Air Check Valves | McMaster-Carr

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594 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 Push-to-Connect Fittings

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

63 products

Flange-Mount Check Valves

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

8 products

Check Valves with Barbed Fittings

Barbs grip onto tubing, providing a secure hold

71 products

High-Cycling Check Valves

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

32 products

Compact Threaded Check Valves

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

18 products

Check Valves with Yor-Lok Fittings

Two sleeves give the fittings extra gripping power

18 products

High-Cycling Threaded Check Valves

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

12 products

Plastic Threaded Check Valves

Plastic provides a lightweight alternative to metal

10 products

Compact Plastic Threaded Check Valves

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

High-Temperature Threaded Check Valves

The rubber seal withstands temperatures up to 500° F

28 products

Heavy Duty Check Valves with Barbed Fittings

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

15 products

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

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

Clear-View Socket-Connect Check Valves

Inspect flow and debris accumulation through the transparent valve body

6 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 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

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

Threaded Check Valves for Harsh Chemicals

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

10 products

Easy-Install Threaded Check Valves for Harsh Chemicals

Reduce installation time and allow for maintenance without detaching pipe connections

5 products

Check Valves with Barbed Fittings for Harsh Chemicals

Barbs grip onto tubing, providing a secure hold

7 products

Other Products

Air Flow Check Valves

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

21 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