pressure, psi		Each
NPT Male Inlet and Relief Vent
Brass Body—PTFE Seal
1/4	Bottom	400	Side	2 5/16"	Pop Safety	5, 10, 15, 20, 25, 30, 40, 50, 88, 100, 110, 125, 150, 200, 220, 250, 300, 325, 350, 400	0000000	000000

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"	22, 35, 50, 75, 100, 125, 150, 200, 250, 300, 350, 400, 450	00000000	000000	00000000	000000	00000000	000000
3/8	Bottom	600	3/4"-20	Top	2 5/8"	22, 35, 50, 75, 100, 125, 150, 200, 250, 300, 350, 400, 450	00000000	00000	00000000	00000	00000000	00000
1/2	Bottom	600	3/4"-20	Top	2 13/16"	22, 35, 50, 75, 100, 125, 150, 200, 250, 300, 350, 400, 450	00000000	00000	00000000	00000	00000000	00000

Extended-Life Pressure-Regulating
Valves for Cryogenic Liquids

For Use With: Liquid Argon, Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen
Temperature Range: -320° to 150° F

For a longer service life than standard valves for cryogenic liquids, these have a durable bronze body. All are cleaned and bagged for oxygen service and other high-purity applications. They automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range. Valves are designed to withstand the extreme cold of liquid argon, liquid carbon dioxide, liquid nitrogen, and liquid oxygen. They have an internal strainer to trap debris.

For technical drawings and 3-D models, click on a part number.

Inlet			Outlet
Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	End-to-End Lg.	Choose an Outlet Pressure Range, psi		Each
NPT Female
Bronze Body—Bronze Diaphragm and PTFE Seal with Internal Strainer
1/4	Side	400	1/4	Side	3 1/16"	10 to 30, 20 to 100, 50 to 200, 75 to 250	00000000	0000000
1/2	Side	400	1/2	Side	4 1/2"	10 to 30, 20 to 75, 20 to 100, 50 to 250	00000000	000000
1	Side	400	1	Side	5 7/8"	10 to 35, 20 to 60, 20 to 100, 75 to 250	00000000	000000

Pressure-Regulating Valves for Cryogenic Liquids

For Use With: Liquid Argon, Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen
Temperature Range: -320° to 150° F

These valves can withstand the extreme cold of liquid argon, liquid carbon dioxide, liquid nitrogen, and liquid oxygen. All are cleaned and bagged for oxygen service and other high-purity applications. They automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range.

For technical drawings and 3-D models, click on a part number.

Inlet			Outlet
Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	End-to-End Lg.	Choose an Outlet Pressure Range, psi		Each
NPT Female
Brass Body—Bronze Diaphragm and PTFE Seal
1/4	Side	600	1/4	Side	1 3/4"	15 to 65, 75 to 175, 100 to 250	00000000	0000000
3/8	Side	600	3/8	Side	1 3/4"	15 to 65, 75 to 175, 100 to 250	00000000	000000

About Pressure-Relief Valves

ASME-Code Fast-Acting Pressure-ReliefValves for Cryogenic Liquids

Fast-Acting Pressure-Relief Valves for Cryogenic Liquids

Pressure-Relief Valves for Cryogenic Applications

Extended-Life Pressure-RegulatingValves for Cryogenic Liquids

Pressure-Regulating Valves for Cryogenic Liquids

ASME-Code Fast-Acting Pressure-Relief
Valves for Cryogenic Liquids

Extended-Life Pressure-Regulating
Valves for Cryogenic Liquids