Yor-Lok Check Valves | McMaster-Carr

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Fitting Connection

Yor-Lok

System of Measurement

Tube OD

Body Material

Material

Connects To

Pipe Size

Piston Material

Minimum Opening Pressure

0.33 psi

1 psi

Maximum Pressure @ Temperature

For Use With

Spring Material

Fitting Type

Gender

Shape

Mounting Position

Thread Type

Valve Type

Maximum Temperature

Seal Material

Actuation

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

REACH

RoHS

Compliant with Exemptions

Export Control Classification Number (ECCN)

2B999

EAR99

DFARS Specialty Metals

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18 Products

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.

Brass Body—Spring-Loaded Piston

Yor Lok Female Inlet ×

Yor Lok Female Outlet

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.	Min. Opening Pressure, psi	Temp. Range, ° F	End-to-End Lg.	Mounting Position	For Use With	Piston Material	Spring Material	Seal Material		Each
Yor-Lok Female Inlet × Yor-Lok Female Outlet



	1/8"	0.22	3,000 psi @ 70° F	1	-30 to 275	2 3/8"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	Brass	316 Stainless Steel	Buna-N	1056T1	000000


	1/4"	0.75	3,000 psi @ 70° F	1	-30 to 275	2 1/2"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	Brass	316 Stainless Steel	Buna-N	1056T2	00000
	3/8"	2.09	2,300 psi @ 70° F	1	-30 to 275	3 3/8"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	Brass	316 Stainless Steel	Buna-N	1056T3	000000
	1/2"	3.3	2,200 psi @ 70° F	1	-30 to 275	4 1/8"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	Brass	316 Stainless Steel	Buna-N	1056T4	000000
	3/4"	6.01	1,900 psi @ 70° F	1	-30 to 275	4 3/8"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	Brass	316 Stainless Steel	Buna-N	1056T5	000000
	1"	6.56	1,500 psi @ 70° F	1	-30 to 275	4 5/8"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	Brass	316 Stainless Steel	Buna-N	1056T6	000000

316 Stainless Steel Body—Spring-Loaded Piston


Yor Lok Female Inlet × Yor Lok Female Outlet	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
Yor-Lok Female Inlet × Yor-Lok Female Outlet



	—	1/8"	0.1	3,000 psi @ 70° F	0.33	-10 to 375	2 1/4"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	45385K53	0000000


	—	1/4"	0.47	3,000 psi @ 70° F	0.33	-10 to 375	2 3/8"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	45385K54	00000
	—	3/8"	1.47	2,300 psi @ 70° F	0.33	-10 to 375	2 1/2"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	45385K55	000000
	—	1/2"	1.68	2,200 psi @ 70° F	0.33	-10 to 375	3"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	45385K56	000000
	—	3/4"	4.48	1,900 psi @ 70° F	0.33	-10 to 375	3 1/2"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	45385K59	000000
	—	1"	4.48	1,500 psi @ 70° F	0.33	-10 to 375	4 3/4"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	45385K58	000000
	—	6 mm	0.47	3,000 psi @ 70° F	0.33	-10 to 375	2 3/8"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	45385K41	000000
	—	10 mm	1.68	3,000 psi @ 70° F	0.33	-10 to 375	2 1/2"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	45385K43	000000
	—	12 mm	1.68	3,000 psi @ 70° F	0.33	-10 to 375	3 1/16"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	45385K44	000000


	NPT Male Inlet × Yor-Lok Female Outlet



			1/4	1/4"	0.47	3,000 psi @ 70° F	0.33	-10 to 375	2 1/8"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	45385K45	000000


			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	000000
			1/2	1/2"	1.68	3,000 psi @ 70° F	0.33	-10 to 375	2 7/8"	Any Angle, Horizontal, Vertical	Air, Argon, Helium, Krypton, Neon, Water, Xenon	316 Stainless Steel	302 Stainless Steel	Fluoroelastomer	45385K47	000000