1/2 Check Valves | McMaster-Carr

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126 Products

Check Valves

Threaded Check Valves

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

21 products

High-Flow Threaded Check Valves

Internal components reduce flow resistance for the maximum possible flow

7 products

Compact Plastic Threaded Check Valves

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

4 products

Plastic Threaded Check Valves

Plastic provides a lightweight alternative to metal

1 product

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

Check Valves with Barbed Fittings

Barbs grip onto tubing, providing a secure hold

7 products

Socket-Connect Check Valves

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

1 product

High-Cycling Threaded Check Valves

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

2 products

Compact Flange-Mount Check Valves

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

1 product

Butt-Weld Check Valves

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

1 product

Check Valves with Push-to-Connect Fittings

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

5 products

High-Temperature Threaded Check Valves

The rubber seal withstands temperatures up to 500° F

2 products

Union-Insert Check Valves

Reduce installation time and allow for maintenance without detaching pipe connections

2 products

Clear-View Socket-Connect Check Valves

Inspect flow and debris accumulation through the transparent valve body

1 product

Heavy Duty Check Valves with Barbed Fittings

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

2 products

Check Valves for Harsh Chemicals

Easy-Install Threaded Check Valves for Harsh Chemicals

Reduce installation time and allow for maintenance without detaching pipe connections

4 products

Threaded Check Valves for Harsh Chemicals

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

1 product

Ultra-Chemical-Resistant Threaded Check Valves

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

1 product

Socket-Connect Check Valves for Harsh Chemicals

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

2 products

Clear-View Socket-Connect Check Valves for Harsh Chemicals

Inspect flow and debris accumulation through the transparent valve body

1 product

Check Valves for Oil and Fuel

High-Performance Threaded Check Valves for Fuel

Withstand pressures up to 1,975 psi and temperatures up to 800° F

2 products

Threaded Check Valves for Oil and Fuel

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

4 products

Plastic Threaded Check Valves for Oil and Fuel

Plastic provides a lightweight alternative to metal

1 product

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

High-Temperature Threaded Check Valves for Oil and Fuel

A fluoroelastomer seal withstands temperatures up to 500° F

1 product

Check Valves for Drinking Water

Threaded Check Valves for Drinking Water

Meet NSF/ANSI 61 requirements for drinking water service

3 products

Socket-Connect Check Valves for Drinking Water

Bond to unthreaded pipe with primer and cement for a permanent, leak-tight connection

3 products

Heavy Duty Threaded Check Valves for Drinking Water

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

1 product

Check Valves for Vacuum

Threaded Check Valves for Vacuum

Prevent vacuum loss with these airtight, leakproof valves

1 product

Check Valves for Steam

Withstand the high pressures and temperatures in steam service applications

2 products

Other Products

Backflow-Prevention Valves

Dual checks stop flow from reversing and contaminating your system

7 products

Air Flow Check Valves

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

3 products

Hydraulic Check Valves

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

12 products

Vacuum Breakers

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

9 products

Flame Arresters

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

1 product