1/4 Check Valves | McMaster-Carr

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Air Flow Check Valves

Check Valves

Flame Arresters

Hydraulic Check Valves

Vacuum Breakers

Welding Gas Flashback Arresters

System of Measurement

Pipe Size

Thread Type

Body Material

For Use With

Fitting Connection

Minimum Opening Pressure

Maximum Pressure @ Temperature

Material

Gender

Fitting Type

Connects To

Shape

Tube OD

Seal Material

Actuation

Spring Material

Piston Material

Check Valve Type

Valve Type

Mounting Position

RoHS

Compliant with Exemptions

Not Compliant

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

Yes

REACH

Compliant

Not Compliant

Export Control Classification Number (ECCN)

2B999

EAR99

DFARS Specialty Metals

Exempt

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127 Products

Check Valves

Threaded Check Valves

Open to allow flow in one direction and close when flow stops or reverses

16 products

Check Valves with Barbed Fittings

Barbs grip onto tubing, providing a secure hold

17 products

Compact Threaded Check Valves

A shorter end-to-end length than other check valves to fit in tight spaces

8 products

High-Pressure Threaded Check Valves

Rated for up to twice the pressure of standard check valves

5 products

Check Valves with Yor-Lok Fittings

Two sleeves give the fittings extra gripping power

1 product

High-Flow Threaded Check Valves

Internal components reduce flow resistance for the maximum possible flow

7 products

Plastic Threaded Check Valves

Plastic provides a lightweight alternative to metal

4 products

Check Valves with Push-to-Connect Fittings

Insert tubing into the fitting without needing heat, solder, or flux

15 products

Compact Plastic Threaded Check Valves

1 1/2" long or less so they fit in confined spaces

1 product

Socket-Connect Check Valves

Insert unthreaded pipe into the socket ends and weld to create a permanent, leak-tight connection

1 product

Heavy Duty Check Valves with Barbed Fittings

A stainless steel body makes these more durable than plastic barbed check valves

2 products

High-Temperature Threaded Check Valves

The rubber seal withstands temperatures up to 500° F

2 products

Check Valves for Harsh Chemicals

Check Valves with Push-to-Connect Fittings for Harsh Chemicals

Insert tubing into the fitting without needing heat, solder, or flux

1 product

Ultra-Chemical-Resistant Threaded Check Valves

A PFA body withstands methyl ethyl ketone, sodium hypochlorite, and other harsh chemicals

4 products

Threaded Check Valves for Harsh Chemicals

Open to allow flow in one direction and close when flow stops or reverses

2 products

Check Valves for Vacuum

Threaded Check Valves for Vacuum

Prevent vacuum loss with these airtight, leakproof valves

1 product

Check Valves for Oil and Fuel

Threaded Check Valves for Oil and Fuel

Open to allow flow in one direction and close when flow stops or reverses

4 products

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

4 products

Plastic Threaded Check Valves for Oil and Fuel

Plastic provides a lightweight alternative to metal

7 products

High-Temperature Threaded Check Valves for Oil and Fuel

A fluoroelastomer seal withstands temperatures up to 500° F

1 product

Welding Gas Check Valves

Welding Gas Check Valves for Regulators

Stop the reverse flow of gas in your regulator

2 products

Check Valves for Steam

Withstand the high pressures and temperatures in steam service applications

2 products

Check Valves for Drinking Water

Heavy Duty Threaded Check Valves for Drinking Water

The metal body makes these more durable than plastic valves for drinking water

1 product

Other Products

Air Flow Check Valves

Open to allow air flow in one direction and close when flow stops or reverses

1 product

Hydraulic Check Valves

Open to allow hydraulic fluid flow in one direction and close when flow stops or reverses

14 products

Vacuum Breakers

When pressure drops, vents open to prevent suction from drawing liquid back upstream

1 product

Flame Arresters

Absorb heat from a fire in your gas pipeline to stop it from traveling back to the gas source

1 product

Welding Gas Flashback Arresters

Attach to your gas welder to extinguish flames and stop reverse gas flow

2 products