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    13 Products
    About Pressure-Relief Valves
    industrial info icon

    Choose the correct valve type and pipe size to safely manage the pressure of your system.

    Pressure-Relief Valves for Cryogenic Applications

    Image of Product. Front orientation. Pressure-Relief Valves. 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
    		Bottom6003/4"-20
    		Top2 5/8"Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen-320 to 16522, 35, 50, 75, 100, 125, 150, 200, 250, 300, 350, 400, 45049315K7100000049315K9700000049315K94000000
    3/8
    		Bottom6003/4"-20
    		Top2 5/8"Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen-320 to 16522, 35, 50, 75, 100, 125, 150, 200, 250, 300, 350, 400, 45049315K720000049315K980000049315K9400000
    1/2
    		Bottom6003/4"-20
    		Top2 13/16"Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen-320 to 16522, 35, 50, 75, 100, 125, 150, 200, 250, 300, 350, 400, 45049315K730000049315K980000049315K9600000
     

    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
    Image of Product. Front orientation. Pressure-Relief Valves. Fast-Acting Pressure-Relief Valves for Cryogenic Liquids.
    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
    		Bottom400Side90° Elbow2 5/16"Liquid Argon, Liquid Nitrogen, Liquid Oxygen-320 to 350Pop Safety5, 10, 15, 20, 25, 30, 40, 50, 88, 100, 110, 125, 150, 200, 220, 250, 300, 325, 350, 4009137K11000000
     

    Long-Life Pressure-Regulating Valves for Cryogenic Liquids

    Image of Product. Front orientation. Pressure-Regulating Valves. 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
    		Side4001/4
    		SideScrew3 1/16"Liquid Argon, Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen-320 to 15010 to 30, 75 to 25049165K390000000
    1/2
    		Side4001/2
    		SideScrew4 1/2"Liquid Argon, Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen-320 to 15010 to 30, 20 to 75, 20 to 100, 50 to 25049165K59000000
    1
    		Side4001
    		SideScrew5 7/8"Liquid Argon, Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen-320 to 15010 to 35, 20 to 60, 20 to 100, 75 to 25049165K79000000
     

    Pressure-Regulating Valves for Cryogenic Liquids

    Image of Product. Front orientation. Pressure-Regulating Valves. 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
    		Side6001/4
    		SideScrew1 3/4"Liquid Argon, Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen-320 to 15015 to 65, 75 to 175, 100 to 25047435K310000000
    3/8
    		Side6003/8
    		SideScrew1 3/4"Liquid Argon, Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen-320 to 15015 to 65, 75 to 175, 100 to 25047435K32000000
     
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