Cryogenic Relief Valves | McMaster-Carr

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13 Products

Pressure-Relief Valves for Cryogenic Applications

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.

Riser Tubes—Riser tubes (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—Adapters (sold separately) convert the valve relief-port connection from UNEF female threads to NPT female threads.

	Valves											Riser Tubes		Adapters
	Inlet			Relief
	Pipe Size	Location	Max. Pressure, psi	Port Thread Size	Port Location	Overall Ht.	For Use With	Temp. Range, ° F	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"	Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen	-320 to 165	22 , 35 , 50 , 75 , 100 , 125 , 150 , 200 , 250 , 300 , 350 , 400 , 450	49315K71	000000	49315K97	000000	49315K94	000000


				3/8	Bottom	600	3/4"-20	Top	2 5/8"	Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen	-320 to 165	22 , 35 , 50 , 75 , 100 , 125 , 150 , 200 , 250 , 300 , 350 , 400 , 450	49315K72	00000	49315K98	00000	49315K94	00000
				1/2	Bottom	600	3/4"-20	Top	2 13/16"	Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen	-320 to 165	22 , 35 , 50 , 75 , 100 , 125 , 150 , 200 , 250 , 300 , 350 , 400 , 450	49315K73	00000	49315K98	00000	49315K96	00000

Fast-Acting Pressure-Relief Valves for Cryogenic Liquids

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.

NPT Male Inlet and Relief Vent

Inlet
Pipe Size	Location	Max. Pressure, psi	Relief Port Location	Shape	Overall Ht.	For Use With	Temp. Range, ° F	Valve Type	Choose a Set Pressure, psi		Each







			Brass Body—PTFE Seal

			1/4	Bottom	400	Side	90° Elbow	2 5/16"	Liquid Argon, Liquid Nitrogen, Liquid Oxygen	-320 to 350	Pop Safety	5 , 10 , 15 , 20 , 25 , 30 , 40 , 50 , 88 , 100 , 110 , 125 , 150 , 200 , 220 , 250 , 300 , 325 , 350 , 400	9137K11	000000

Long-Life Pressure-Regulating Valves for Cryogenic Liquids

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.

	Inlet			Outlet
	Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Pressure Adjustment Method	End-to-End Lg.	For Use With	Temp. Range, ° F	Choose an Outlet Pressure, psi		Each
NPT Female







				Bronze Body—Bronze Diaphragm and PTFE Seal with Internal Strainer

				1/4	Side	400	1/4	Side	Screw	3 1/16"	Liquid Argon, Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen	-320 to 150	10 to 30 , 75 to 250	49165K39	0000000


				1/2	Side	400	1/2	Side	Screw	4 1/2"	Liquid Argon, Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen	-320 to 150	10 to 30 , 20 to 75 , 20 to 100 , 50 to 250	49165K59	000000
				1	Side	400	1	Side	Screw	5 7/8"	Liquid Argon, Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen	-320 to 150	10 to 35 , 20 to 60 , 20 to 100 , 75 to 250	49165K79	000000

Pressure-Regulating Valves for Cryogenic Liquids

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.

	Inlet			Outlet
	Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Pressure Adjustment Method	End-to-End Lg.	For Use With	Temp. Range, ° F	Choose an Outlet Pressure, psi		Each
NPT Female







				Brass Body—Bronze Diaphragm and PTFE Seal

				1/4	Side	600	1/4	Side	Screw	1 3/4"	Liquid Argon, Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen	-320 to 150	15 to 65 , 75 to 175 , 100 to 250	47435K31	0000000


				3/8	Side	600	3/8	Side	Screw	1 3/4"	Liquid Argon, Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen	-320 to 150	15 to 65 , 75 to 175 , 100 to 250	47435K32	000000