3 Check Valves | McMaster-Carr

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	Connection Style Connection Style


Threaded	Flanged

Socket Connect

	Body Material Body Material

	For Use With For Use With

	Mounting Orientation Mounting Orientation

Horizontal

Vertical

Any Position

	Check Valve Type Check Valve Type

	Maximum Pressure Maximum Pressure

	Connection Connection

Inlet

Outlet

	Seal Material Seal Material

	Valve Type Valve Type

Check

	Shape Shape

	Straight

	System of Measurement System of Measurement

Inch

	End-to-End Length End-to-End Length

	Specifications Met Specifications Met

	Valve Function Valve Function

Backflow Prevention

	Actuation Actuation

Pressure

Vacuum

	Flow Coefficient (Cv) Flow Coefficient (Cv)

	Connection Type Connection Type

	Pipe

	Type Type

Connector

Insert

	Maximum Temperature Maximum Temperature

	Thread Type Thread Type

NPT

	Pressure Class Pressure Class

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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22 Products

About Backflow-Prevention Valves

Female Inlet × Female Outlet

These valves open to allow flow in one direction and close when flow stops or reverses.

Nickel-plated brass valves are more corrosion resistant than plain brass or bronze valves.

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.

Connectors, NPT Female Inlet × NPT Female Outlet

For Use With: See table
Spring Material: See table
Seal Material: See table

Brass Body—Buna-N Rubber Spring-Loaded Piston
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Max. Steam Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Spring Material	Seal Material	End-to-End Lg.	For Use With		Each
3	185	400 psi @ 70° F	__	2	35° to 225°	302 Stainless Steel	Buna-N Rubber	7 7/16"	Air; Argon; Helium; Krypton; Neon; Oil; Water; Xenon	0000000	0000000
Brass Body—304 Stainless Steel Spring-Loaded Piston
3	191	400 psi @ 70° F	125 psi @ 350° F	2	35° to 350°	302 Stainless Steel	303 Stainless Steel	7 7/16"	Air; Argon; Helium; Krypton; Neon; Oil; Steam; Water; Xenon	0000000	000000
Nickel-Plated Brass Body—304 Stainless Steel Spring-Loaded Piston
3	191	400 psi @ 70° F	125 psi @ 350° F	2	35° to 225°	302 Stainless Steel	303 Stainless Steel	7 7/16"	Air; Argon; Helium; Krypton; Neon; Oil; Steam; Water; Xenon	0000000	000000

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.

316 stainless steel valves are more corrosion resistant than bronze valves.

Repair kits include everything you need to rebuild the valve.

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.

Bronze Body

Repair Kit for 125 Pressure Class

For Use With: Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon
Disc Material: See table
Seal Material: See table

Valves												Repair Kits
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Max. Steam Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Disc Material	Seal Material	End-to-End Lg.	Features		Each		Each
NPT Female × NPT Female—Pressure Class 125
3	297	200 psi @ 150° F	125 psi @ 353° F	0.5	-20° to 405°	Bronze	Bronze	6 7/8"	Removable Cap	0000000	0000000	0000000	0000000
NPT Female × NPT Female—Pressure Class 150
3	240	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Bronze	Bronze	7 7/8"	Removable Cap	0000000	00000000	000000	00

316 Stainless Steel Body

For Use With: Air, Steam, Water
Disc Material: 316 Stainless Steel
Seal Material: 316 Stainless Steel

NPT Female × NPT Female—Pressure Class Not Rated
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Max. Steam Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.	Features		Each
3	390	200 psi @ 70° F	150 psi @ 350° F	0.5	-20° to 400°	7 5/16"	Removable Cap	00000000	0000000

High-Temperature Threaded Check Valves

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

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.

Use bronze valves when corrosion is not a concern.

Repair kits include everything you need to rebuild the valve.

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.

Valves								Repair Kits
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.		Each		Each
Bronze Body
NPT Female × NPT Female
3	185	400 psi @ 70° F	1	0° to 500°	7 3/8"	00000000	0000000	00000000	000000

Flange-Mount Check 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
3	170	200 psi @ 70° F	1.25	-20° to 250°	2 1/4"	125	0000000	0000000

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
3	89	720 psi @ 100° F	0.5	-10° to 400°	5/16"	150, 300	0000000	0000000

Socket-Connect Check Valves

For Use With: Argon, Helium, Krypton, Neon, Steam, Water, Xenon
Disc Material: 316 Stainless Steel
Seal Material: 316 Stainless Steel

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.

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

316 Stainless Steel Body
Pipe Size	Flow Coefficient (Cv)	Pressure Class	Max. Pressure	Max. Steam Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.	Features		Each
Socket Connect × Socket Connect
3	390	200	200 psi @ 70° F	150 psi @ 350° F	0.5	-20° to 400°	7 5/16"	Removable Cap	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
3	40	60 psi @ 140° F	0	35° to 140°	White	7 5/16"	Horizontal	Removable Cap	0000000	000000	0000000	00000

Clear-View Socket-Connect Check Valves

For Use With: Air, Water
Piston Material: PVC Plastic
Seal Material: EPDM Rubber

Visually inspect flow and debris accumulation through the transparent valve body. Insert unthreaded pipe into the socket ends and bond with primer and cement to create a permanent, leak-tight connection. These valves open to allow flow in one direction and close when flow stops or reverses. They 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.

PVC Plastic Body
Pipe Size	For Pipe Schedule	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Color	End-to-End Lg.	Features		Each
Socket Connect × Socket Connect
3	40, 80	168	150 psi @ 70° F	0.29	35° to 140°	Clear	12 1/4"	Removable Cap	0000000	0000000

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
3	292	125	200 psi @ 70° F	125 psi @ 353° F	1 psi	-20° to 405°	9 1/2"	7 1/2"	4	5/8"	6"	No	Removable Cap	0000000	0000000

Threaded Check Valves for Harsh Chemicals

These valves open to allow flow in one direction and close when flow stops or reverses.

Valves for drinking water meet NSF/ANSI Standard 61.

Polypropylene valves are more corrosion resistant than PVC or CPVC valves.

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.

PVC Plastic Body—Ball

For Use With: Air, Butane, Carbon Dioxide, Citric Acid, Deionized Water, Diesel Fuel, Drinking Water, Ethanol, Ethylene Glycol, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Methanol, Mineral Spirits, Natural Gas, Oil, Oxygen, Phosphoric Acid, Potable Water, Propane, Salt Water, Soap Solutions, Sodium Hydroxide, Sodium Hypochlorite, Water
Ball Material: PVC Plastic
Seal Material: Fluoroelastomer Rubber

NPT Female × NPT Female
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Color	End-to-End Lg.	Specifications Met		Each
3	250	150 psi @ 70° F	1.5	35° to 140°	Dark Gray	10 9/16"	ASTM D1784, NSF/ANSI 61	0000000	0000000

CPVC Plastic Body—Ball

For Use With: Air, Butane, Carbon Dioxide, Citric Acid, Deionized Water, Diesel Fuel, Drinking Water, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Mineral Spirits, Natural Gas, Nitric Acid, Oxygen, Phosphoric Acid, Potable Water, Propane, Salt Water, Soap Solutions, Sodium Hydroxide, Sodium Hypochlorite, Sulfuric Acid, Water
Ball Material: CPVC Plastic
Seal Material: Fluoroelastomer Rubber

NPT Female × NPT Female
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Color	End-to-End Lg.	Specifications Met		Each
3	250	150 psi @ 70° F	1.5	35° to 190°	Dark Gray	10 9/16"	ASTM D1784, NSF/ANSI 61	0000000	0000000

Flanged Check Valves for Harsh Chemicals

For Use With: Ammonia, Chlorine, Citric Acid, Deionized Water, Diesel Fuel, Ethanol, Ethylene Glycol, Fuel Oil, Gasoline, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Methanol, Methyl Ethyl Ketone, Mineral Spirits, Oil, Phosphoric Acid, Salt Water, Soap Solutions, Toluene, Water, Xylene
Ball Material: PTFE Plastic
Seal Material: PTFE Plastic

Bolt these valves to ANSI flanges. The glass-filled vinyl body and PTFE seal stand up to a wide range of harsh chemicals. 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.

Glass-Filled Vinyl Plastic Body
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Color	End-to-End Lg.	For Flange Class	Flange OD	Number of Bolt Holes	Bolt Hole Size	Bolt Circle Dia.	Bolts Included		Each
Flanged × Flanged
3	163	140 psi @ 250 ° F	1	-40° to 250°	Beige	8"	150	7 1/2"	4	3/4"	6"	No	000000	000000000

Heavy Duty Threaded Check Valves for Drinking Water

For Use With: Drinking Water
Piston Material: Polyetherimide Plastic
Spring Material: 302 Stainless Steel
Seal Material: Buna-N Rubber

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.

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.

Brass Body
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.		Each
NPT Female × NPT Female
3	158	400 psi @ 180° F	0.5	10° to 210°	4 7/8"	0000000	0000000

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
3	190	200 psi @ 300° F	2	0° to 200°	2 1/2"	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
3	171	275 psi @ 70° F	1.25	-20° to 1000°	2 7/8"	150, 300, 600	0000000	0000000