3/8 Check Valves | McMaster-Carr

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92 Products

About Backflow-Prevention Valves

Female Inlet × Female Outlet

Male Inlet × Male Outlet

Female Inlet × Male Outlet

Male Inlet × Female Outlet

Flared Angle Adapter

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.

316 stainless steel valves have the best 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.

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
Brass Body—Brass Spring-Loaded Piston
3/8	2.2	500 psi @ 70° F	__	1	-20° to 180°	302 Stainless Steel	Buna-N Rubber	2 1/4"	Air; Argon; Helium; Krypton; Neon; 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
Nickel-Plated Brass Body—303 Stainless Steel Spring-Loaded Piston
3/8	2	400 psi @ 70° F	125 psi @ 350° F	2	35° to 225°	302 Stainless Steel	303 Stainless Steel	2 5/8"	Air; Argon; Helium; Krypton; Neon; Oil; Steam; Water; Xenon	0000000	00000
Bronze Body—PTFE Plastic Spring-Loaded Ball
3/8	1.21	400 psi @ 70° F	125 psi @ 350° F	0.5	-20° to 405°	Stainless Steel	PTFE Plastic	2 1/8"	Air; Argon; Helium; Krypton; Neon; Steam; Water; Xenon	00000000	00000
316 Stainless Steel Body—Fluoroelastomer Rubber Spring-Loaded Piston
3/8	3.9	3,000 psi @ 70° F	__	1	-5° to 350°	316 Stainless Steel	Fluoroelastomer Rubber	2 5/8"	Air; Argon; Helium; Krypton; Neon; Water; Xenon	0000000	00000

Connectors, NPT Male Inlet × NPT Male Outlet

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

Brass Body—Brass 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.		Each
3/8	1.4	500 psi @ 70° F	1	-20° to 180°	302 Stainless Steel	Buna-N Rubber	1 3/4"	0000000	000000
316 Stainless Steel Body—Fluoroelastomer Rubber Spring-Loaded Piston
3/8	3.9	3,000 psi @ 70° F	1	-5° to 350°	316 Stainless Steel	Fluoroelastomer Rubber	3 13/16"	0000000	00000

Adapters, NPT Female Inlet × NPT Male Outlet

For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
Spring Material: 302 Stainless Steel
Seal Material: See table

Brass Body—Brass Spring-Loaded Piston
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Seal Material	End-to-End Lg.		Each
3/8	1.6	500 psi @ 70° F	1	-20° to 180°	Buna-N Rubber	1 15/16"	0000000	000000

Adapters, NPT Male Inlet × NPT Female Outlet

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

Brass Body—Brass 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	1.6	500 psi @ 70° F	__	1	-20° to 180°	302 Stainless Steel	Buna-N Rubber	1 15/16"	Air; Argon; Helium; Krypton; Neon; Water; Xenon	0000000	000000
Bronze Body—PTFE Plastic Spring-Loaded Ball
3/8	1.21	400 psi @ 70° F	125 psi @ 350° F	0.5	-20° to 405°	Stainless Steel	PTFE Plastic	2 3/8"	Air; Argon; Helium; Krypton; Neon; Steam; Water; Xenon	00000000	00000

Adapters, NPT Male Inlet × 37° UN/UNF (JIC) Male Outlet

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

316 Stainless Steel Body—Fluoroelastomer Rubber Spring-Loaded Piston
Inlet Pipe Size	Outlet Thread Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.		Each
3/8	9/16"-18	3.1	3,000 psi @ 70° F	2	-5° to 350°	3 11/16"	0000000	000000

Connectors, NPTF Female Inlet × NPTF Female Outlet

For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
Spring Material: 304 Stainless Steel
Seal Material: Fluoroelastomer Rubber

Brass Body—Brass Spring-Loaded Piston
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.		Each
3/8	5.2	1,000 psi @ 70° F	0.3	10° to 400°	2 3/8"	0000000	000000

Connectors, NPTF Male Inlet × NPTF Male Outlet

For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
Spring Material: 304 Stainless Steel
Seal Material: Fluoroelastomer Rubber

Brass Body—Brass Spring-Loaded Piston
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.		Each
3/8	5.2	1,000 psi @ 70° F	0.3	10° to 400°	2 7/16"	0000000	000000

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	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	00000000	000000
316 Stainless Steel Body—Fluoroelastomer Rubber Spring-Loaded Piston
3/8	3.1	3,000 psi @ 70° F	__	2	-5° to 350°	316 Stainless Steel	Fluoroelastomer Rubber	2 5/8"	Air; Argon; Helium; Krypton; Neon; Water; Xenon	0000000	00000
316 Stainless Steel Body—316 Stainless Steel Spring-Loaded Piston
3/8	3.48	580 psi @ 350° F	150 psi @ 212° F	4	0° to 355°	302 Stainless Steel	Fluoroelastomer Rubber	2 5/8"	Air; Argon; Helium; Krypton; Neon; Steam; Water; Xenon	0000000	000000

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

Adapters, 37° UN/UNF (JIC) Male Inlet × NPT Male Outlet

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

316 Stainless Steel Body—Fluoroelastomer Rubber Spring-Loaded Piston
Inlet Thread Size	Outlet Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.		Each
9/16"-18	3/8	3.1	3,000 psi @ 70° F	2	-5° to 350°	3 11/16"	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.

Bronze Body

Repair Kit for 125 Pressure Class

Repair Kit for 200 and 300 Pressure Classes

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
3/8	6	200 psi @ 150° F	125 psi @ 353° F	0.5	-20° to 405°	Brass	Brass	2 1/8"	Removable Cap	0000000	000000	0000000	000000
NPT Female × NPT Female—Pressure Class 150
3/8	4.3	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Bronze	Bronze	2 1/4"	Removable Cap	0000000	00000	000000	00
NPT Female × NPT Female—Pressure Class 200
3/8	4.3	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	2 1/4"	Removable Cap	0000000	000000	00000000	00000
NPT Female × NPT Female—Pressure Class 300
3/8	4.3	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	2 1/4"	Removable Cap	0000000	000000	00000000	00000

316 Stainless Steel Body

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

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
3/8	11	200 psi @ 70° F	150 psi @ 350° F	0.5	-20° to 400°	2 9/16"	Removable Cap	00000000	000000

Plastic Threaded Check Valves

Female Inlet × Female Outlet

Plastic provides a lightweight alternative to metal. These valves open to allow flow in one direction and close when flow stops or reverses.

Glass-filled polypropylene valves are more corrosion resistant than PVC 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.

Glass-Filled Polypropylene Plastic Body

For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
Piston Material: Polypropylene Plastic
Spring Material: 302 Stainless Steel
Seal Material: Buna-N Rubber

NPT Female Inlet × NPT Female Outlet
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Color	End-to-End Lg.		Each
3/8	4.2	125 psi @ 70° F	0.33	35° to 140°	Black	2 1/16"	0000000	000000

Compact Plastic Threaded Check Valves

For Use With: Air, Water
Piston Material: Nylon Plastic
Spring Material: 316 Stainless Steel
Seal Material: Buna-N Rubber

At 1 1/2" long or less, these valves fit in confined spaces. They open to allow flow in one direction and close when flow stops or reverses.

Nylon Plastic Body
Pipe Size	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Color	End-to-End Lg.		Each
NPT Male × NPT Male
3/8 × 3/8	125 psi @ 70° F	1	-20° to 250°	White	1 1/4"	0000000	000000

High-Pressure Threaded Check Valves

These valves are rated for up to twice the pressure of standard check valves. They open to allow flow in one direction and close when flow stops or reverses.

316 stainless steel valves are more corrosion resistant than brass 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.

Brass Body

Female Inlet × Female Outlet

Female Inlet × Male Outlet

Male Inlet × Male Outlet

Male Inlet × Female Outlet

For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
Ball Material: 316 Stainless Steel
Spring Material: 302 Stainless Steel
Seal Material: Buna-N 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
3/8	1.4	3,000 psi @ 70° F	1	-20° to 180°	2 9/16"	0000000	000000
NPT Female Inlet × NPT Male Outlet
3/8	1.1	3,000 psi @ 70° F	1	-20° to 180°	2 11/16"	0000000	00000
NPT Male Inlet × NPT Male Outlet
3/8	1.1	3,000 psi @ 70° F	1	-20° to 180°	2 11/16"	0000000	00000
NPT Male Inlet × NPT Female Outlet
3/8	1.1	3,000 psi @ 70° F	1	-20° to 180°	2 9/16"	0000000	00000

316 Stainless Steel Body

Female Inlet × Female Outlet

For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
Piston Material: 316 Stainless Steel
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
3/8	1.47	3,000 psi @ 70° F	0.33	-5° to 350°	2 1/16"	0000000	0000000

High-Temperature Threaded Check Valves

1/8 to 1 1/4 Pipe Size Bronze

Repair Kit for 1/8 to 1 1/4 Pipe Size Bronze 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
3/8	Not Rated	300 psi @ 70° F	2	50° to 500°	2 1/4"	00000000	000000	00000000	000000

Check Valves with Barbed Fittings

Barbed Male Inlet × NPT Male Outlet (Spring-Loaded Piston)

NPT Male Inlet × Barbed Male Outlet (Spring-Loaded Piston)

Barbs grip onto tubing, providing a secure hold. These valves open to allow flow in one direction and close when flow stops or reverses.

Nylon valves are more impact resistant than PVC or polypropylene 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.

Nylon Plastic Body—Spring-Loaded Piston

For Use With: Air, Water
Piston Material: Nylon Plastic
Spring Material: 316 Stainless Steel
Seal Material: Buna-N Rubber

Barbed Male Inlet × NPT Male Outlet
For Inlet Tube ID	Pipe Size	For Outlet Tube ID	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Color	End-to-End Lg.		Each
3/8"	3/8	__	Not Rated	Not Rated	1	-20° to 250°	White	1 5/8"	00000000	000000
1/2"	3/8	__	Not Rated	Not Rated	1	-20° to 250°	White	1 9/16"	00000000	00000
5/8"	3/8	__	Not Rated	Not Rated	1	-20° to 250°	White	1 5/8"	00000000	00000
NPT Male Inlet × Barbed Male Outlet
__	3/8	3/8"	Not Rated	Not Rated	1	-20° to 250°	White	1 5/8"	0000000	00000

Heavy Duty Check Valves with Barbed Fittings

For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
Piston Material: Fluoroelastomer Rubber
Spring Material: 302 Stainless Steel
Seal Material: Fluoroelastomer Rubber

For more durability than plastic barbed check valves, these have a stainless steel body. Barbs grip onto tubing, providing a secure hold. Valves open to allow flow in one direction and close when flow stops or reverses. The stainless steel body provides 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.

Barbed Inlet × NPT Female Outlet

303 Stainless Steel Body
For Tube ID	Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.		Each
3/8"	3/8	1.1	300 psi @ 70° F	2	-10° to 300°	3 7/16"	0000000	000000

NPT Female Inlet × Barbed Outlet

	Outlet
Pipe Size	Barbed Connection Type	For Tube ID	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.		Each
303 Stainless Steel Body
3/8	Barbed	3/8"	1.1	300 psi @ 70° F	2	-10° to 300°	3 7/16"	0000000	000000

Check Valves with Yor-Lok Fittings

NPT Male Inlet × Yor Lok Female Outlet

Two sleeves give these fittings extra gripping power. They bite into tubing as you tighten the nut to form a strong seal. All are compatible with Swagelok®, Let-Lok, and Parker A-Lok fittings. Valves open to allow flow in one direction and close when flow stops or reverses.

316 stainless steel valves are more corrosion resistant than brass 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.

316 Stainless Steel Body

For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
Piston Material: 316 Stainless Steel
Spring Material: 302 Stainless Steel
Seal Material: Fluoroelastomer Rubber

NPT Male Inlet × Yor-Lok Female Outlet
Pipe Size	For Tube OD	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.		Each
3/8	3/8"	1.47	3,000 psi @ 70° F	0.33	-10° to 375°	2 1/16"	00000000	0000000

Check Valves with Push-to-Connect Fittings

Insert tubing into the push-to-connect fittings—no heat, solder, or flux required. These valves open to allow flow in one direction and close when flow stops or reverses.

Acetal valves are more wear resistant than PVC 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.

Acetal Plastic Body—NPT Male Inlet × Push-to-Connect Female Outlet Straight

NPT Male Inlet × Push-to-Connect Female Outlet Straight

For Use With: Air, Water
Piston Material: Nylon Plastic
Spring Material: See Table
Seal Material: Buna-N Rubber

Inlet Pipe Size	For Outlet Tube OD	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Spring Material	Color	End-to-End Lg.		Each
3/8	1/4"	1.1	125 psi @ 70° F	1	-30° to 250°	302 Stainless Steel	Gray	1 1/16"	00000000	000000
3/8	5/16"	1.1	125 psi @ 70° F	1	-30° to 250°	302 Stainless Steel	Gray	1 1/8"	00000000	00000
3/8	3/8"	Not Rated	125 psi @ 70° F	1	40° to 100°	316 Stainless Steel	Gray	1 7/16"	0000000	00000
3/8	1/2"	1.1	125 psi @ 70° F	1	-30° to 250°	302 Stainless Steel	Gray	1 7/16"	00000000	00000

Acetal Plastic Body—NPT Male Inlet × Push-to-Connect Female Outlet 90° Elbow

NPT Male Inlet ×
Push-to-Connect
Female Outlet 90° Elbow

For Use With: Air, Water
Piston Material: Nylon Plastic
Spring Material: See Table
Seal Material: Buna-N Rubber

Inlet Pipe Size	For Outlet Tube OD	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Spring Material	Color	Port-to-Port Lg.		Each
3/8	1/4"	1.1	125 psi @ 70° F	1	-30° to 250°	302 Stainless Steel	Gray	1 1/2"	00000000	000000
3/8	5/16"	1.1	125 psi @ 70° F	1	-30° to 250°	302 Stainless Steel	Gray	1 9/16"	00000000	00000
3/8	3/8"	1.1	125 psi @ 70° F	1	-30° to 250°	302 Stainless Steel	Gray	1 3/4"	00000000	00000
3/8	1/2"	1.1	125 psi @ 70° F	1	-30° to 250°	302 Stainless Steel	Gray	2 1/16"	00000000	00000

Acetal Plastic Body—Push-to-Connect Female Inlet × NPT Male Outlet Straight

Push-to-Connect Female Inlet × NPT Male Outlet Straight

For Use With: Air, Water
Piston Material: Nylon Plastic
Spring Material: 302 Stainless Steel
Seal Material: Buna-N Rubber

For Inlet Tube OD	Outlet Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Color	End-to-End Lg.		Each
1/4"	3/8	1.1	125 psi @ 70° F	1	-30° to 250°	Gray	1 1/16"	00000000	000000
5/16"	3/8	1.1	125 psi @ 70° F	1	-30° to 250°	Gray	1 1/8"	00000000	00000
3/8"	3/8	1.1	125 psi @ 70° F	1	-30° to 250°	Gray	1 7/16"	00000000	00000
1/2"	3/8	1.1	125 psi @ 70° F	1	-30° to 250°	Gray	1 7/16"	00000000	00000

Acetal Plastic Body—Push-to-Connect Female Inlet × NPT Male Outlet 90° Elbow

Push-to-Connect Female Inlet × NPT Male Outlet 90° Elbow

For Use With: Air, Water
Piston Material: Nylon Plastic
Spring Material: 302 Stainless Steel
Seal Material: Buna-N Rubber

For Inlet Tube OD	Outlet Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Color	Port-to-Port Lg.		Each
1/4"	3/8	1.1	125 psi @ 70° F	1	-30° to 250°	Gray	1 9/16"	00000000	000000
5/16"	3/8	1.1	125 psi @ 70° F	1	-30° to 250°	Gray	1 9/16"	00000000	00000
3/8"	3/8	1.1	125 psi @ 70° F	1	-30° to 250°	Gray	1 3/4"	00000000	00000
1/2"	3/8	1.1	125 psi @ 70° F	1	-30° to 250°	Gray	2 1/16"	00000000	00000

Socket-Connect Check Valves

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

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
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
3/8	5.5	200	200 psi @ 70° F	150 psi @ 350° F	0.5	-20° to 400°	2 9/16"	Removable Cap	0000000	000000

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.

PVDF Plastic Body—Spring-Loaded Ball

For Use With: Air, Ammonia, Butane, Carbon Dioxide, Chlorine, Citric Acid, Deionized Water, Diesel Fuel, Ethylene Glycol, Fuel Oil, Gasoline, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Natural Gas, Nitric Acid, Oil, Oxygen, Phosphoric Acid, Propane, Salt Water, Sodium Hydroxide, Toluene, Water, Xylene
Ball Material: 316 Stainless Steel
Spring Material: 316 Stainless Steel
Seal Material: Fluoroelastomer Rubber

NPT Male × NPT Male
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Color	End-to-End Lg.		Each
3/8	Not Rated	220 psi @ 70° F	2.5	40° to 180°	White	1 1/2"	00000000	000000

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, 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
3/8	3	150 psi @ 70° F	1.5	35° to 140°	Dark Gray	3"	ASTM D1784, NSF/ANSI 61	0000000	000000

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.

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
3/8	4.55	400 psi @ 180° F	0.5	10° to 210°	1 3/4"	0000000	000000

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.

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
3/8	2.2	500 psi @ 70° F	1	-20° to 180°	2 1/4"	0000000	000000
NPT Female Inlet × NPT Male Outlet
3/8	1.6	500 psi @ 70° F	1	-20° to 180°	1 15/16"	0000000	00000
NPT Male Inlet × NPT Male Outlet
3/8	1.4	500 psi @ 70° F	1	-20° to 180°	1 3/4"	0000000	00000
NPT Male Inlet × NPT Female Outlet
3/8	1.6	500 psi @ 70° F	1	-20° to 180°	1 15/16"	0000000	00000

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.

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
3/8	4.2	125 psi @ 70° F	0.33	35° to 140°	Black	2 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.

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
3/8	Not Rated	300 psi @ 70° F	2	50° to 500°	2 1/4"	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.

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
3/8	1.4	3,000 psi @ 70° F	1	-20° to 180°	2 9/16"	0000000	000000
NPT Female Inlet × NPT Male Outlet
3/8	1.1	3,000 psi @ 70° F	1	-20° to 180°	2 11/16"	0000000	00000
NPT Male Inlet × NPT Male Outlet
3/8	1.1	3,000 psi @ 70° F	1	-20° to 180°	2 11/16"	0000000	00000
NPT Male Inlet × NPT Female Outlet
3/8	1.1	3,000 psi @ 70° F	1	-20° to 180°	2 9/16"	0000000	00000

Threaded Check Valves for Vacuum

For Use With: Air
Ball Material: Acetal Plastic
Spring Material: Stainless Steel
Seal Material: Buna-N Rubber

Prevent vacuum loss with these airtight, leakproof valves. 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.

Anodized Aluminum Body
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.	Vacuum Rating, in. of Hg		Each
NPT Female × NPT Female
3/8	4.7	230 psi @ 200° F	0.3	0° to 200°	2 1/8"	0.6	000000	000000

Check Valves for Steam

Check Valve

Repair Kit

For Use With: Steam
Ball Material: PTFE Plastic
Spring Material: 316 Stainless Steel
Seal Material: PTFE Plastic

To withstand high pressures and temperatures in steam service applications, these valves have a 316 stainless steel body, PTFE ball, and PTFE seal. They open to allow flow in one direction and close when flow stops or reverses.

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. Steam Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.		Each		Each
316 Stainless Steel Body
NPT Female × NPT Female
3/8	1.21	125 psi @ 350° F	0.5	-5° to 350°	2 1/8"	00000000	000000	00000000	000000

Threaded Two-Stage Backflow-Prevention Valves

With Unthreaded Vent, Male Inlet × Female Outlet

For Use With: Air, Water
Disc Material: EPDM Rubber
Seal Material: EPDM Rubber

For maximum protection from system contamination, these valves have two integral check valves with a vent between them. If the primary check valve fails to close when flow stops or reverses, overflow is discharged through the vent and the secondary check valve prevents backflow.

Chrome-plated brass valve is more corrosion resistant than plain brass valves.

Valve with an unthreaded vent is commonly used on laboratory faucets and other applications with intermittent flow. It discharges overflow directly and should not be installed in areas where spillage could cause water damage.

Chrome-Plated Brass Body
Pipe Size	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.	Vent Type		Each
NPT Male Inlet × NPT Female Outlet
3/8	150 psi @ 140° F	25	35° to 140°	2 3/8"	Unthreaded	0000000	0000000

Vacuum-Breaking Valves

Also known as vacuum breakers, these valves have vents that open when pressure drops to relieve vacuum conditions and prevent backward suction from drawing liquid into upstream piping.

Chrome-plated bronze valves are more corrosion resistant than brass valves.

303 stainless steel valves have the best corrosion resistance.

Elbows are designed for intermittent flow. They discharge liquid directly and should not be installed in areas where spillage could cause damage.

Straights are often used with steam coils, heat exchangers, and space heaters.

Elbows

For Use With: Water
Seal Material: Silicone Rubber

				Chrome-Plated Bronze Body
Pipe Size	Max. Pressure	Temperature Range, °F	Port-to-Port Lg.		Each
NPT Female Inlet × NPT Female Outlet
3/8	125 psi @ 70° F	35° to 180°	1"	0000000	000000

Straights

For Use With: Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon
Seal Material: EPR Rubber

Brass Body
Inlet Pipe Size	Outlet Pipe Size	Max. Pressure	Temperature Range, °F	End-to-End Lg.	Body Material		Each
NPT Male Inlet × NPT Female Outlet
1/2	3/8	300 psi @ 70° F	-20° to 365°	1 3/4"	Brass	0000000	0000000
303 Stainless Steel Body
NPT Male Inlet × NPT Female Outlet
1/2	3/8	300 psi @ 70° F	-20° to 365°	1 3/4"	303 Stainless Steel	0000000	000000

Backflow-Prevention Inline Hydraulic Valves

Also known as check valves, these open to allow flow in one direction and close when flow stops or reverses.

Brass valves have good corrosion resistance. 303 stainless steel valves are more corrosion resistant than brass valves.

NPTF (Dryseal) threads are compatible with NPT threads.

NPTF Female Inlet × NPTF Female Outlet—Ball Check Valve

NPTF — NPTF (Female)

Inlet Connection		Outlet Connection
Pipe Size	Dash Size	Pipe Size	Dash Size	Max. Flow Rate, gpm	Flow Coefficient (Cv)	Max. Pressure, psi	Min. Opening Pressure, psi	Port-to-Port Lg.	Hex Wd.	Mounting Orientation	Temp. Range, °F		Each
Brass Body
3/8	06	3/8	06	5	0.83	2,000	2.5	2 1/4"	1 1/16"	Any Position	-15° to 400°	0000000	000000
3/8	06	3/8	06	10	3.3	2,000	2.5	2 1/2"	1"	Any Position	-30° to 200°	0000000	00000
Steel Body
3/8	06	3/8	06	5	0.83	5,000	2.5	2 1/4"	1 1/16"	Any Position	-15° to 400°	0000000	00000
3/8	06	3/8	06	10	3.3	5,000	2.5	2 1/2"	1"	Any Position	-30° to 200°	0000000	00000
303 Stainless Steel Body
3/8	06	3/8	06	5	0.83	5,000	2.5	2 1/4"	1 1/16"	Any Position	-15° to 400°	0000000	000000
3/8	06	3/8	06	10	3.3	5,000	2.5	2 1/2"	1"	Any Position	-30° to 200°	0000000	000000

NPTF Male Inlet × NPTF Male Outlet—Ball Check Valve

NPTF — NPTF (Male)

Inlet Connection		Outlet Connection
Pipe Size	Dash Size	Pipe Size	Dash Size	Max. Flow Rate, gpm	Flow Coefficient (Cv)	Max. Pressure, psi	Min. Opening Pressure, psi	Seal Material	Port-to-Port Lg.	Hex Wd.	Mounting Orientation	Temp. Range, °F		Each
Brass Body
3/8	06	3/8	06	6	1.31	2,000	2.5	__	1 5/8"	3/4"	Any Position	-30° to 190°	00000000	000000
3/8	06	3/8	06	6	1.31	2,000	2.5	Buna-N Rubber	1 5/8"	3/4"	Any Position	-30° to 190°	00000000	00000
Steel Body
3/8	06	3/8	06	6	1.31	3,000	2.5	__	1 5/8"	3/4"	Any Position	-30° to 190°	00000000	00000
3/8	06	3/8	06	6	1.31	3,000	2.5	Buna-N Rubber	1 5/8"	3/4"	Any Position	-30° to 190°	00000000	00000
303 Stainless Steel Body
3/8	06	3/8	06	6	1.31	3,000	2.5	Buna-N Rubber	1 5/8"	3/4"	Any Position	-30° to 190°	00000000	000000

BSPT Female Inlet × BSPT Female Outlet—Ball Check Valve

BSPT — BSPT and BSPP — BSPP

Inlet Connection		Outlet Connection
Pipe Size	Dash Size	Pipe Size	Dash Size	Max. Flow Rate, gpm	Flow Coefficient (Cv)	Max. Pressure, psi	Min. Opening Pressure, psi	Port-to-Port Lg.	Hex Wd.	Mounting Orientation	Temp. Range, °F		Each
Steel Body
3/8	06	3/8	06	10	3.3	5,000	2.5	2 1/2"	1"	Any Position	-30° to 200°	000000	000000

BSPP Female Inlet × BSPP Female Outlet—Ball Check Valve

BSPT — BSPT and BSPP — BSPP

Inlet Connection		Outlet Connection
Pipe Size	Dash Size	Pipe Size	Dash Size	Max. Flow Rate, gpm	Flow Coefficient (Cv)	Max. Pressure, psi	Min. Opening Pressure, psi	Port-to-Port Lg.	Hex Wd.	Mounting Orientation	Temp. Range, °F		Each
Steel Body
3/8	06	3/8	06	10	3.3	5,000	2.5	2 1/2"	1"	Any Position	-30° to 200°	000000	000000