Diaphragm Check Valves | McMaster-Carr

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43 Products

High-Cycling Check Valves

With internal components that resist wear from frequent operation, these valves can cycle as often as once per second. Barbed fittings and unthreaded fittings grip onto tubing, providing a secure hold. All valves open to allow flow in one direction and close when flow stops or reverses.

Nylon Body


NPT Male Inlet × Barbed Male Outlet	Barbed Male Inlet × Barbed Male Outlet	Unthreaded Male Inlet x Unthreaded Male Outlet

Nylon valves are more impact resistant than polypropylene valves.

	For Tube ID	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Diaphragm Material	Seal Material	Color	End-to-End Lg.	For Use With		Each
Barbed Male Inlet × Barbed Male Outlet



	—	1/8"	50 psi @ 65° F	0.5	-60 to 200	Silicone Rubber	Silicone Rubber	Off-White	1 1/4"	Air, Water	47245K111	00000


	—	3/16"	15 psi @ 70° F	0.5	-20 to 250	Fluoroelastomer	Fluoroelastomer	Black	1 11/16"	Air, Water	47245K17	0000
	—	3/16"	15 psi @ 70° F	0.5	-20 to 250	Fluorosilicone	Fluorosilicone	Black	1 11/16"	Air, Water	47245K26	0000
	—	1/4"	15 psi @ 70° F	0.5	-60 to 200	Fluorosilicone	Fluorosilicone	Black	1 9/16"	Air, Water	47245K47	0000
	—	5/16"	15 psi @ 70° F	0.5	-20 to 250	Fluorosilicone	Fluorosilicone	Black	1 9/16"	Air, Water	47245K24	0000
	—	3/8"	50 psi @ 65° F	0.5	-60 to 200	Silicone Rubber	Silicone Rubber	Off-White	1 7/8"	Air, Water	47245K112	0000
	—	3/8"	15 psi @ 70° F	0.5	-20 to 250	Fluoroelastomer	Fluoroelastomer	Black	1 9/16"	Air, Water	47245K131	0000


	Unthreaded Male Inlet × Unthreaded Male Outlet



			—	1/8"	15 psi @ 70° F	0.5	-20 to 250	Fluorosilicone	Fluorosilicone	Black	1 5/8"	Air, Water	47245K25	0000


			NPT Male Inlet × Barbed Male Outlet



					1/8	1/8"	50 psi @ 65° F	0.5	-60 to 200	Silicone Rubber	Silicone Rubber	Off-White	1 3/8"	Air, Water	2987K35	0000


					1/8	3/16"	50 psi @ 65° F	0.5	-60 to 200	Silicone Rubber	Silicone Rubber	Off-White	1 9/16"	Air, Water	2987K36	0000
					1/8	3/8"	50 psi @ 65° F	0.5	-60 to 200	Silicone Rubber	Silicone Rubber	Off-White	1 5/8"	Air, Water	2987K38	0000

Polypropylene Body


NPT Male Inlet × Barbed Male Outlet	Barbed Male Inlet × Barbed Male Outlet	Unthreaded Male Inlet x Unthreaded Male Outlet

Polypropylene valves are more corrosion resistant than nylon valves.

	For Tube ID	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Diaphragm Material	Seal Material	Color	End-to-End Lg.	For Use With		Each
Barbed Male Inlet × Barbed Male Outlet



	—	1/8"	50 psi @ 65° F	0.5	32 to 250	Fluoroelastomer	Fluoroelastomer	Off-White	1 1/4"	Air, Water	47245K114	00000


	—	3/16"	15 psi @ 70° F	0.5	-20 to 250	Fluoroelastomer	Fluoroelastomer	White	1 11/16"	Air, Water	47245K12	0000
	—	1/4"	15 psi @ 70° F	0.5	-40 to 150	Fluorosilicone	Fluorosilicone	Black	1 9/16"	Air, Water	47245K139	0000
	—	1/4"	15 psi @ 70° F	0.5	-40 to 250	Fluoroelastomer	Fluoroelastomer	Off-White	1 9/16"	Air, Water	47245K43	0000
	—	5/16"	15 psi @ 70° F	0.5	-20 to 250	Fluoroelastomer	Fluoroelastomer	Black	1 3/4"	Air, Water	47245K14	0000
	—	3/8"	50 psi @ 65° F	0.5	32 to 250	Fluoroelastomer	Fluoroelastomer	Off-White	1 7/8"	Air, Water	47245K117	0000
	—	3/8"	15 psi @ 70° F	0.5	-20 to 250	Fluorosilicone	Fluorosilicone	Black	1 9/16"	Air, Water	47245K132	0000


	Unthreaded Male Inlet × Unthreaded Male Outlet



			—	1/8"	15 psi @ 70° F	0.5	-20 to 250	Fluoroelastomer	Fluoroelastomer	White	1 5/8"	Air, Water	47245K11	0000


			—	1/8"	15 psi @ 70° F	0.5	-20 to 250	Fluorosilicone	Fluorosilicone	Black	1 5/8"	Air, Water	47245K128	0000


			NPT Male Inlet × Barbed Male Outlet



					1/8	1/8"	50 psi @ 65° F	0.5	32 to 250	Fluoroelastomer	Fluoroelastomer	Off-White	1 3/8"	Air, Water	47245K124	0000


					1/8	3/16"	50 psi @ 65° F	0.5	32 to 250	Fluoroelastomer	Fluoroelastomer	Off-White	1 1/2"	Air, Water	47245K122	0000
					1/8	1/4"	50 psi @ 65° F	0.5	32 to 250	Fluoroelastomer	Fluoroelastomer	Off-White	1 1/2"	Air, Water	47245K126	0000
					1/8	3/8"	50 psi @ 65° F	0.5	32 to 250	Fluoroelastomer	Fluoroelastomer	Off-White	1 5/8"	Air, Water	47245K119	0000

Polycarbonate Body


NPT Male Inlet × Barbed Male Outlet	Barbed Male Inlet × Barbed Male Outlet

Polycarbonate valves are clear so you can monitor your line.

	For Tube ID	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Diaphragm Material	Seal Material	Color	End-to-End Lg.	For Use With		Each
Barbed Male Inlet × Barbed Male Outlet



	—	1/8"	50 psi @ 65° F	0.5	-80 to 275	Silicone Rubber	Silicone Rubber	Clear	1 1/4"	Air, Water	47245K115	00000


	—	3/16"	50 psi @ 65° F	0.5	-80 to 275	Silicone Rubber	Silicone Rubber	Clear	1 11/16"	Air, Water	47245K113	0000
	—	1/4"	50 psi @ 65° F	0.5	-80 to 275	Silicone Rubber	Silicone Rubber	Clear	1 5/8"	Air, Water	47245K116	0000
	—	3/8"	50 psi @ 65° F	0.5	-80 to 275	Silicone Rubber	Silicone Rubber	Clear	1 15/16"	Air, Water	47245K118	0000


	NPT Male Inlet × Barbed Male Outlet



			1/8	1/8"	50 psi @ 65° F	0.5	-80 to 275	Silicone Rubber	Silicone Rubber	Clear	1 3/8"	Air, Water	47245K125	0000


			1/8	3/16"	50 psi @ 65° F	0.5	-80 to 275	Silicone Rubber	Silicone Rubber	Clear	1 1/2"	Air, Water	47245K123	0000
			1/8	1/4"	50 psi @ 65° F	0.5	-80 to 275	Silicone Rubber	Silicone Rubber	Clear	1 1/2"	Air, Water	47245K127	0000
			1/8	3/8"	50 psi @ 65° F	0.5	-80 to 275	Silicone Rubber	Silicone Rubber	Clear	1 5/8"	Air, Water	47245K121	0000

Check Valves with Luer Lock Fittings


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

Also known as luer lock couplings, luer lock fittings consist of a plug and a socket that connect with a half turn, so you can easily connect and disconnect your line. These valves open to allow flow in one direction and close when flow stops or reverses. The clear body allows you to visually inspect flow and debris accumulation.

	Temp. Range, ° F	Color	End-to-End Lg.	For Use With	Diaphragm Material	Seal Material		Each
Polycarbonate Body







	Luer Lock

	Female Inlet × Female Outlet	50 psi @ 65° F	0.5	-80 to 275	Clear	1"	Air, Water	Silicone Rubber	Silicone Rubber	2141N4	00000


	Female Inlet × Male Outlet	50 psi @ 65° F	0.5	-80 to 275	Clear	1 1/4"	Air, Water	Silicone Rubber	Silicone Rubber	2141N3	0000
	Male Inlet × Female Outlet	50 psi @ 65° F	0.5	-80 to 275	Clear	1 1/4"	Air, Water	Silicone Rubber	Silicone Rubber	2141N2	0000
	Male Inlet × Male Outlet	50 psi @ 65° F	0.5	-80 to 275	Clear	1 1/2"	Air, Water	Silicone Rubber	Silicone Rubber	2141N1	0000

Check Valves with Barbed Fittings for Harsh Chemicals

Prevent backflow in chemical tubing lines. These valves have barbed fittings that grip onto tubing, providing a secure hold. 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.

PVDF Body—Diaphragm

PVDF valve resists abrasion and UV light.

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.

	For Tube ID	Max. Pressure @ Temp.	Min. Opening Pressure, psi	Temp. Range, ° F	Color	End-to-End Lg.	Mounting Position	For Use With	Diaphragm Material	Seal Material		Each
Barbed Male Inlet × Barbed Male Outlet



	Not Rated	1/4"	15 psi @ 70° F	0.5	-20 to 250	White	1 21/32"	Horizontal	Air, Butane, Chlorine, Citric Acid, Deionized Water, Diesel Fuel, Ethanol, Ethylene Glycol, Gasoline, Hydrochloric Acid, Nitric Acid, Oil, Propane, Salt Water, Soap Solutions, Sodium Hypochlorite (Bleach), Sulfuric Acid, Water	Fluoroelastomer	Fluoroelastomer	47245K37	00000

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



		1/2	1/2	80	Not Rated	100 psi @ 75° F	1	4 5/16"	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	1868N13	0000000	40 to 140	Gray	1868N1	0000000


		3/4	3/4	80	Not Rated	100 psi @ 75° F	1	4 5/8"	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	1868N14	000000	40 to 140	Gray	1868N11	000000
		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	000000	40 to 140	Gray	1868N12	000000