Butt Weld Check Valves | McMaster-Carr

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Fitting Connection

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For Use With

Material

Viton® Fluoroelastomer

Maximum Pressure @ Temperature

1,500 psi @ 100° F

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Vacuum

Minimum Opening Pressure

Connects To

Shape

Valve Type

Check Valve Type

End-to-End Length

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Pipe Schedule

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Viton® Fluoroelastomer

DFARS Specialty Metals

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Minimum Pressure

REACH

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

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5 Products

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.

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 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



	1/2	40	2.4	1,500 psi @ 100° F	0.5	-10 to 400	2 3/16"	Any Angle, Horizontal, Vertical	ASME B16.25	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	316 Stainless Steel	Viton® Fluoroelastomer	1971N11	0000000


	3/4	40	4.4	1,500 psi @ 100° F	0.5	-10 to 400	2 11/16"	Any Angle, Horizontal, Vertical	ASME B16.25	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	316 Stainless Steel	Viton® Fluoroelastomer	1971N12	000000
	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	000000
	1 1/2	40	18.8	1,500 psi @ 100° F	0.5	-10 to 400	3 15/16"	Any Angle, Horizontal, Vertical	ASME B16.25	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	316 Stainless Steel	Viton® Fluoroelastomer	1971N15	000000
	2	40	32	1,500 psi @ 100° F	0.5	-10 to 400	4 3/8"	Any Angle, Horizontal, Vertical	ASME B16.25	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	316 Stainless Steel	Viton® Fluoroelastomer	1971N16	000000