6 Check Valves | McMaster-Carr

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6 Products

About Backflow-Prevention Valves

Shown with Flanges (Not Included)

For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
Disc Material: Bronze
Seal Material: Buna-N Rubber

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.

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.

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

Cast Iron Body
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.	For Flange Class		Each
Flanged × Flanged
6	850	200 psi @ 70° F	1.25	-20° to 250°	3"	125	0000000	0000000

Plastic Socket-Connect Check Valves

Also known as backwater valves, these valves prevent backflow of sewage and wastewater in drain, waste, and vent systems. Insert unthreaded pipe into the socket ends and bond with primer and cement to create a permanent, leak-tight connection. 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.

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

PVC Plastic Body—Swing Valve

Swing Valve

Replacement Flapper

For Use With: Water
Pressure Class : Not Rated
Disc Material: PVC Plastic
Seal Material: PVC Plastic

Valves											Replacement Flappers
Pipe Size	For Pipe Schedule	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Color	End-to-End Lg.	Mounting Orientation	Features		Each		Each
Socket Connect × Socket Connect
6	40	60 psi @ 140° F	0	35° to 140°	White	15 3/16"	Horizontal	Removable Cap	0000000	0000000	0000000	000000

Flanged Check Valves

For Use With: Air, Steam, Water
Disc Material:
Pipe Size 4 and smaller: Bronze
Pipe Size 5 and larger: Iron
Seal Material: Bronze

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.

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.

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

Cast Iron Body
Pipe Size	Flow Coefficient (Cv)	Pressure Class	Max. Pressure	Max. Steam Pressure	Min. Opening Pressure	Temperature Range, °F	End-to-End Lg.	Flange OD	No. of Bolt Holes	Bolt Hole Size	Bolt Circle Dia.	Bolts Included	Includes		Each
Flanged × Flanged
6	1,060	125	200 psi @ 70° F	125 psi @ 353° F	1 psi	-20° to 405°	14"	11"	8	3/4"	9 1/2"	No	Removable Cap	0000000	000000000

Flange-Mount Check Valves for Drinking Water

Shown with Flanges (Not Included)

For Use With: Drinking Water
Disc Material: 316 Stainless Steel
Spring Material: 302 Stainless Steel
Seal Material: EPDM Rubber

Sandwich these valves between ANSI flanges in drinking water pipelines. ANSI flanges are sold separately. Valves meet NSF/ANSI Standard 61, which designates them as safe to use with drinking water. All open to allow flow in one direction and close when flow stops or reverses.

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.

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

Iron Body
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.	For Flange Class		Each
Flanged × Flanged
6	870	200 psi @ 300° F	2	0° to 200°	3"	125, 150	000000	0000000

Flange-Mount Check Valves for Oil and Fuel

Shown with Flanges (Not Included)

For Use With: Butane, Diesel Fuel, Fuel Oil, Gasoline, Kerosene, Natural Gas, Oil, Propane
Disc Material: 316 Stainless Steel
Seal Material: 316 Stainless Steel

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.

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.

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

316 Stainless Steel Body
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.	For Flange Class		Each
Flanged × Flanged
6	705	275 psi @ 70° F	1.25	-20° to 1000°	3 7/8"	150, 300	0000000	000000000