Check Valves | McMaster-Carr

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998 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

Socket-Connect Check Valves

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

10 products

Plastic Threaded Check Valves

Plastic provides a lightweight alternative to metal

10 products

High-Temperature Threaded Check Valves

The rubber seal withstands temperatures up to 500° F

28 products

Compact Threaded Check Valves

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

18 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 Check Valves

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

32 products

High-Cycling Threaded Check Valves

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

12 products

Plastic Socket-Connect Check Valves

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

9 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

Check Valves with Solder-Socket Fittings

Solder to copper tubing for a permanent, leak-tight connection

7 products

Union-Insert Check Valves

Reduce installation time and allow for maintenance without detaching pipe connections

8 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

19 products

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

Socket-Connect Check Valves for Harsh Chemicals

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

11 products

Check Valves with Barbed Fittings for Harsh Chemicals

Barbs grip onto tubing, providing a secure hold

7 products

Ultra-Chemical-Resistant Threaded Check Valves

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

5 products

Flanged Check Valves for Harsh Chemicals

Bolt to ANSI flanges

2 products

Clear-View Socket-Connect Check Valves for Harsh Chemicals

Inspect flow and debris accumulation through the transparent valve body

3 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 Food and Beverage

Check Valves with Sanitary Quick-Clamp Fittings for Food and Beverage

Maintain sanitary standards in food, beverage, and dairy applications

24 products

Insert Check Valves with Sanitary Quick-Clamp Fittings for Food and Beverage

Fit into standard sanitary quick-clamp fittings

5 products

Check Valves for Oil and Fuel

Flange-Mount Check Valves for Oil and Fuel

Install between ANSI flanges

6 products

Threaded Check Valves for Oil and Fuel

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

18 products

High-Performance Threaded Check Valves for Fuel

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

12 products

Plastic Threaded Check Valves for Oil and Fuel

Plastic provides a lightweight alternative to metal

13 products

High-Temperature Threaded Check Valves for Oil and Fuel

A fluoroelastomer seal withstands temperatures up to 500° F

6 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

12 products

Socket-Connect Check Valves for Oil and Fuel

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

6 products

Check Valves for Drinking Water

Threaded Check Valves for Drinking Water

Meet NSF/ANSI 61 requirements for drinking water service

17 products

Socket-Connect Check Valves for Drinking Water

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

18 products

Heavy Duty Threaded Check Valves for Drinking Water

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

11 products

Check Valves with Push-to-Connect Fittings for Drinking Water

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

8 products

Heavy Duty Check Valves with Push-to-Connect Fittings for Drinking Water

The metal body makes them more durable than plastic valves with push-to-connect fittings

5 products

Check Valves with Solder-Socket Fittings for Drinking Water

Solder to copper tubing for a permanent, leak-tight connection

4 products

Check Valves for Steam

Withstand the high pressures and temperatures in steam service applications

16 products

Welding Gas Check Valves

Welding Gas Check Valves for Regulators

Stop the reverse flow of gas in your regulator

2 products

Welding Gas Check Valves for Torches

Stop the reverse flow of gas in your torch

3 products

Check Valves for Refrigerant

Use in refrigeration and air-conditioning systems

4 products

Other Products

Air Flow Check Valves

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

21 products

Hydraulic Check Valves

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

78 products

Backflow-Prevention Valves

Dual checks stop flow from reversing and contaminating your system

26 products

Sump Pump Backflow-Prevention Valves

Block dirty water from returning to your sump pump

2 products

Vacuum Breakers

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

33 products

Drain Check Valves

Prevent water damage by placing into floor drains to stop sewer back-ups

3 products

Flame Arresters

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

8 products

Welding Gas Flashback Arresters

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

24 products