Wafer Check Valves | McMaster-Carr

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28 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
2	60	200 psi @ 70° F	1.25	-20° to 250°	2 1/8"	125	0000000	000000
2 1/2	100	200 psi @ 70° F	1.25	-20° to 250°	2 1/8"	125	0000000	00000
3	170	200 psi @ 70° F	1.25	-20° to 250°	2 1/4"	125	0000000	000000
4	340	200 psi @ 70° F	1.25	-20° to 250°	2 1/2"	125	0000000	000000
5	520	200 psi @ 70° F	1.25	-20° to 250°	2 3/4"	125	0000000	000000
6	850	200 psi @ 70° F	1.25	-20° to 250°	3"	125	0000000	000000
8	1,600	200 psi @ 70° F	1.25	-20° to 250°	3 3/4"	125	0000000	000000
10	2,400	200 psi @ 70° F	1.25	-20° to 250°	4 1/4"	125	0000000	000000

Compact Flange-Mount Check Valves

Shown with Flanges (Not Included)

For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
Piston Material: 316 Stainless Steel
Spring Material: 316 Stainless Steel
Seal Material: Viton® Fluoroelastomer

Less than half the end-to-end length of standard flange-mount check valves, these can be installed between ANSI flanges in pipelines with limited clearance. ANSI flanges are sold separately. Valves open to allow flow in one direction and close when flow stops or reverses. All have a 316 stainless steel body 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
1/2	2.4	720 psi @ 100° F	0.5	-10° to 400°	1/4"	150, 300	0000000	0000000
3/4	4.4	720 psi @ 100° F	0.5	-10° to 400°	1/4"	150, 300	0000000	000000
1	6.1	720 psi @ 100° F	0.5	-10° to 400°	1/4"	150, 300	0000000	000000
1 1/4	12.7	720 psi @ 100° F	0.5	-10° to 400°	1/4"	150, 300	0000000	000000
1 1/2	18.8	720 psi @ 100° F	0.5	-10° to 400°	1/4"	150, 300	0000000	000000
2	32	720 psi @ 100° F	0.5	-10° to 400°	1/4"	150, 300	0000000	000000
3	89	720 psi @ 100° F	0.5	-10° to 400°	5/16"	150, 300	0000000	000000
4	144	720 psi @ 100° F	0.5	-10° to 400°	3/8"	150, 300	0000000	000000

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
2	48	275 psi @ 70° F	1.25	-20° to 1000°	2 3/8"	150, 300, 600	0000000	0000000
2 1/2	90	275 psi @ 70° F	1.25	-20° to 1000°	2 5/8"	150, 300, 600	0000000	000000
3	171	275 psi @ 70° F	1.25	-20° to 1000°	2 7/8"	150, 300, 600	0000000	000000
4	291	275 psi @ 70° F	1.25	-20° to 1000°	2 7/8"	150, 300	0000000	000000
6	705	275 psi @ 70° F	1.25	-20° to 1000°	3 7/8"	150, 300	0000000	00000000
8	1,795	275 psi @ 70° F	1.25	-20° to 1000°	5"	150, 300	0000000	00000000

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
2	70	200 psi @ 300° F	2	0° to 200°	1 11/16"	125, 150	000000	000000
2 1/2	120	200 psi @ 300° F	2	0° to 200°	1 13/16"	125, 150	000000	00000
3	190	200 psi @ 300° F	2	0° to 200°	2 1/2"	125, 150	000000	000000
4	340	200 psi @ 300° F	2	0° to 200°	2 1/2"	125, 150	000000	000000
5	590	200 psi @ 300° F	2	0° to 200°	2 3/4"	125, 150	000000	000000
6	870	200 psi @ 300° F	2	0° to 200°	3"	125, 150	000000	000000