3/8 Check Valves | McMaster-Carr

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94 Products

Threaded Check Valves

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

Connectors, NPT Female Inlet × NPT Female Outlet


Female Inlet × Female Outlet	Flared Angle Connector

Nickel-Plated Brass Body—Nickel-plated brass valves are more corrosion resistant than plain brass or bronze valves.

316 Stainless Steel Body—316 stainless steel valves have the best corrosion resistance.

Flow Coefficient (Cv)—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.

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Spring Material	Seal Material	End-to-End Lg.	For Use With		Each
Brass Body—Buna-N Spring-Loaded Piston



	3/8	2	400 psi @ 70° F	—	2	35 to 225	302 Stainless Steel	Buna-N	2 5/8"	Air, Argon, Helium, Krypton, Neon, Oil, Water, Xenon	7746K37	000000


	Brass Body—Brass Spring-Loaded Piston



			3/8	2.2	500 psi @ 70° F	—	1	-20 to 180	302 Stainless Steel	Buna-N	2 1/4"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	7768K13	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	4753K41	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 350	302 Stainless Steel	303 Stainless Steel	2 5/8"	Air, Argon, Helium, Krypton, Neon, Oil, Steam, Water, Xenon	4753K51	00000


							Bronze Body—PTFE Spring-Loaded Ball



									3/8	1.21	400 psi @ 70° F	125 psi @ 350° F	0.5	-20 to 405	Stainless Steel	PTFE	2 1/8"	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	47715K22	00000


									316 Stainless Steel Body—Fluoroelastomer Spring-Loaded Piston



											3/8	3.9	3,000 psi @ 70° F	—	1	-5 to 350	316 Stainless Steel	Fluoroelastomer	2 5/8"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	1874N13	00000

Connectors, NPT Male Inlet × NPT Male Outlet


Male Inlet × Male Outlet	Flared Angle Connector

316 Stainless Steel Body—316 stainless steel valves have the best corrosion resistance.

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Spring Material	Seal Material	End-to-End Lg.	For Use With		Each
Brass Body—Brass Spring-Loaded Piston



	3/8	1.4	500 psi @ 70° F	1	-20 to 180	302 Stainless Steel	Buna-N	1 3/4"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	7768K17	000000


	316 Stainless Steel Body—Fluoroelastomer Spring-Loaded Piston



			3/8	3.9	3,000 psi @ 70° F	1	-5 to 350	316 Stainless Steel	Fluoroelastomer	3 13/16"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	1874N14	00000

Adapters, NPT Female Inlet × NPT Male Outlet


Female Inlet × Male Outlet	Flared Angle Adapter

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Spring Material	Seal Material	End-to-End Lg.	For Use With		Each
Brass Body—Brass Spring-Loaded Piston



	3/8	1.6	500 psi @ 70° F	1	-20 to 180	302 Stainless Steel	Buna-N	1 15/16"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	7768K23	000000

Adapters, NPT Male Inlet × NPT Female Outlet


Male Inlet × Female Outlet	Flared Angle Adapter

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Spring Material	Seal Material	End-to-End Lg.	For Use With		Each
Brass Body—Brass Spring-Loaded Piston



	3/8	1.6	500 psi @ 70° F	—	1	-20 to 180	302 Stainless Steel	Buna-N	1 15/16"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	7768K29	000000


	Bronze Body—PTFE Spring-Loaded Ball



			3/8	1.21	400 psi @ 70° F	125 psi @ 350° F	0.5	-20 to 405	Stainless Steel	PTFE	2 3/8"	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	47715K42	00000

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


Male Inlet × Male Outlet	Flared Angle Adapter

316 Stainless Steel Body—316 stainless steel valves have the best corrosion resistance.

	Outlet Thread Size	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	For Use With	Spring Material	Seal Material		Each
316 Stainless Steel Body—Fluoroelastomer Spring-Loaded Piston



	3/8	9/16"-18	3.1	3,000 psi @ 70° F	2	-5 to 350	3 11/16"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	Fluoroelastomer	1874N55	000000

Connectors, NPTF Female Inlet × NPTF Female Outlet


Female Inlet × Female Outlet	Flared Angle Connector

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Spring Material	Seal Material	End-to-End Lg.	For Use With		Each
Brass Body—Brass Spring-Loaded Piston



	3/8	5.2	1,000 psi @ 70° F	0.3	10 to 400	304 Stainless Steel	Fluoroelastomer	2 3/8"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	7775K53	000000

Connectors, NPTF Male Inlet × NPTF Male Outlet


Male Inlet × Male Outlet	Flared Angle Connector

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Spring Material	Seal Material	End-to-End Lg.	For Use With		Each
Brass Body—Brass Spring-Loaded Piston



	3/8	5.2	1,000 psi @ 70° F	0.3	10 to 400	304 Stainless Steel	Fluoroelastomer	2 7/16"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	7775K63	000000

Connectors, BSPP Female Inlet × BSPP Female Outlet


Female Inlet × Female Outlet	Flared Angle Connector

316 Stainless Steel Body—316 stainless steel valves have the best corrosion resistance.

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Spring Material	Seal Material	End-to-End Lg.	For Use With		Each
Brass Body—Buna-N Spring-Loaded Piston



	3/8	2	400 psi @ 70° F	—	2	35 to 225	302 Stainless Steel	Buna-N	2 5/8"	Air, Argon, Helium, Krypton, Neon, Oil, Water, Xenon	7746K221	000000


	316 Stainless Steel Body—Fluoroelastomer Spring-Loaded Piston



			3/8	3.1	3,000 psi @ 70° F	—	2	-5 to 350	316 Stainless Steel	Fluoroelastomer	2 5/8"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	1874N34	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	2 5/8"	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	1958N13	000000

Connectors, BSPT Female Inlet × BSPT Female Outlet


Female Inlet × Female Outlet	Flared Angle Connector

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Spring Material	Seal Material	End-to-End Lg.	For Use With		Each
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	4753K101	000000

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


Male Inlet × Male Outlet	Flared Angle Adapter

316 Stainless Steel Body—316 stainless steel valves have the best corrosion resistance.

	Outlet Pipe Size	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	For Use With	Spring Material	Seal Material		Each
316 Stainless Steel Body—Fluoroelastomer Spring-Loaded Piston



	9/16"-18	3/8	3.1	3,000 psi @ 70° F	2	-5 to 350	3 11/16"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	Fluoroelastomer	1874N49	000000

Inline Hydraulic Check Valves

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

NPTF Female Inlet × NPTF Female Outlet—Ball Check Valve

Image of Product. Front orientation. Hydraulic Check Valves. Inline Hydraulic Check Valves, NPTF Female Inlet × NPTF Female Outlet—Ball Check Valve.

NPTF (Dryseal) threads are compatible with NPT threads.

Brass Body—Brass valves have good corrosion resistance.

303 Stainless Steel Body—303 stainless steel valves are more corrosion resistant than brass valves.

	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 Position	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 Angle	-15 to 400	5010K73	000000


		3/8	06	3/8	06	10	3.3	2,000	2.5	2 1/2"	1"	Any Angle	-30 to 200	4620K22	00000


		Steel Body



				3/8	06	3/8	06	5	0.83	5,000	2.5	2 1/4"	1 1/16"	Any Angle	-15 to 400	5010K53	00000


				3/8	06	3/8	06	10	3.3	5,000	2.5	2 1/2"	1"	Any Angle	-30 to 200	4620K42	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 Angle	-15 to 400	5010K63	000000


						3/8	06	3/8	06	10	3.3	5,000	2.5	2 1/2"	1"	Any Angle	-30 to 200	4620K82	000000

NPTF Male Inlet × NPTF Male Outlet—Ball Check Valve

NPTF (Dryseal) threads are compatible with NPT threads.

Brass Body—Brass valves have good corrosion resistance.

303 Stainless Steel Body—303 stainless steel valves are more corrosion resistant than brass valves.

	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 Position	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 Angle	-30 to 190	46105K63	000000


		3/8	06	3/8	06	6	1.31	2,000	2.5	Buna-N	1 5/8"	3/4"	Any Angle	-30 to 190	46105K71	00000


		Steel Body



				3/8	06	3/8	06	6	1.31	3,000	2.5	—	1 5/8"	3/4"	Any Angle	-30 to 190	46105K66	00000


				3/8	06	3/8	06	6	1.31	3,000	2.5	Buna-N	1 5/8"	3/4"	Any Angle	-30 to 190	46105K75	00000


				303 Stainless Steel Body



						3/8	06	3/8	06	6	1.31	3,000	2.5	Buna-N	1 5/8"	3/4"	Any Angle	-30 to 190	46105K78	00000

BSPT Female Inlet × BSPT Female Outlet—Ball Check Valve

	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 Position	Temp. Range, ° F		Each
Steel Body



		3/8	06	3/8	06	10	3.3	5,000	2.5	2 1/2"	1"	Any Angle	-30 to 200	1744N2	000000

BSPP Female Inlet × BSPP Female Outlet—Ball Check Valve

	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 Position	Temp. Range, ° F		Each
Steel Body



		3/8	06	3/8	06	10	3.3	5,000	2.5	2 1/2"	1"	Any Angle	-30 to 200	1744N6	000000

Threaded Check Valves for Harsh Chemicals

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

PVDF Body—Spring-Loaded Ball

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Color	End-to-End Lg.	Mounting Position	For Use With	Ball Material	Spring Material	Seal Material		Each
NPT Male Inlet × NPT Male Outlet



	3/8	Not Rated	220 psi @ 70° F	2.5	40 to 180	White	1 1/2"	Any Angle, Horizontal, Vertical	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 (Caustic Soda), Toluene (Methylbenzene), Water, Xylene	316 Stainless Steel	316 Stainless Steel	Fluoroelastomer	46505K33	000000

PVC Body—Ball

For Drinking Water—Valves for drinking water meet NSF/ANSI 61.

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Color	End-to-End Lg.	Mounting Position	Specs. Met	Food Industry Std.	For Use With	Ball Material	Seal Material		Each
NPT Female Inlet × NPT Female Outlet



	3/8	3	150 psi @ 70° F	1.5	35 to 140	Dark Gray	3"	Horizontal, Vertical	ASTM D1784	NSF/ANSI 61	Air, Butane, Carbon Dioxide, Citric Acid, Deionized Water, Diesel Fuel, Drinking Water, Ethanol, Ethylene Glycol, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Methanol (Methyl Alcohol), Mineral Spirits, Natural Gas, Oil, Oxygen, Phosphoric Acid, Propane, Salt Water, Soap Solutions, Sodium Hydroxide (Caustic Soda), Sodium Hypochlorite (Bleach), Water	PVC	Fluoroelastomer	4721K12	000000

Threaded Two-Stage Backflow-Prevention Valves

With Unthreaded Vent,

Male Inlet × Female

Outlet

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

Unthreaded—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.

	Temp. Range, ° F	End-to-End Lg.	Vent Connection	Specs. Met	Certification	For Use With	Disc Material	Seal Material		Each
Chrome-Plated Brass Body—Dual Check







	NPT Male Inlet × NPT Female Outlet

	3/8	150 psi @ 140° F	25	35 to 140	2 3/8"	Unthreaded	ASSE 1035	CSA Certified	Air, Water	EPDM	EPDM	4760K63	0000000

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.

Bronze Body


	Repair Kit for 125 Pressure Class	Repair Kit for 200 and 300 Pressure Classes

Repair Kits—Repair kits include everything you need to rebuild the valve.

	Check Valves															Repair Kits
	Pipe Size	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	Features	Specs. Met	For Use With	Disc Material	Seal Material		Each	For Pressure Class	For Pipe Size		Each
NPT Female Inlet × NPT Female Outlet—Pressure Class 125



		3/8	6	200 psi @ 150° F	125 psi @ 353° F	0.5	-20 to 405	2 1/8"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Brass	Brass	4708K52	000000	125	3/8	4708K31	000000


		NPT Female Inlet × NPT Female Outlet—Pressure Class 150



				3/8	4.3	300 psi @ 150° F	150 psi @ 366° F	0.5	-20 to 405	2 1/4"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9773K52	00000	—	—	———	0


				NPT Female Inlet × NPT Female Outlet—Pressure Class 200



						3/8	4.3	400 psi @ 150° F	200 psi @ 388° F	0.5	-20 to 550	2 1/4"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K62	000000	200, 300	3/8	9770K121	00000


						NPT Female Inlet × NPT Female Outlet—Pressure Class 300



								3/8	4.3	600 psi @ 150° F	300 psi @ 422° F	0.5	-20 to 550	2 1/4"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K72	000000	200, 300	3/8	9770K121	00000

316 Stainless Steel Body

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

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	Features	For Use With	Disc Material	Seal Material		Each
NPT Female Inlet × NPT Female Outlet—Pressure Class Not Rated



	3/8	11	200 psi @ 70° F	150 psi @ 350° F	0.5	-20 to 400	2 9/16"	Horizontal, Vertical	Removable Cap	Air, Steam, Water	316 Stainless Steel	PTFE	46635K63	000000

Compact Plastic Threaded Check Valves

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.

	Temp. Range, ° F	Color	End-to-End Lg.	For Use With	Piston Material	Spring Material	Seal Material		Each
Nylon Body







	NPT Male × NPT Male

	3/8 × 3/8	125 psi @ 70° F	1	-20 to 250	White	1 1/4"	Air, Water	Nylon	316 Stainless Steel	Buna-N	1424T19	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.

Brass Body—Spring-Loaded Ball


Female Inlet × Female Outlet	Female Inlet × Male Outlet	Male Inlet × Female Outlet	Male Inlet × Male Outlet

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	For Use With	Ball Material	Spring Material	Seal Material		Each
NPT Female Inlet × NPT Female Outlet



	3/8	1.4	3,000 psi @ 70° F	1	-20 to 180	2 9/16"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Buna-N	8549T12	000000


	NPT Female Inlet × NPT Male Outlet



			3/8	1.1	3,000 psi @ 70° F	1	-20 to 180	2 11/16"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Buna-N	8549T14	00000


			NPT Male Inlet × NPT Female Outlet



					3/8	1.1	3,000 psi @ 70° F	1	-20 to 180	2 9/16"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Buna-N	8549T16	00000


					NPT Male Inlet × NPT Male Outlet



							3/8	1.1	3,000 psi @ 70° F	1	-20 to 180	2 11/16"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Buna-N	8549T18	00000

316 Stainless Steel Body—Spring-Loaded Piston

Female Inlet × Female

Outlet

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

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	For Use With	Piston Material	Spring Material	Seal Material		Each
NPT Female Inlet × NPT Female Outlet



	3/8	1.47	3,000 psi @ 70° F	0.33	-5 to 350	2 1/16"	Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	7838K55	0000000

Check Valves with Yor-Lok Fittings

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 Body—Spring-Loaded Piston

NPT Male Inlet × Yor

Lok Female Outlet

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

	For Tube OD	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	For Use With	Piston Material	Spring Material	Seal Material		Each
NPT Male Inlet × Yor-Lok Female Outlet



	3/8	3/8"	1.47	3,000 psi @ 70° F	0.33	-10 to 375	2 1/16"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	45385K46	0000000

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.

Brass Body—Spring-Loaded Piston


Female Inlet × Female Outlet	Female Inlet × Male Outlet	Male Inlet × Female Outlet	Male Inlet × Male Outlet

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	For Use With	Piston Material	Spring Material	Seal Material		Each
NPT Female Inlet × NPT Female Outlet



	3/8	2.2	500 psi @ 70° F	1	-20 to 180	2 1/4"	Any Angle, Horizontal, Vertical	Diesel Fuel, Gasoline, Oil	Brass	302 Stainless Steel	Fluoroelastomer	7768K53	000000


	NPT Female Inlet × NPT Male Outlet



			3/8	1.6	500 psi @ 70° F	1	-20 to 180	1 15/16"	Any Angle, Horizontal, Vertical	Diesel Fuel, Gasoline, Oil	Brass	302 Stainless Steel	Fluoroelastomer	7768K63	00000


			NPT Male Inlet × NPT Female Outlet



					3/8	1.6	500 psi @ 70° F	1	-20 to 180	1 15/16"	Any Angle, Horizontal, Vertical	Diesel Fuel, Gasoline, Oil	Brass	302 Stainless Steel	Fluoroelastomer	7768K69	00000


					NPT Male Inlet × NPT Male Outlet



							3/8	1.4	500 psi @ 70° F	1	-20 to 180	1 3/4"	Any Angle, Horizontal, Vertical	Diesel Fuel, Gasoline, Oil	Brass	302 Stainless Steel	Fluoroelastomer	7768K57	00000

Air Flow Check Valves

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

NPT Female Inlet × NPT Female Outlet

Flow Coefficient (Cv)—Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve.

									Overall
	Inlet Pipe Size	Outlet Pipe Size	Flow Coefficient (Cv)	Min. Flow Rate, scfm	Max. Flow Rate, scfm	Max. Pressure, psi	Min. Opening Pressure, psi	Temp. Range, ° F	Lg.	Dia.		Each
316 Stainless Steel Body



		3/8	3/8	Not Rated	0	0.67	580	7	0 to 355	2 11/16"	1 1/8"	1096T14	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 Body—NPT Male Inlet × Push-to-Connect Female Outlet Straight

NPT Male Inlet ×

Push-to-Connect Female

Outlet Straight

Acetal valves are more wear resistant than PVC valves.

Inlet Pipe Size	For Outlet Tube OD	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Color	End-to-End Lg.	For Use With	Piston Material	Spring Material	Seal Material		Each
3/8	1/4"	1.1	50 psi @ 70° F	1	-30 to 250	Gray	1 1/16"	Air, Water	Nylon	302 Stainless Steel	Buna-N	1866T126	000000
3/8	5/16"	1.1	50 psi @ 70° F	1	-30 to 250	Gray	1 1/8"	Air, Water	Nylon	302 Stainless Steel	Buna-N	1866T127	00000
3/8	3/8"	Not Rated	50 psi @ 70° F	1	40 to 100	Gray	1 7/16"	Air, Water	Nylon	316 Stainless Steel	Buna-N	1866T35	00000
3/8	1/2"	1.1	50 psi @ 70° F	1	-30 to 250	Gray	1 7/16"	Air, Water	Nylon	302 Stainless Steel	Buna-N	1866T128	00000

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

NPT Male Inlet

Push-to-Connect

Female Outlet

90° Elbow

Acetal valves are more wear resistant than PVC valves.

Inlet Pipe Size	For Outlet Tube OD	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Color	Port-to-Port Lg.	For Use With	Piston Material	Spring Material	Seal Material		Each
3/8	1/4"	1.1	50 psi @ 70° F	1	-30 to 250	Gray	1 1/2"	Air, Water	Nylon	302 Stainless Steel	Buna-N	1866T137	000000
3/8	5/16"	1.1	50 psi @ 70° F	1	-30 to 250	Gray	1 9/16"	Air, Water	Nylon	302 Stainless Steel	Buna-N	1866T138	00000
3/8	3/8"	1.1	50 psi @ 70° F	1	-30 to 250	Gray	1 3/4"	Air, Water	Nylon	302 Stainless Steel	Buna-N	1866T139	00000
3/8	1/2"	1.1	50 psi @ 70° F	1	-30 to 250	Gray	2 1/16"	Air, Water	Nylon	302 Stainless Steel	Buna-N	1866T141	00000

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

Push-to-Connect Female

Inlet × NPT Male Outlet

Straight

Acetal valves are more wear resistant than PVC valves.

For Inlet Tube OD	Outlet Pipe Size	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Color	End-to-End Lg.	For Use With	Piston Material	Spring Material	Seal Material		Each
1/4"	3/8	1.1	50 psi @ 70° F	1	-30 to 250	Gray	1 1/16"	Air, Water	Nylon	302 Stainless Steel	Buna-N	1866T145	000000
5/16"	3/8	1.1	50 psi @ 70° F	1	-30 to 250	Gray	1 1/8"	Air, Water	Nylon	302 Stainless Steel	Buna-N	1866T157	00000
3/8"	3/8	1.1	50 psi @ 70° F	1	-30 to 250	Gray	1 7/16"	Air, Water	Nylon	302 Stainless Steel	Buna-N	1866T151	00000
1/2"	3/8	1.1	50 psi @ 70° F	1	-30 to 250	Gray	1 7/16"	Air, Water	Nylon	302 Stainless Steel	Buna-N	1866T146	00000

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

Push-to-Connect

Female Inlet × NPT

Male Outlet 90° Elbow

Acetal valves are more wear resistant than PVC valves.

For Inlet Tube OD	Outlet Pipe Size	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Color	Port-to-Port Lg.	For Use With	Piston Material	Spring Material	Seal Material		Each
1/4"	3/8	1.1	50 psi @ 70° F	1	-30 to 250	Gray	1 9/16"	Air, Water	Nylon	302 Stainless Steel	Buna-N	1866T161	000000
5/16"	3/8	1.1	50 psi @ 70° F	1	-30 to 250	Gray	1 9/16"	Air, Water	Nylon	302 Stainless Steel	Buna-N	1866T172	00000
3/8"	3/8	1.1	50 psi @ 70° F	1	-30 to 250	Gray	1 3/4"	Air, Water	Nylon	302 Stainless Steel	Buna-N	1866T166	00000
1/2"	3/8	1.1	50 psi @ 70° F	1	-30 to 250	Gray	2 1/16"	Air, Water	Nylon	302 Stainless Steel	Buna-N	1866T162	00000

Check Valves with Barbed Fittings

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 Body—Spring-Loaded Piston


Male, Barbed Fitting Connection, Male, NPT Thread	NPT Thread Male Barbed Fitting Connection Male

Nylon valves are more impact resistant than PVC or polypropylene valves.

	Pipe Size	For Outlet Tube ID	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Color	End-to-End Lg.	For Use With	Piston Material	Spring Material	Seal Material		Each
Barbed Male Inlet × NPT Male Outlet



	3/8"	3/8	—	Not Rated	Not Rated	1	-20 to 250	White	1 5/8"	Air, Water	Nylon	316 Stainless Steel	Buna-N	1371T104	000000


	1/2"	3/8	—	Not Rated	Not Rated	1	-20 to 250	White	1 9/16"	Air, Water	Nylon	316 Stainless Steel	Buna-N	1371T108	00000
	5/8"	3/8	—	Not Rated	Not Rated	1	-20 to 250	White	1 5/8"	Air, Water	Nylon	316 Stainless Steel	Buna-N	1371T112	00000


	NPT Male Inlet × Barbed Male Outlet



			—	3/8	3/8"	Not Rated	Not Rated	1	-20 to 250	White	1 5/8"	Air, Water	Nylon	316 Stainless Steel	Buna-N	1371T56	00000

Plastic Threaded Check Valves

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 Body—Spring-Loaded Piston

Female Inlet × Female

Outlet

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

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Color	End-to-End Lg.	Mounting Position	For Use With	Piston Material	Spring Material	Seal Material		Each
NPT Female Inlet × NPT Female Outlet



	3/8	4.2	125 psi @ 70° F	0.33	35 to 140	Black	2 1/16"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	Polypropylene	302 Stainless Steel	Buna-N	5492K12	000000

Air Compressor Air Flow Check Valves

Prevent air from escaping an air storage tank when the air compressor is not running. These valves install on the inlet of a tank. They open to allow airflow into the tank and close when flow stops or reverses direction. They have a _1/8 NPT tapped unloader port with removable plug for connecting to a pressure switch.

NPT Female Inlet × NPT Male Outlet

Image of Product. Front orientation. Contains Annotated. Air Flow Check Valves. Air Compressor Air Flow Check Valves, NPT Female Inlet × NPT Male Outlet.

Flow Coefficient (Cv)—Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve.

	Outlet Pipe Size	Flow Coefficient (Cv)	Min. Flow Rate	Max. Flow Rate, scfm	Max. Pressure, psi	Min. Opening Pressure, psi	Temp. Range, ° F	Overall Lg.	Hex Size		Each
Brass Body



	3/8	1/2	Not Rated	Not Rated	20	450	3	-15 to 400	2 11/16"	7/8"	2745N11	000000

Threaded Check Valves for Vacuum

Prevent vacuum loss with these airtight, leakproof valves. They open to allow flow in one direction and close when flow stops or reverses.

Anodized Aluminum Body

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	Vacuum Rating, in. Hg	For Use With	Ball Material	Spring Material	Seal Material		Each
NPT Female Inlet × NPT Female Outlet



	3/8	4.7	230 psi @ 200° F	0.3	0 to 200	2 1/8"	Any Angle, Horizontal, Vertical	0.6	Air	Acetal	Stainless Steel	Buna-N	1878N2	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.

Glass-Filled Polypropylene Body—Spring-Loaded Piston

Connector, Female Inlet ×

Female Outlet

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Color	End-to-End Lg.	Fitting Type	For Use With	Piston Material	Spring Material	Seal Material		Each
NPT Female × NPT Female



	3/8	4.2	125 psi @ 70° F	0.33	35 to 140	Black	2 1/16"	Connector	Diesel Fuel, Gasoline, Oil	Polypropylene	302 Stainless Steel	Fluoroelastomer	5492K52	000000

Heavy Duty Check Valves with Barbed Fittings

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.

Barbed Inlet × NPT Female Outlet

	Pipe Size	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	For Use With	Piston Material	Spring Material	Seal Material		Each
303 Stainless Steel Body



	3/8"	3/8	1.1	300 psi @ 70° F	2	-10 to 300	3 7/16"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	Fluoroelastomer	302 Stainless Steel	Fluoroelastomer	1357N66	000000

NPT Female Inlet × Barbed Outlet

	Pipe Size	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	For Use With	Piston Material	Spring Material	Seal Material		Each
303 Stainless Steel Body



	3/8"	3/8	1.1	300 psi @ 70° F	2	-10 to 300	3 7/16"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	Fluoroelastomer	302 Stainless Steel	Fluoroelastomer	1357N71	000000

High-Pressure Threaded Check Valves for Oil and Fuel

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.

Brass Body—Spring-Loaded Ball


Female Inlet × Female Outlet	Female Inlet × Male Outlet	Male Inlet × Female Outlet	Male Inlet × Male Outlet

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	For Use With	Ball Material	Spring Material	Seal Material		Each
NPT Female Inlet × NPT Female Outlet



	3/8	1.4	3,000 psi @ 70° F	1	-20 to 180	2 9/16"	Any Angle, Horizontal, Vertical	Diesel Fuel, Gasoline, Oil	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	8549T22	000000


	NPT Female Inlet × NPT Male Outlet



			3/8	1.1	3,000 psi @ 70° F	1	-20 to 180	2 11/16"	Any Angle, Horizontal, Vertical	Diesel Fuel, Gasoline, Oil	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	8549T24	00000


			NPT Male Inlet × NPT Female Outlet



					3/8	1.1	3,000 psi @ 70° F	1	-20 to 180	2 9/16"	Any Angle, Horizontal, Vertical	Diesel Fuel, Gasoline, Oil	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	8549T26	00000


					NPT Male Inlet × NPT Male Outlet



							3/8	1.1	3,000 psi @ 70° F	1	-20 to 180	2 11/16"	Any Angle, Horizontal, Vertical	Diesel Fuel, Gasoline, Oil	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	8549T28	00000

Heavy Duty Threaded Check Valves for Drinking Water

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.

Brass Body—Spring-Loaded Piston

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	Food Industry Std.	For Use With	Piston Material	Spring Material	Seal Material		Each
NPT Female Inlet × NPT Female Outlet



	3/8	4.55	400 psi @ 180° F	0.5	10 to 210	1 3/4"	Any Angle, Horizontal, Vertical	NSF/ANSI 61	Drinking Water	PEI	302 Stainless Steel	Buna-N	8517T32	000000

Check Valves for Steam

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.

316 Stainless Steel Body—Spring-Loaded Ball


	Repair Kits

Repair Kits—Repair kits include everything you need to rebuild the valve.

	Check Valves													Repair Kits
	Pipe Size	Flow Coefficient (Cv)	Max. Steam Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	For Use With	Ball Material	Spring Material	Seal Material		Each	For Pipe Size		Each
NPT Female Inlet × NPT Female Outlet



		3/8	1.21	125 psi @ 350° F	0.5	-5 to 350	2 1/8"	Horizontal, Vertical	Steam	PTFE	316 Stainless Steel	PTFE	47885K72	0000000	3/8	47885K12	000000

High-Temperature Threaded Check Valves for Oil and Fuel

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.

	Temp. Range, ° F	End-to-End Lg.	For Use With	Piston Material	Spring Material	Seal Material		Each
Bronze Body







	NPT Female × NPT Female

	3/8	300 psi @ 70° F	2	50 to 500	2 1/4"	Butane, Diesel Fuel, Fuel Oil, Natural Gas, Propane	Brass	316 Stainless Steel	Fluoroelastomer	4872K13	0000000

Vacuum Breakers

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

90° Elbow

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

Chrome-Plated Bronze Body—Chrome-plated bronze valves are more corrosion resistant than brass valves.

								Chrome-Plated Bronze Body
	Inlet Pipe Size	Outlet Pipe SIze	Max. Pressure @ Temp.	Temp. Range, ° F	Port-to-Port Lg.	Seal Material	For Use With		Each
NPT Female Inlet × NPT Female Outlet



		3/8	3/8	125 psi @ 70° F	35 to 180	1"	Silicone Rubber	Water	9903K33	000000

Straight

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

303 Stainless Steel Body—303 stainless steel valves have the best corrosion resistance.

								Brass Body		303 Stainless Steel Body
	Inlet Pipe Size	Outlet Pipe SIze	Max. Pressure @ Temp.	Temp. Range, ° F	End-to-End Lg.	Seal Material	For Use With		Each		Each
NPT Male Inlet × NPT Female Outlet



		1/2	3/8	300 psi @ 70° F	-20 to 365	1 3/4"	EPM Rubber	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	4817K14	0000000	4817K24	0000000

Socket-Connect Check Valves

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

Image of Product. Front orientation. Check Valves. Socket-Connect Check Valves.

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	Features	Specs. Met	For Use With	Disc Material	Seal Material		Each
Socket Connect × Socket Connect—Pressure Class 200



	3/8	5.5	200 psi @ 70° F	150 psi @ 350° F	0.5	-20 to 400	2 9/16"	Horizontal, Vertical	Removable Cap	ASTM A351	Argon, Helium, Krypton, Neon, Steam, Water, Xenon	316 Stainless Steel	PTFE	7766K52	000000

High-Temperature Threaded Check 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.

Bronze Body—Spring-Loaded Piston


1/8 to 1 1/4 Pipe Size Bronze	Repair Kit for 1/8 to 1 1/4 Pipe Size Bronze Valves

Use bronze valves when corrosion is not a concern.

Repair Kits—Repair kits include everything you need to rebuild the valve.

	Check Valves													Repair Kits
	Pipe Size	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	For Use With	Piston Material	Spring Material	Seal Material		Each	For Pipe Size		Each
NPT Female Inlet × NPT Female Outlet



		3/8	Not Rated	300 psi @ 70° F	2	50 to 500	2 1/4"	Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Xenon	Brass	316 Stainless Steel	Silicone Rubber	4872K301	000000	1/8, 1/4, 3/8	4872K106	000000