Check Valves for Air | McMaster-Carr

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573 Products

Check Valves

Threaded Check Valves

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

119 products

High-Flow Threaded Check Valves

Internal components reduce flow resistance for the maximum possible flow

67 products

Check Valves with Barbed Fittings

Barbs grip onto tubing, providing a secure hold

71 products

Check Valves with Yor-Lok Fittings

Two sleeves give the fittings extra gripping power

18 products

Flange-Mount Check Valves

Sandwich between two ANSI flanges for backflow prevention that adds little weight or space

8 products

Check Valves with Push-to-Connect Fittings

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

High-Pressure Threaded Check Valves

Rated for up to twice the pressure of standard check valves

18 products

Compact Flange-Mount Check Valves

Less than half the length of other flange-mount check valves for limited-clearance pipelines

8 products

High-Temperature Threaded Check Valves

The rubber seal withstands temperatures up to 500° F

28 products

Plastic Threaded Check Valves

Plastic provides a lightweight alternative to metal

10 products

Compact Threaded Check Valves

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

18 products

High-Cycling Check Valves

Resist wear from frequent operation so they can cycle as often as once per second

32 products

Compact Plastic Threaded Check Valves

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

5 products

Heavy Duty Check Valves with Barbed Fittings

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

15 products

High-Cycling Threaded Check Valves

Few moving parts to wear out from frequent opening, pulsating flow, and rapid reversal

12 products

Clear-View Socket-Connect Check Valves

Inspect flow and debris accumulation through the transparent valve body

6 products

Check Valves with Luer Lock Fittings

Consist of a plug and a socket so you can easily connect and disconnect your line with a half turn

4 products

Butt-Weld Check Valves

Weld to unthreaded pipe for a smooth, flush connection that provides maximum flow

5 products

Union-Insert Check Valves

Reduce installation time and allow for maintenance without detaching pipe connections

8 products

Check Valves for Harsh Chemicals

Threaded Check Valves for Harsh Chemicals

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

10 products

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

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

1 product

Check Valves with Barbed Fittings for Harsh Chemicals

Barbs grip onto tubing, providing a secure hold

7 products

Easy-Install Threaded Check Valves for Harsh Chemicals

Reduce installation time and allow for maintenance without detaching pipe connections

5 products

Check Valves for Vacuum

Threaded Check Valves for Vacuum

Prevent vacuum loss with these airtight, leakproof valves

5 products

Check Valves with Barbed Fittings for Vacuum

Barbs grip onto tubing, providing a secure hold

2 products

Other Products

Backflow-Prevention Valves

Dual checks stop flow from reversing and contaminating your system

5 products

Vacuum Breakers

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

16 products