McMaster-Carr logo
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    17 Products

    High-Flow Threaded Check Valves

    To achieve the maximum possible flow, internal components are designed to reduce flow resistance. These valves open to allow flow in one direction and close when flow stops or reverses. A removable cap provides easy access to internal components for maintenance.
    Bronze Body
    Image of Product. Front orientation. Check Valves. High-Flow Threaded Check Valves, Bronze Body.
    Image of Product. Repair Kit for 125 Pressure Class. Front orientation. Contains Inset. Valve Repair Kits. High-Flow Threaded Check Valves, For Pressure Class 125.
    Image of Product. Repair Kit for 200 and 300 Pressure Classes. Front orientation. Valve Repair Kits. High-Flow Threaded Check Valves, For Pressure Class 200.

    Repair Kit for 125

    Pressure Class

    Repair Kit for 200

    and 300 Pressure

    Classes

    Flow Coefficient (Cv)—Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
    Repair Kits—Repair kits include everything you need to rebuild the valve.
    Check Valves
    Repair Kits
    Pipe
    Size
    Flow Coefficient
    (Cv)
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Min. Opening
    Pressure, psi
    Temp. Range,
    ° F
    End-to-End
    Lg.
    Mounting Position
    Features
    Specs.
    Met
    For Use With
    Disc
    Material
    Seal
    Material
    Each
    For Pressure
    Class
    For Pipe
    Size
    Each
    NPT Female Inlet × NPT Female Outlet—Pressure Class 125
    2 1/2 192200 psi @ 150° F125 psi @ 353° F0.5-20 to 4056"Horizontal, VerticalRemovable CapMSS SP-80Air, Argon, Helium, Krypton, Neon, Steam, Water, XenonBronzeBronze4708K590000000125
    		2 1/2
    		4708K270000000
     
    NPT Female Inlet × NPT Female Outlet—Pressure Class 150
    2 1/2 150300 psi @ 150° F150 psi @ 366° F0.5-20 to 4057"Horizontal, VerticalRemovable CapMSS SP-80Air, Argon, Helium, Krypton, Neon, Steam, Water, XenonBronzeBronze9773K59000000—————0
     
    NPT Female Inlet × NPT Female Outlet—Pressure Class 200
    2 1/2 150400 psi @ 150° F200 psi @ 388° F0.5-20 to 5507"Horizontal, VerticalRemovable CapMSS SP-80Air, Argon, Helium, Krypton, Neon, Steam, Water, XenonBronzeBronze9770K6900000000200, 300
    		2 1/2
    		9770K117000000
     
    NPT Female Inlet × NPT Female Outlet—Pressure Class 300
    2 1/2 150600 psi @ 150° F300 psi @ 422° F0.5-20 to 5507"Horizontal, VerticalRemovable CapMSS SP-80Air, Argon, Helium, Krypton, Neon, Steam, Water, XenonBronzeBronze9770K7900000000200, 300
    		2 1/2
    		9770K117000000
     
    316 Stainless Steel Body
    Image of Product. Front orientation. Check Valves. High-Flow Threaded Check Valves, 316 Stainless Steel Body.
    316 stainless steel valves are more corrosion resistant than bronze valves.
    Flow Coefficient (Cv)—Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
    Pipe
    Size
    Flow Coefficient
    (Cv)
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Min. Opening
    Pressure, psi
    Temp. Range,
    ° F
    End-to-End
    Lg.
    Mounting Position
    Features
    For Use With
    Disc Material
    Seal
    Material
    Each
    NPT Female Inlet × NPT Female Outlet—Pressure Class Not Rated
    2 1/2 660200 psi @ 70° F150 psi @ 350° F0.5-20 to 4006 1/8"Horizontal, VerticalRemovable CapAir, Steam, Water316 Stainless Steel
    		PTFE
    		46635K710000000
     

    Threaded Check Valves

    These valves open to allow flow in one direction and close when flow stops or reverses.
    Connectors, NPT Female Inlet × NPT Female Outlet
    Image of Product. Female Inlet × Female Outlet. Front orientation. Contains Annotated. Female. Threaded Check Valves, Female.
    Image of Specification. Flared Angle Connector. Front orientation. Contains Annotated. Connector Fitting. Threaded Check Valves.

    Female Inlet × Female

    Outlet

    Flared Angle Connector

    Nickel-Plated Brass Body—Nickel-plated brass valves are more corrosion resistant than plain brass or bronze valves.
    Flow Coefficient (Cv)—Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
    Pipe
    Size
    Flow Coefficient
    (Cv)
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Min. Opening
    Pressure, psi
    Temp. Range,
    ° F
    Spring Material
    Seal Material
    End-to-End
    Lg.
    For Use With
    Each
    Brass Body—Buna-N Spring-Loaded Piston
    2 1/2
    		69400 psi @ 70° F—235 to 225302 Stainless Steel
    		Buna-N
    		6 13/16"Air, Argon, Helium, Krypton, Neon, Oil, Water, Xenon7746K440000000
     
    Brass Body—304 Stainless Steel Spring-Loaded Piston
    2 1/2
    		77400 psi @ 70° F125 psi @ 350° F235 to 350302 Stainless Steel
    		303 Stainless Steel
    		6 13/16"Air, Argon, Helium, Krypton, Neon, Oil, Steam, Water, Xenon4753K61000000
     
    Nickel-Plated Brass Body—304 Stainless Steel Spring-Loaded Piston
    2 1/2
    		77400 psi @ 70° F125 psi @ 350° F235 to 350302 Stainless Steel
    		303 Stainless Steel
    		6 13/16"Air, Argon, Helium, Krypton, Neon, Oil, Steam, Water, Xenon4753K62000000
     

    Flange-Mount Check Valves

    Sandwich these valves between two ANSI flanges for backflow prevention at a fraction of the weight of flanged check valves and a reduced pipeline footprint. ANSI flanges are sold separately. All valves open to allow flow in one direction and close when flow stops or reverses.
    Cast Iron Body
    Image of System. Shown with Flanges (Not Included). Front orientation. Contains MultipleImages. Check Valves. Flange-Mount Check Valves.
    Image of Product. Front orientation. Check Valves. Flange-Mount Check Valves.

    Shown with Flanges (Not

    Included)

    Flow Coefficient (Cv)—Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
    Pipe
    Size
    Flow Coefficient
    (Cv)
    Max. Pressure
    @ Temp.
    Min. Opening
    Pressure, psi
    Temp. Range,
    ° F
    End-to-End
    Lg.
    Mounting Position
    For Flange
    Class
    For Use With
    Disc
    Material
    Seal
    Material
    Each
    Flanged × Flanged
    2 1/2 100200 psi @ 70° F1.25-20 to 2502 1/8"Horizontal, Vertical125
    		Air, Argon, Helium, Krypton, Neon, Water, XenonBronzeBuna-N
    		5023K32000000
     

    Flanged Check Valves

    Bolt these valves to ANSI flanges. They open to allow flow in one direction and close when flow stops or reverses. All have a removable cap that provides easy access to internal components for maintenance.
    Cast Iron Body
    Image of Product. Front orientation. Check Valves. Flanged Check Valves.
    Flow Coefficient (Cv)—Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
    Pipe
    Size
    Flow Coefficient
    (Cv)
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Min. Opening
    Pressure, psi
    Temp. Range,
    ° F
    End-to-End
    Lg.
    Mounting
    Position
    Flange
    OD
    No. of Bolt
    Holes
    Bolt Hole
    Size
    Bolt Circle
    Dia.
    Bolts
    Included
    Includes
    Specs. Met
    For Use With
    Disc
    Material
    Seal
    Material
    Each
    Flanged × Flanged—Pressure Class 125
    2 1/2 193200 psi @ 70° F125 psi @ 353° F1-20 to 4058 1/2"Horizontal7"43/4"5 1/2"NoRemovable CapASTM A126 Class B, MSS SP-71Air, Steam, WaterBronzeBronze8200T120000000
     

    Socket-Connect Check Valves

    Insert unthreaded pipe into the socket ends and weld to create a permanent, leak-tight connection. These valves open to allow flow in one direction and close when flow stops or reverses. The valve body is 316 stainless steel for excellent corrosion resistance. A removable cap provides easy access to internal components for maintenance.
    316 Stainless Steel Body
    Image of Product. Front orientation. Check Valves. Socket-Connect Check Valves.
    Flow Coefficient (Cv)—Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
    Pipe
    Size
    Flow Coefficient
    (Cv)
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Min. Opening
    Pressure, psi
    Temp. Range,
    ° F
    End-to-End
    Lg.
    Mounting Position
    Features
    Specs.
    Met
    For Use With
    Disc Material
    Seal
    Material
    Each
    Socket Connect × Socket Connect—Pressure Class 200
    2 1/2 280200 psi @ 70° F150 psi @ 350° F0.5-20 to 4006 1/8"Horizontal, VerticalRemovable CapASTM A351Argon, Helium, Krypton, Neon, Steam, Water, Xenon316 Stainless Steel
    		PTFE
    		7766K590000000
     

    Flange-Mount Check Valves for Oil and Fuel

    Install these valves between ANSI flanges. ANSI flanges are sold separately. All valves open to allow flow in one direction and close when flow stops or reverses. Body is 316 stainless steel for excellent corrosion resistance.
    316 Stainless Steel Body
    Image of System. Shown with Flanges (Not Included). Front orientation. Contains MultipleImages. Check Valves. Flange-Mount Check Valves for Oil and Fuel.
    Image of Product. Front orientation. Check Valves. Flange-Mount Check Valves for Oil and Fuel.

    Shown with Flanges (Not

    Included)

    Flow Coefficient (Cv)—Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
    Pipe
    Size
    Flow Coefficient
    (Cv)
    Max. Pressure
    @ Temp.
    Min. Opening
    Pressure, psi
    Temp. Range,
    ° F
    End-to-End
    Lg.
    Mounting Position
    For Flange
    Class
    Specs. Met
    For Use With
    Disc Material
    Seal Material
    Each
    Flanged × Flanged
    2 1/2 901,440 psi @ 70° F1.25-20 to 1,0002 5/8"Horizontal, Vertical150, 300, 600
    		API Std 594, API Std 598Butane, Diesel Fuel, Fuel Oil, Gasoline, Kerosene, Natural Gas, Oil, Propane316 Stainless Steel
    		316 Stainless Steel
    		7767K320000000
     

    High-Temperature Threaded Check Valves

    The heat-resistant rubber seal withstands temperatures up to 500° F. These valves open to allow flow in one direction and close when flow stops or reverses.
    Bronze Body—Poppet
    Image of Product. 1 1/2 to 3 Pipe Size Bronze. Front orientation. Check Valves. High-Temperature Threaded Check Valves, Bronze Body—Poppet.
    Image of Product. Repair Kit for 1 1/2 to 3 Pipe Size Bronze Valves and 303 Stainless Steel Valves. Front orientation. Valve Repair Kits. High-Temperature Threaded Check Valves, Poppet Check Valve.

    1 1/2 to 3 Pipe Size Bronze

    Repair Kit for 1

    1/2 to 3 Pipe Size

    Bronze Valves

    and 303 Stainless

    Steel Valves

    Use bronze valves when corrosion is not a concern.
    Flow Coefficient (Cv)—Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
    Repair Kits—Repair kits include everything you need to rebuild the valve.
    Check Valves
    Repair Kits
    Pipe
    Size
    Flow Coefficient
    (Cv)
    Max. Pressure
    @ Temp.
    Min. Opening
    Pressure, psi
    Temp. Range,
    ° F
    End-to-End
    Lg.
    Mounting Position
    For Use With
    Spring Material
    Seal Material
    Each
    For Pipe
    Size
    Each
    NPT Female Inlet × NPT Female Outlet
    2 1/2 69400 psi @ 70° F10 to 5006 3/4"Horizontal, VerticalAir, Argon, Helium, Krypton, Neon, Oil, Water, Xenon302 Stainless Steel
    		Fluoroelastomer
    		7295N11300000002 1/2
    		7295N127000000
     

    Heavy Duty Threaded Check Valves for Drinking Water

    For more durability than plastic, these valves have a metal body. They meet NSF/ANSI 61 for drinking water service. All open to allow flow in one direction and close when flow stops or reverses.
    Brass Body—Spring-Loaded Piston
    Image of Product. Front orientation. Check Valves. Heavy Duty Threaded Check Valves for Drinking Water.
    Flow Coefficient (Cv)—Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
    Pipe
    Size
    Flow Coefficient
    (Cv)
    Max. Pressure
    @ Temp.
    Min. Opening
    Pressure, psi
    Temp. Range,
    ° F
    End-to-End
    Lg.
    Mounting Position
    Food Industry
    Std.
    For Use With
    Piston
    Material
    Spring Material
    Seal
    Material
    Each
    NPT Female Inlet × NPT Female Outlet
    2 1/2 98.4175 psi @ 180° F0.510 to 2104 3/8"Any Angle, Horizontal, VerticalNSF/ANSI 61
    		Drinking WaterPEI302 Stainless Steel
    		Buna-N
    		8517T330000000
     
    back to top