1 Check Valves | McMaster-Carr

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72 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



	1	8	400 psi @ 70° F	—	2	35 to 225	302 Stainless Steel	Buna-N	3 11/16"	Air, Argon, Helium, Krypton, Neon, Oil, Water, Xenon	7746K832	000000


	Brass Body—304 Stainless Steel Spring-Loaded Piston



			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	4753K44	00000


			Nickel-Plated Brass Body—303 Stainless Steel Spring-Loaded Piston



					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	4753K54	00000


					Bronze Body—PTFE Spring-Loaded Ball



							1	6	400 psi @ 70° F	125 psi @ 350° F	0.5	-20 to 405	Stainless Steel	PTFE	3 1/2"	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	47715K25	000000


							316 Stainless Steel Body—Fluoroelastomer Spring-Loaded Piston



									1	11.9	3,000 psi @ 70° F	—	1	-5 to 350	316 Stainless Steel	Fluoroelastomer	3 11/16"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	1874N19	00000


									316 Stainless Steel Body—316 Stainless Steel Spring-Loaded Ball



											1	6	400 psi @ 70° F	—	0.5	-5 to 350	316 Stainless Steel	Fluoroelastomer	3 1/2"	Air, Water	47885K65	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
Bronze Body—PTFE Spring-Loaded Ball



	1	6	400 psi @ 70° F	125 psi @ 350° F	0.5	-20 to 405	Stainless Steel	PTFE	3 7/8"	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	47715K45	0000000

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



	1	1 5/16"-12	11.2	3,000 psi @ 70° F	2	-5 to 350	4 5/8"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	Fluoroelastomer	1874N58	0000000

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



	1	13	400 psi @ 70° F	—	2	35 to 225	302 Stainless Steel	Buna-N	3 11/16"	Air, Argon, Helium, Krypton, Neon, Oil, Water, Xenon	7746K224	000000


	316 Stainless Steel Body—Fluoroelastomer Spring-Loaded Piston



			1	11.2	3,000 psi @ 70° F	—	2	-5 to 350	316 Stainless Steel	Fluoroelastomer	3 11/16"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	1874N41	00000


			316 Stainless Steel Body—316 Stainless Steel Spring-Loaded Piston



					1	9.088	580 psi @ 350° F	150 psi @ 212° F	4	0 to 355	302 Stainless Steel	Fluoroelastomer	3 9/16"	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	1958N16	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



	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	4753K104	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.

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



		1	31	200 psi @ 150° F	125 psi @ 353° F	0.5	-20 to 405	3 1/4"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Brass	Brass	4708K55	0000000	125	1	4708K21	000000


		NPT Female Inlet × NPT Female Outlet—Pressure Class 150



				1	22	300 psi @ 150° F	150 psi @ 366° F	0.5	-20 to 405	3 11/16"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Brass	Brass	9773K55	000000	—	—	———	0


				NPT Female Inlet × NPT Female Outlet—Pressure Class 200



						1	22	400 psi @ 150° F	200 psi @ 388° F	0.5	-20 to 550	3 11/16"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K65	000000	200, 300	1	9770K111	00000


						NPT Female Inlet × NPT Female Outlet—Pressure Class 300



								1	22	600 psi @ 150° F	300 psi @ 422° F	0.5	-20 to 550	3 11/16"	Horizontal, Vertical	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	9770K75	000000	200, 300	1	9770K111	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



	1	106	200 psi @ 70° F	150 psi @ 350° F	0.5	-20 to 400	3 9/16"	Horizontal, Vertical	Removable Cap	Air, Steam, Water	316 Stainless Steel	PTFE	46635K66	000000

Easy-Install Threaded Check Valves for Harsh Chemicals

To reduce installation time and allow for maintenance without detaching pipe connections, these valves have union fittings. The plastic body and fluoroelastomer seal provide excellent chemical resistance. Valves open to allow flow in one direction and close when flow stops or reverses.

PVC Body—Ball


Assembled View	Exploded View

PVC and CPVC valves come with unthreaded socket-connect female fittings in addition to the threaded NPT female fittings.

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
BSPP Female × BSPP Female



	1	25	150 psi @ 70° F	1	40 to 140	Dark Gray	5 3/16"	Horizontal, Vertical	ASTM D1784	—	Butane, Kerosene, Liquid Carbon Dioxide, Natural Gas, Nitric Acid, Oxygen, Phosphoric Acid, Propane, Salt Water, Soap Solutions, Water	PVC	Fluoroelastomer	7909K93	0000000


	NPT Female × NPT Female



			1	11	150 psi @ 70° F	1	40 to 140	Dark Gray	5 3/8"	Horizontal, Vertical	ASTM D1784	NSF/ANSI 61	Citric Acid, Diesel Fuel, Drinking Water, Ethylene Glycol, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Nitric Acid, Oil, Phosphoric Acid, Salt Water, Sodium Hypochlorite (Bleach), Water	PVC	Fluoroelastomer	4721K15	00000

CPVC Body—Ball


Assembled View	Exploded View

PVC and CPVC valves come with unthreaded socket-connect female fittings in addition to the threaded NPT female fittings.

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 × NPT Female



	1	11	150 psi @ 70° F	1	35 to 190	Light Gray	5 3/8"	Horizontal, Vertical	ASTM D1784	NSF/ANSI 61	Citric Acid, Diesel Fuel, Drinking Water, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Nitric Acid, Phosphoric Acid, Salt Water, Sodium Hypochlorite (Bleach), Water	CPVC	Fluoroelastomer	4810K33	0000000

Polypropylene Body—Ball


Assembled View	Exploded View

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

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



	1	11	150 psi @ 70° F	1	35 to 160	White	5 3/8"	Horizontal, Vertical	ASTM D4101	Air, Ammonia, Butane, Carbon Dioxide, Citric Acid, Deionized Water, Ethanol, Ethylene Glycol, Isopropyl Alcohol, Kerosene, Methanol (Methyl Alcohol), Natural Gas, Oil, Oxygen, Phosphoric Acid, Salt Water, Soap Solutions, Sodium Hydroxide (Caustic Soda), Water	Polypropylene	Fluoroelastomer	4851K43	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



	1	30	200 psi @ 70° F	150 psi @ 350° F	0.5	-20 to 400	3 9/16"	Horizontal, Vertical	Removable Cap	ASTM A351	Argon, Helium, Krypton, Neon, Steam, Water, Xenon	316 Stainless Steel	PTFE	7766K55	0000000

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



		1	Not Rated	300 psi @ 70° F	2	50 to 500	3 3/8"	Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Xenon	Brass	316 Stainless Steel	Silicone Rubber	4872K601	0000000	1	4872K103	0000000

303 Stainless Steel Body—Poppet


	Repair Kit for 1 1/2 to 3 Pipe Size Bronze Valves and 303 Stainless Steel Valves

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

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	Spring Material	Seal Material		Each	For Pipe Size		Each
NPT Female Inlet × NPT Female Outlet



		1	8	600 psi @ 70° F	1	0 to 500	3 11/16"	Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Oil, Water, Xenon	302 Stainless Steel	Fluoroelastomer	7295N117	0000000	1	7295N123	000000

Threaded Check Valves for Drinking Water

These valves meet NSF/ANSI 61 for drinking water service. They open to allow flow in one direction and close when flow stops or reverses.

PVC Body—Spring-Loaded Piston

Spring-loaded piston check valves reduce slamming and vibration in quick shut-off applications.

										White
	Pipe Size	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	For Use With	Piston Material	Spring Material	Seal Material		Each
NPT Female × NPT Female



		1	200 psi @ 70° F	0.5	35 to 140	5 1/4"	Drinking Water	PVC	302 Stainless Steel	EPDM	46835K34	000000

PVC Body—Swing

Swing check valves create less flow resistance than spring-loaded piston check valves.

Clear—Clear valves let you visually inspect flow and debris accumulation.

									White		Clear
	Pipe Size	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	For Use With	Disc Material	Seal Material		Each		Each
NPT Female × NPT Female



		1	125 psi @ 70° F	0.5	35 to 140	5 1/8"	Drinking Water	EPDM	EPDM	45275K44	000000	6274T84	000000

Socket-Connect Check Valves for Drinking Water

Insert unthreaded pipe into the socket ends and bond with primer and cement to create a permanent, leak-tight connection. These valves meet NSF/ANSI 61, which means they’re safe to use with drinking water. They open to allow flow in one direction and close when flow stops or reverses.

PVC Body—Spring-Loaded Piston

Spring-loaded piston check valves reduce slamming and vibration in quick shut-off applications.

											White
	Pipe Size	For Pipe Schedule	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	For Use With	Piston Material	Spring Material	Seal Material		Each
Socket Connect × Socket Connect



		1	40	200 psi @ 70° F	0.5	35 to 140	5 1/4"	Drinking Water	PVC	302 Stainless Steel	EPDM	46835K54	000000

PVC Body—Swing

Swing check valves create less flow resistance than spring-loaded piston check valves.

Clear—Clear valves let you visually inspect flow and debris accumulation.

										White		Clear
	Pipe Size	For Pipe Schedule	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	For Use With	Disc Material	Seal Material		Each		Each
Socket Connect × Socket Connect



		1	40	125 psi @ 70° F	0.5	35 to 140	5 1/8"	Drinking Water	EPDM	EPDM	45275K54	000000	6274T94	000000

Socket-Connect Check Valves for Harsh Chemicals

Insert unthreaded pipe into the socket ends and bond with primer and cement to create a permanent, leak-tight connection. These valves have a plastic body and a fluoroelastomer seal for excellent chemical resistance. They open to allow flow in one direction and close when flow stops or reverses.

PVC Body—Spring-Loaded Piston

Image of Product. Front orientation. Check Valves. Socket-Connect Check Valves for Harsh Chemicals.

	For Pipe Schedule	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Color	End-to-End Lg.	Mounting Position	Specs. Met	For Use With	Piston Material	Spring Material	Seal Material		Each
Socket Connect × Socket Connect—Pressure Class Not Rated



	1	40, 80	9	150 psi @ 70° F	2	40 to 140	Dark Gray	5 3/16"	Horizontal, Vertical	ASTM D1784	Citric Acid, Deionized Water, Diesel Fuel, Ethylene Glycol, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Mineral Spirits, Nitric Acid, Oil, Phosphoric Acid, Salt Water, Sodium Hypochlorite (Bleach), Water	PVC	PVC	Fluoroelastomer	1939N3	0000000

CPVC Body—Spring-Loaded Piston

	For Pipe Schedule	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Color	End-to-End Lg.	Mounting Position	Specs. Met	For Use With	Piston Material	Spring Material	Seal Material		Each
Socket Connect × Socket Connect—Pressure Class Not Rated



	1	40, 80	9	150 psi @ 70° F	2	40 to 190	Light Gray	5 3/16"	Horizontal, Vertical	ASTM D1784	Citric Acid, Deionized Water, Diesel Fuel, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Mineral Spirits, Nitric Acid, Oil, Phosphoric Acid, Salt Water, Sodium Hypochlorite (Bleach), Water	CPVC	CPVC	Fluoroelastomer	1939N13	0000000

Compact Flange-Mount Check Valves

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.

316 Stainless Steel Body—Spring-Loaded Piston


Shown with Flanges (Not Included)

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



	1	6.1	720 psi @ 100° F	0.5	-10 to 400	1/4"	Any Angle, Horizontal, Vertical	150, 300	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	316 Stainless Steel	Viton® Fluoroelastomer	1969N13	0000000

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



		1	6	125 psi @ 350° F	0.5	-5 to 350	3 1/2"	Horizontal, Vertical	Steam	PTFE	316 Stainless Steel	PTFE	47885K75	0000000	1	47885K15	000000

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



	1	16.9	400 psi @ 170° F	0.5	10 to 210	2 7/8"	Any Angle, Horizontal, Vertical	NSF/ANSI 61	Drinking Water	PEI	302 Stainless Steel	Buna-N	8517T25	000000

High-Performance Threaded Check Valves for Fuel

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. All have a removable cap that provides easy access to internal components for maintenance.

Steel Body—Spring-Loaded Piston

Image of Product. Front orientation. Check Valves. High-Performance Threaded Check Valves for Fuel.

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	Features	Specs. Met	For Use With	Piston Material	Spring Material	Seal Material		Each
NPT Female Inlet × NPT Female Outlet—Pressure Class 800



	1	5.08	1,975 psi @ 100° F	45	-20 to 800	4 3/8"	Any Angle, Horizontal, Vertical	Removable Cap	API Std 598, API Std 602, ASME B16.34	Diesel Fuel, Natural Gas	420 Stainless Steel	304 Stainless Steel	304 Stainless Steel/Graphite	4895K65	0000000

Steel Body—Spring-Loaded Ball

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

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	Features	Specs. Met	For Use With	Ball Material	Spring Material	Seal Material		Each
NPT Female Inlet × NPT Female Outlet—Pressure Class 800



	1	5.08	1,975 psi @ 100° F	107	-20 to 800	4 3/8"	Any Angle, Horizontal, Vertical	Removable Cap	API Std 598, API Std 602, ASME B16.34	Diesel Fuel, Natural Gas	304 Stainless Steel	304 Stainless Steel	304 Stainless Steel/Graphite	4618K73	0000000

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 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



	1	4.48	2,000 psi @ 70° F	0.33	-5 to 350	4 1/4"	Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	7838K58	0000000

High-Cycling Threaded Check Valves

With few moving parts to wear out, these valves withstand frequent opening and closing, pulsating flow, and rapid flow reversal. 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.

Bronze Body

Image of Product. Front orientation. Check Valves. High-Cycling Threaded 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
NPT Female Inlet × NPT Female Outlet—Pressure Class 125



	1	8.86	200 psi @ 70° F	175 psi @ 353° F	2	-20 to 405	3 1/16"	Horizontal	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	4894K13	0000000


	NPT Female Inlet × NPT Female Outlet—Pressure Class 300



			1	8.86	1,000 psi @ 70° F	520 psi @ 421° F	2	-20 to 450	3 1/2"	Horizontal	Removable Cap	MSS SP-80	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	Bronze	Bronze	4894K83	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



	3/4	1	Not Rated	Not Rated	60	450	3	-15 to 400	3 11/16"	1 5/16"	2745N14	000000


	1	1	Not Rated	Not Rated	60	450	3	-15 to 400	4 1/8"	1 1/2"	2745N15	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



	3/4"	1	—	Not Rated	Not Rated	1	-20 to 250	White	2 5/16"	Air, Water	Nylon	316 Stainless Steel	Buna-N	1371T117	000000


	NPT Male Inlet × Barbed Male Outlet



			—	1	3/4"	Not Rated	Not Rated	1	-20 to 250	White	2 5/16"	Air, Water	Nylon	316 Stainless Steel	Buna-N	1371T131	00000

Threaded Two-Stage Backflow-Prevention Valves for Drinking Water


Double Union	Single-Union Female Inlet × Female Outlet

Keep backflow from contaminating your drinking water supply—these valves meet NSF/ANSI 61 for use with drinking water. They consist of a primary check valve and a secondary check valve. If the primary check fails to close when flow stops or reverses, the secondary check valve engages to prevent backflow.

Double Union—Double-union valves have a union fitting on both ends.

Single Union—Single-union valves have a union fitting on one end.

	Temp. Range, ° F	End-to-End Lg.	Food Industry Std.	For Use With	Seal Material		Each
Brass Body—Dual Check, Single Union







	NPT Female Inlet × NPT Female Outlet

	1	175 psi @ 180° F	5	35 to 180	3 3/4"	NSF/ANSI 61	Drinking Water	EPDM	49235K82	000000


	Brass Body—Dual Check, Double Union







					NPT Female Inlet × NPT Female Outlet

					1	175 psi @ 180° F	5	35 to 180	4"	NSF/ANSI 61	Drinking Water	EPDM	9117K43	000000

Flanged Check Valves for Harsh Chemicals

Bolt these valves to ANSI flanges. The glass-filled vinyl ester 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.

Glass-Filled Vinyl Ester Body—Ball

Image of Product. Front orientation. Check Valves. Flanged Check Valves for Harsh Chemicals.

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Color	End-to-End Lg.	Mounting Position	For Flange Class	Flange OD	No. of Bolt Holes	Bolt Hole Size	Bolt Circle Dia.	Bolts Included	Specs. Met	For Use With	Ball Material	Seal Material		Each
Flanged × Flanged



	1	35	200 psi @ 250° F	1	-40 to 250	Beige	5"	Vertical	150	4 1/4"	4	5/8"	3 1/8"	No	ASME B16.10, ASME B16.5	Ammonia, Chlorine, Citric Acid, Deionized Water, Diesel Fuel, Ethanol, Ethylene Glycol, Fuel Oil, Gasoline, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Methanol (Methyl Alcohol), Methyl Ethyl Ketone (MEK), Mineral Spirits, Oil, Phosphoric Acid, Salt Water, Soap Solutions, Toluene (Methylbenzene), Water, Xylene	PTFE	PTFE	1869N1	0000000

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.

Steel Body—Spring-Loaded Piston

Image of Product. Front orientation. Check Valves. Socket-Connect Check Valves for Oil and Fuel.

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	Features	Specs. Met	For Use With	Piston Material	Spring Material	Seal Material		Each
Socket Connect × Socket Connect—Pressure Class 800



	1	5.08	1,975 psi @ 100° F	45	-20 to 800	4 3/8"	Any Angle, Horizontal, Vertical	Removable Cap	API Std 598, API Std 602, ASME B16.34	Diesel Fuel, Gasoline, Natural Gas, Oil	420 Stainless Steel	304 Stainless Steel	304 Stainless Steel/Graphite	4895K85	0000000

Steel Body—Spring-Loaded Ball

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

	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	Features	Specs. Met	For Use With	Ball Material	Spring Material	Seal Material		Each
Socket Connect × Socket Connect—Pressure Class 800



	1	5.08	1,975 psi @ 100° F	107	-20 to 800	4 3/8"	Any Angle, Horizontal, Vertical	Removable Cap	API Std 598, API Std 602, ASME B16.34	Diesel Fuel, Natural Gas	304 Stainless Steel	304 Stainless Steel	304 Stainless Steel/Graphite	4618K83	0000000

Butt-Weld Check Valves

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.

316 Stainless Steel Body—Spring-Loaded Piston

Image of Product. Front orientation. Check Valves. Butt-Weld Check Valves.

	For Pipe Schedule	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	Specs. Met	For Use With	Piston Material	Spring Material	Seal Material		Each
Butt Weld × Butt Weld



	1	40	6.1	1,500 psi @ 100° F	0.5	-10 to 400	2 15/16"	Any Angle, Horizontal, Vertical	ASME B16.25	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	316 Stainless Steel	Viton® Fluoroelastomer	1971N13	0000000

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

	1	300 psi @ 70° F	2	50 to 500	3 3/8"	Butane, Diesel Fuel, Fuel Oil, Natural Gas, Propane	Brass	316 Stainless Steel	Fluoroelastomer	4872K16	0000000

Clear-View Socket-Connect Check Valves

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.

PVC Body

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

	For Pipe Schedule	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Color	End-to-End Lg.	Mounting Position	Features	Specs. Met	For Use With	Piston Material	Seal Material		Each
Socket Connect × Socket Connect



	1	40, 80	21	150 psi @ 70° F	0.29	35 to 140	Clear	6 7/8"	Any Angle, Horizontal, Vertical	Removable Cap	ASTM D1784, ASTM D1785	Air, Water	PVC	EPDM	4754K54	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



	1"	1	11.9	300 psi @ 70° F	2	30 to 300	4 1/4"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	Fluoroelastomer	302 Stainless Steel	Fluoroelastomer	1357N1	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



	1"	1	11.9	300 psi @ 70° F	2	30 to 300	4 1/4"	Air, Argon, Helium, Krypton, Neon, Water, Xenon	Fluoroelastomer	302 Stainless Steel	Fluoroelastomer	1357N12	000000

Union-Insert Check Valves

To reduce installation time and allow for maintenance without detaching pipe connections, these valves insert into a union fitting. Union fittings are sold separately. Valves open to allow flow in one direction and close when flow stops or reverses. Body is 316 stainless steel for excellent corrosion resistance.

316 Stainless Steel Body—Spring-Loaded Piston


Shown with Union Fitting (Sold Separately)

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



		1	6.1	1,500 psi @ 70° F	0.5	-10 to 400	1 1/16"	Horizontal, Vertical	ASTM A479	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	316 Stainless Steel	Fluoroelastomer	8615T36	0000000	8615T56	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.

								Brass 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



		1	1	125 psi @ 70° F	35 to 180	1 5/8"	Silicone Rubber	Water	47685K36	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	3/4	300 psi @ 70° F	-20 to 365	2 3/8"	EPM Rubber	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	4817K16	0000000	4817K26	0000000

Clear-View Socket-Connect Check Valves for Harsh Chemicals

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. Valves have a PVC body and a fluoroelastomer seal for excellent chemical resistance. 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.

PVC Body

Image of Product. Front orientation. Check Valves. Clear-View Socket-Connect Check Valves for Harsh Chemicals.

	For Pipe Schedule	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Color	End-to-End Lg.	Mounting Position	Features	Specs. Met	For Use With	Piston Material	Seal Material		Each
Socket Connect × Socket Connect



	1	40, 80	21	150 psi @ 70° F	0.29	35 to 140	Clear	6 7/8"	Any Angle, Horizontal, Vertical	Removable Cap	ASTM D1784, ASTM D1785	Carbon Dioxide, Citric Acid, Deionized Water, Diesel Fuel, Hydrochloric Acid, Methanol (Methyl Alcohol), Nitric Acid, Phosphoric Acid, Salt Water, Sulfuric Acid, Water	PVC	Fluoroelastomer	4754K44	000000

Pipeline Flame Arresters

To prevent flashback in flammable gas pipelines, an internal flame-arresting element absorbs the heat from a fire to extinguish the flame. These valves are commonly used in pilot lines connected to waste gas burners.

	End-to-End Lg.	For Use With	Flame-Arresting Element Material		Each
Aluminum Body







	NPT Female

	1	25 psi @ 176° F	176	3 3/4"	Butane, Natural Gas, Propane	316 Stainless Steel	4717K34	0000000

High-Pressure Vacuum Breakers

Rated for 12 times the pressure of standard vacuum-breaking valves, these can handle up to 1,500 psi. Also known as vacuum-breaking valves, they have vents that open when pressure drops to relieve vacuum conditions and prevent backward suction from drawing liquid into upstream piping. Body is 316 stainless steel for excellent corrosion resistance.

									316 Stainless Steel Body
	Inlet Pipe Size	Outlet Pipe SIze	Flow Coefficient (Cv)	Max. Pressure @ Temp.	End-to-End Lg.	Specs. Met	Seal Material	For Use With	Temp. Range, ° F		Each
NPT Female Inlet × NPT Male Outlet



		3/4	1	6.6	1,500 psi @ 70° F	1 7/8"	ASME B1.20.1	Fluoroelastomer	Air, Argon, Helium, Krypton, Neon, Oil, Water, Xenon	-10 to 400	8537T76	0000000

Easy-Maintenance Threaded Two-Stage Backflow-Prevention Valves for Drinking Water

Image of Product. Front orientation. Backflow-Prevention Valves. Easy-Maintenance Threaded Two-Stage Backflow-Prevention Valves for Drinking Water, Dual Check.

Dual Check

Reduced Pressure Zone

Integral shutoff valves isolate flow for inline maintenance, and a top-entry cover provides easy access to internal components. These valves meet NSF/ANSI 61 for use with drinking water. For maximum protection from system contamination, they consist of a primary check valve and a secondary check valve. If the first check fails to close when flow stops or reverses, the secondary check valve engages to prevent backflow. A strainer prevents debris from blocking the check valves.

Reduced Pressure Zone—Reduced-pressure-zone valves have a relief valve that discharges backflow if both check valves fail.

Air Inlet—Valves with an air inlet provide high-capacity relief in emergency conditions. If both check valves fail, the inlet introduces air to quickly displace liquid for faster discharge through the relief valve.

	Temp. Range, ° F	End-to-End Lg.	Features	Specs. Met	Food Industry Std.	Certification	For Use With	Seal Material		Each
Bronze Body—Dual Check







	NPT Female Inlet × NPT Female Outlet

	1	175 psi @ 180° F	30	35 to 180	17"	Strainer	ASSE 1015	NSF/ANSI 61	CSA Certified, USC Foundation Approved	Drinking Water	Buna-N	4775K63	0000000


	Bronze Body—Reduced Pressure Zone







					NPT Female Inlet × NPT Female Outlet

					1	175 psi @ 140° F	30	35 to 140	19 5/8"	Air Inlet, Relief Valve, Strainer	ASSE 1013	NSF/ANSI 61	USC Foundation Approved	Drinking Water	Buna-N	4777K82	00000000


					1	175 psi @ 180° F	30	35 to 180	18 1/4"	Relief Valve, Strainer	ASSE 1013	NSF/ANSI 61	USC Foundation Approved	Drinking Water	Buna-N	45265K42	000000

Vacuum Breakers for Chemicals

A plastic body withstands pH neutralizing, cleaning, and plating solutions containing sodium hydroxide, methyl ethyl ketone, and other harsh chemicals. 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.

Diaphragm Check Valve

								Material			CPVC Body				PVC Body
	Inlet Pipe Size	Outlet Pipe SIze	For Pipe Schedule	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Min. Opening Pressure, psi	End-to-End Lg.	Seal	DIaphragm	For Use With	Temp. Range, ° F	Color		Each	Temp. Range, ° F	Color		Each
NPT Female Inlet × NPT Female Outlet



		1	1	80	Not Rated	100 psi @ 75° F	1	5 1/8"	Fluoroelastomer	Fluoroelastomer	Beverage, Food, Air, Ammonia, Argon, Carbon Dioxide, Chlorinated Water, Diesel Fuel, Drinking Water, Ethylene Glycol, Helium, Hydrochloric Acid, Kerosene, Krypton, Liquid Carbon Dioxide, Methanol (Methyl Alcohol), Methyl Ethyl Ketone (MEK), Mineral Spirits, Natural Gas, Neon, Nitric Acid, Nitrogen, Oil, Oxygen, Soap Solutions, Sodium Hydroxide (Caustic Soda), Sodium Hypochlorite (Bleach), Water, Xenon	40 to 180	Light Gray	1868N15	0000000	40 to 140	Gray	1868N12	0000000