Oil Check Valves | McMaster-Carr

	Pipe Size Pipe Size

1/8
1/4
3/8
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
4
6
8

	Thread Type Thread Type

NPT

BSPT

BSPP

	For Use With For Use With

	Body Material Body Material

	Connection Style Connection Style

	Threaded
	Flanged
	Butt Weld
	Socket Connect

	Mounting Orientation Mounting Orientation

Horizontal

Vertical

Any Position

	Gender Gender

Female

Male

	Minimum Opening Pressure Minimum Opening Pressure

	Maximum Pressure Maximum Pressure

	Seal Material Seal Material

Rubber

Stainless Steel

Graphite

	Check Valve Type Check Valve Type

	Flow Coefficient (Cv) Flow Coefficient (Cv)

0.2
0.4
0.6
0.7
0.9
1
1.1
1.2
1.4
1.6
2
2.1
2.2
2.4
2.69
3
3.1
4
4.2
4.4
5.08
5.4
5.7
6
6.1
8.1
12
12.7
13
14.8
18.8
22
22.34
32
35
48
90
171
291
705
1,795
Not Rated

	Maximum Temperature Maximum Temperature

	Minimum Temperature Minimum Temperature

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

	Spring Material Spring Material

	Type Type

Connector

Adapter

Insert

	Connection Connection

Inlet

Outlet

	Actuation Actuation

Pressure

Vacuum

	Piston Material Piston Material

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

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

RoHS Compliant with
Exemptions

RoHS Compliant

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

REACH Compliant

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84 Products

About Backflow-Prevention Valves

Threaded Check Valves for Oil and Fuel

These valves open to allow flow in one direction and close when flow stops or reverses. They function both horizontally and vertically. When vertical, the flow arrow must point up.

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

Female Inlet × Female Outlet

Female Inlet × Male Outlet

Male Inlet × Male Outlet

Male Inlet × Female Outlet

For Use With: Diesel Fuel, Gasoline, Oil
Piston Material: Brass
Spring Material: 302 Stainless Steel
Seal Material: Fluoroelastomer Rubber

NPT Female Inlet × NPT Female Outlet
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.		Each
1/8	0.6	500 psi @ 70° F	1	-20° to 180°	1 3/8"	0000000	000000
1/4	1.2	500 psi @ 70° F	1	-20° to 180°	1 13/16"	0000000	00000
3/8	2.2	500 psi @ 70° F	1	-20° to 180°	2 1/4"	0000000	00000
1/2	3.1	500 psi @ 70° F	1	-20° to 180°	2 9/16"	0000000	00000
3/4	5.4	500 psi @ 70° F	1	-20° to 180°	3"	0000000	00000
NPT Female Inlet × NPT Male Outlet
1/8	0.4	500 psi @ 70° F	1	-20° to 180°	1 1/16"	0000000	00000
1/4	0.7	500 psi @ 70° F	1	-20° to 180°	1 3/8"	0000000	00000
3/8	1.6	500 psi @ 70° F	1	-20° to 180°	1 15/16"	0000000	00000
1/2	2.4	500 psi @ 70° F	1	-20° to 180°	2 1/8"	0000000	00000
3/4	5.7	500 psi @ 70° F	1	-20° to 180°	3"	0000000	00000
NPT Male Inlet × NPT Male Outlet
1/8	0.2	500 psi @ 70° F	1	-20° to 180°	1 3/16"	0000000	00000
1/4	0.7	500 psi @ 70° F	1	-20° to 180°	1 1/2"	0000000	00000
3/8	1.4	500 psi @ 70° F	1	-20° to 180°	1 3/4"	0000000	00000
1/2	2.4	500 psi @ 70° F	1	-20° to 180°	2"	0000000	00000
NPT Male Inlet × NPT Female Outlet
1/8	0.4	500 psi @ 70° F	1	-20° to 180°	1 1/4"	0000000	00000
1/4	0.7	500 psi @ 70° F	1	-20° to 180°	1 5/8"	0000000	00000
3/8	1.6	500 psi @ 70° F	1	-20° to 180°	1 15/16"	0000000	00000
1/2	2.2	500 psi @ 70° F	1	-20° to 180°	1 7/8"	0000000	00000

304 Stainless Steel Body

Female Inlet × Female Outlet

For Use With: Diesel Fuel, Gasoline, Oil
Piston Material: 304 Stainless Steel
Spring Material: 304 Stainless Steel
Seal Material: Fluoroelastomer Rubber

BSPT Female Inlet × BSPT Female Outlet
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.		Each
1/2	Not Rated	200 psi @ 70° F	0.5	-40° to 300°	3 5/8"	0000000	0000000
3/4	Not Rated	200 psi @ 70° F	0.5	-40° to 300°	3 5/8"	0000000	000000
1	Not Rated	200 psi @ 70° F	0.5	-40° to 300°	4 1/16"	0000000	000000

High-Temperature Threaded Check Valves for Oil and Fuel

For Use With: Butane, Diesel Fuel, Fuel Oil, Natural Gas, Propane
Piston Material: Brass
Spring Material: 316 Stainless Steel
Seal Material: Fluoroelastomer Rubber

For more than twice the temperature rating of standard check valves for oil and fuel, these have a heat-resistant fluoroelastomer seal that can withstand temperatures up to 500° F. They 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.

Bronze Body
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.		Each
NPT Female × NPT Female
1/4	Not Rated	300 psi @ 70° F	2	50° to 500°	2 1/4"	0000000	000000
3/8	Not Rated	300 psi @ 70° F	2	50° to 500°	2 1/4"	0000000	00000
1/2	Not Rated	300 psi @ 70° F	2	50° to 500°	2 1/2"	0000000	000000
3/4	Not Rated	300 psi @ 70° F	2	50° to 500°	2 3/4"	0000000	000000
1	Not Rated	300 psi @ 70° F	2	50° to 500°	3 3/8"	0000000	000000
1 1/4	Not Rated	300 psi @ 70° F	2	50° to 500°	3 3/4"	0000000	000000

High-Pressure Threaded Check Valves for Oil and Fuel

Female Inlet × Female Outlet

Female Inlet × Male Outlet

Male Inlet × Male Outlet

Male Inlet × Female Outlet

For Use With: Diesel Fuel, Gasoline, Oil
Ball Material: 316 Stainless Steel
Spring Material: 302 Stainless Steel
Seal Material: Fluoroelastomer Rubber

Rated for at least four times the pressure of standard check valves for oil and fuel, these are often used in hydraulic applications. They 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 Inlet × NPT Female Outlet
1/4	1.1	3,000 psi @ 70° F	1	-20° to 180°	2 9/16"	0000000	000000
3/8	1.4	3,000 psi @ 70° F	1	-20° to 180°	2 9/16"	0000000	00000
1/2	2.1	2,000 psi @ 70° F	1	-20° to 180°	3 3/16"	0000000	000000
NPT Female Inlet × NPT Male Outlet
1/4	1.1	3,000 psi @ 70° F	1	-20° to 180°	2 11/16"	0000000	00000
3/8	1.1	3,000 psi @ 70° F	1	-20° to 180°	2 11/16"	0000000	00000
1/2	2.4	2,000 psi @ 70° F	1	-20° to 180°	3 3/16"	0000000	000000
NPT Male Inlet × NPT Male Outlet
1/4	1.1	3,000 psi @ 70° F	1	-20° to 180°	2 11/16"	0000000	00000
3/8	1.1	3,000 psi @ 70° F	1	-20° to 180°	2 11/16"	0000000	00000
1/2	2.4	2,000 psi @ 70° F	1	-20° to 180°	3 3/16"	0000000	000000
NPT Male Inlet × NPT Female Outlet
1/4	1.1	3,000 psi @ 70° F	1	-20° to 180°	2 9/16"	0000000	00000
3/8	1.1	3,000 psi @ 70° F	1	-20° to 180°	2 9/16"	0000000	00000
1/2	2.4	2,000 psi @ 70° F	1	-20° to 180°	3 3/16"	0000000	000000

Plastic Threaded Check Valves for Oil and Fuel

Plastic provides a lightweight alternative to metal. These 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.

Glass-Filled Polypropylene Plastic Body—Spring-Loaded Piston

Connector, Female Inlet × Female Outlet

For Use With: Diesel Fuel, Gasoline, Oil
Piston Material: Polypropylene Plastic
Spring Material: 302 Stainless Steel
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.		Each
1/4	3	125 psi @ 70° F	0.33	35° to 140°	Black	2"	0000000	000000
3/8	4.2	125 psi @ 70° F	0.33	35° to 140°	Black	2 1/16"	0000000	00000
1/2	8.1	125 psi @ 70° F	0.33	35° to 140°	Black	2 1/2"	0000000	00000
3/4	14.8	125 psi @ 70° F	0.33	35° to 140°	Black	2 3/4"	0000000	00000

Nylon Plastic Body—Spring-Loaded Ball

Connector, Female Inlet × Female Outlet

Adapter, Female Inlet × Male Outlet

Adapter, Male Inlet × Female Outlet

Connector, Male Outlet × Male Outlet

For Use With: Diesel Fuel, Gasoline, Oil
Ball Material: Stainless Steel
Spring Material: Stainless Steel
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.		Each
1/8	1.1	125 psi @ 70° F	0.33	35° to 140°	Black	2 1/4"	00000000	000000
1/4	1.2	125 psi @ 70° F	0.33	35° to 140°	Black	2 1/4"	00000000	00000
1/4	1.2	125 psi @ 70° F	0.33	35° to 140°	White	2 1/4"	00000000	00000
NPT Female × NPT Male
1/4	Not Rated	125 psi @ 70° F	0.33	35° to 140°	White	2 9/16"	00000000	00000
1/4	1	125 psi @ 70° F	0.33	35° to 140°	Black	2 9/16"	00000000	00000
NPT Male × NPT Female
1/8	1	125 psi @ 70° F	0.33	35° to 140°	Black	2 7/16"	00000000	00000
1/4	Not Rated	125 psi @ 70° F	0.33	35° to 140°	Black	2 9/16"	00000000	00000
NPT Male × NPT Male
1/8	0.9	125 psi @ 70° F	0.33	35° to 140°	Black	2 11/16"	00000000	00000
1/4	1	125 psi @ 70° F	0.33	35° to 140°	Black	2 7/8"	00000000	00000

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

Socket-Connect Check Valves for Oil and Fuel

Insert unthreaded pipe into the socket ends and weld to create a permanent, leak-tight connection. These heavy duty valves can withstand pressures up to 1,975 psi and temperatures up to 800° F. They 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.

Spring-loaded ball check valves resist sticking and clogging better than spring-loaded piston check 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.

Steel Body—Spring-Loaded Piston

For Use With: Diesel Fuel, Gasoline, Natural Gas, Oil
Piston Material: 420 Stainless Steel
Spring Material: 304 Stainless Steel
Seal Material: 304 Stainless Steel, Graphite

Socket Connect × Socket Connect
Pipe Size	Flow Coefficient (Cv)	Pressure Class	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.	Features		Each
3/4	2.69	800	1,975 psi @ 100° F	1.08	-20° to 800°	3 5/8"	Removable Cap	0000000	0000000
1	5.08	800	1,975 psi @ 100° F	1.08	-20° to 800°	4 3/8"	Removable Cap	0000000	000000
2	22.34	800	1,975 psi @ 100° F	1.08	-20° to 800°	6 13/16"	Removable Cap	0000000	000000

Steel Body—Spring-Loaded Ball

For Use With: Diesel Fuel, Natural Gas
Ball Material: 304 Stainless Steel
Spring Material: 304 Stainless Steel
Seal Material: 304 Stainless Steel, Graphite

Socket Connect × Socket Connect
Pipe Size	Flow Coefficient (Cv)	Pressure Class	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.	Features		Each
3/4	2.69	800	1,975 psi @ 100° F	1.08	-20° to 800°	3 5/8"	Removable Cap	0000000	0000000
1	5.08	800	1,975 psi @ 100° F	1.08	-20° to 800°	4 3/8"	Removable Cap	0000000	000000
2	22.34	800	1,975 psi @ 100° F	1.08	-20° to 800°	6 13/16"	Removable Cap	0000000	000000

Threaded Check 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
3/8	2	400 psi @ 70° F	__	2	35° to 225°	302 Stainless Steel	Buna-N Rubber	2 5/8"	Air; Argon; Helium; Krypton; Neon; Oil; Water; Xenon	0000000	000000
1/2	4	400 psi @ 70° F	__	2	35° to 225°	302 Stainless Steel	Buna-N Rubber	2 11/16"	Air; Argon; Helium; Krypton; Neon; Oil; Water; Xenon	0000000	00000
Brass Body—303 Stainless Steel Spring-Loaded Piston
3/8	2	400 psi @ 70° F	125 psi @ 350° F	2	35° to 350°	302 Stainless Steel	303 Stainless Steel	2 5/8"	Air; Argon; Helium; Krypton; Neon; Oil; Steam; Water; Xenon	0000000	00000
1/2	3	400 psi @ 70° F	125 psi @ 350° F	2	35° to 350°	302 Stainless Steel	303 Stainless Steel	2 11/16"	Air; Argon; Helium; Krypton; Neon; Oil; Steam; Water; Xenon	0000000	00000

Connectors, BSPP Female Inlet × BSPP 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	Min. Opening Pressure, psi	Temperature Range, °F	Spring Material	Seal Material	End-to-End Lg.	For Use With		Each
3/8	2	400 psi @ 70° F	2	35° to 225°	302 Stainless Steel	Buna-N Rubber	2 5/8"	Air; Argon; Helium; Krypton; Neon; Oil; Water; Xenon	00000000	000000
1/2	4	400 psi @ 70° F	2	35° to 225°	302 Stainless Steel	Buna-N Rubber	2 11/16"	Air; Argon; Helium; Krypton; Neon; Oil; Water; Xenon	00000000	00000
3/4	6	400 psi @ 70° F	2	35° to 225°	302 Stainless Steel	Buna-N Rubber	3 5/16"	Air; Argon; Helium; Krypton; Neon; Oil; Water; Xenon	00000000	00000
1	13	400 psi @ 70° F	2	35° to 225°	302 Stainless Steel	Buna-N Rubber	3 11/16"	Air; Argon; Helium; Krypton; Neon; Oil; Water; Xenon	00000000	00000

Connectors, BSPT Female Inlet × BSPT Female Outlet

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

Brass Body—303 Stainless Steel 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
3/8	2	400 psi @ 70° F	125 psi @ 350° F	2	35° to 350°	302 Stainless Steel	303 Stainless Steel	2 5/8"	Air; Argon; Helium; Krypton; Neon; Oil; Steam; Water; Xenon	00000000	000000
1/2	3	400 psi @ 70° F	125 psi @ 350° F	2	35° to 350°	302 Stainless Steel	303 Stainless Steel	2 11/16"	Air; Argon; Helium; Krypton; Neon; Oil; Steam; Water; Xenon	00000000	00000
3/4	6	400 psi @ 70° F	125 psi @ 350° F	2	35° to 350°	302 Stainless Steel	303 Stainless Steel	3 5/16"	Air; Argon; Helium; Krypton; Neon; Oil; Steam; Water; Xenon	00000000	00000
1	12	400 psi @ 70° F	125 psi @ 350° F	2	35° to 350°	302 Stainless Steel	303 Stainless Steel	3 11/16"	Air; Argon; Helium; Krypton; Neon; Oil; Steam; Water; Xenon	00000000	00000
1 1/4	22	400 psi @ 70° F	125 psi @ 350° F	2	35° to 350°	302 Stainless Steel	303 Stainless Steel	4 9/16"	Air; Argon; Helium; Krypton; Neon; Oil; Steam; Water; Xenon	00000000	00000
Brass Body—304 Stainless Steel Spring-Loaded Piston
1 1/2	35	400 psi @ 70° F	125 psi @ 350° F	2	35° to 350°	302 Stainless Steel	304 Stainless Steel	4 7/8"	Air; Argon; Helium; Krypton; Neon; Oil; Steam; Water; Xenon	00000000	000000

Butt-Weld Check Valves

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

Weld these valves to unthreaded pipe for a smooth, flush connection that provides maximum flow. All open to allow flow in one direction and close when flow stops or reverses. They 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	For Pipe Schedule	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.	Specifications Met		Each
Butt Weld × Butt Weld
1/2	40	2.4	1,500 psi @ 100° F	0.5	-10° to 400°	2 3/16"	ANSI/ASME B16.25	0000000	0000000
3/4	40	4.4	1,500 psi @ 100° F	0.5	-10° to 400°	2 11/16"	ANSI/ASME B16.25	0000000	000000
1	40	6.1	1,500 psi @ 100° F	0.5	-10° to 400°	2 15/16"	ANSI/ASME B16.25	0000000	000000
1 1/4	40	12.7	1,500 psi @ 100° F	0.5	-10° to 400°	3 5/8"	ANSI/ASME B16.25	0000000	000000
1 1/2	40	18.8	1,500 psi @ 100° F	0.5	-10° to 400°	3 15/16"	ANSI/ASME B16.25	0000000	000000
2	40	32	1,500 psi @ 100° F	0.5	-10° to 400°	4 3/8"	ANSI/ASME B16.25	0000000	000000