1/4 Check Valves | McMaster-Carr

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126 Products

About Backflow-Prevention Valves

Threaded Check Valves

For use with threaded pipe, these valves are available with NPT, NPTF, BSPP, BSPT, and UNI/UNF (JIC) connections.

Compact Threaded Check Valves

With a shorter end-to-end length than other check valves, these fit in tight spaces.

High-Flow Threaded Check Valves

To achieve the maximum possible flow, internal components are designed to reduce flow resistance.

Plastic Threaded Check Valves

Plastic provides a lightweight alternative to metal.

Compact Plastic Threaded Check Valves

At 1 1/2" long or less, these valves fit in confined spaces.

High-Pressure Threaded Check Valves

Rated for up to twice the pressure of standard check valves, these can withstand pressures up to 3,000 psi.

High-Temperature Threaded Check Valves

The heat-resistant rubber seal withstands temperatures up to 500° F.

Check Valves with Barbed Fittings

Barbs grip onto tubing, providing a secure hold.

Heavy Duty Check Valves with Barbed Fittings

For more durability than plastic barbed check valves, these have a stainless steel body.

Check Valves with Yor-Lok Fittings

Two sleeves give the fittings extra gripping power. They bite into tubing as you tighten the nut to form a strong seal. All are compatible with Swagelok®, Let-Lok, and Parker A-Lok fittings.

Check Valves with Push-to-Connect Fittings

Insert tubing into the fitting—no heat, solder, or flux required.

Socket-Connect Check Valves

Weld to unthreaded metal pipe.

Threaded Check Valves for Harsh Chemicals

These valves open to allow flow in one direction and close when flow stops or reverses.

Ultra-Chemical-Resistant Threaded Check Valves

The most chemical-resistant check valves in our offering, these have a PFA body to withstand methyl ethyl ketone, sodium hypochlorite, and other extremely harsh chemicals.

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

Insert tubing into the fittings—no heat, solder, or flux required.

Heavy Duty Threaded Check
Valves for Drinking Water

For more durability than plastic, these valves have a metal body.

Threaded Check Valves for Oil and Fuel

Plastic Threaded Check Valves for Oil and Fuel

Plastic provides a lightweight alternative to metal.

High-Temperature Threaded
Check Valves for Oil and Fuel

For more than twice the temperature rating of standard check valves for oil and fuel, these have a heat-resistant fluoroelastomer seal that can withstand temperatures up to 500° F.

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, these are often used in hydraulic applications with pressures up to 3,000 psi.

Threaded Check Valves for Vacuum

Valves have NPT connections for use with threaded pipe.

Check Valves for Steam

To withstand high pressures and temperatures in steam service applications, these valves have a 316 stainless steel body, PTFE ball, and PTFE seal.

Vacuum-Breaking Valves

Commonly used with irrigation systems and laboratory equipment, these valves have NPT connections.

Pipeline Flame Arresters

To prevent flashback in flammable gas pipelines, an internal flame-arresting element absorbs the heat from a fire to extinguish the flame.

Backflow-Prevention Inline Hydraulic Valves

Also known as check valves, these open to allow flow in one direction and close when flow stops or reverses.

Oxyacetylene Welding and Cutting

Welding Gas Check Valves for Regulators

Stop the reverse flow of gas in your regulator.

Welding Gas Flashback Arresters for Regulators

Attach these arresters to the outlet connection of a regulator on a torch that cuts steel up to 11" thick.

About Backflow-Prevention Valves

Check Valves

Threaded Check Valves

Compact Threaded Check Valves

High-Flow Threaded Check Valves

Plastic Threaded Check Valves

Compact Plastic Threaded Check Valves

High-Pressure Threaded Check Valves

High-Temperature Threaded Check Valves

Check Valves with Barbed Fittings

Heavy Duty Check Valves with Barbed Fittings

Check Valves with Yor-Lok Fittings

Check Valves with Push-to-Connect Fittings

Socket-Connect Check Valves

Threaded Check Valves for Harsh Chemicals

Ultra-Chemical-Resistant Threaded Check Valves

Check Valves with Push-to-ConnectFittings for Harsh Chemicals

Heavy Duty Threaded CheckValves for Drinking Water

Threaded Check Valves for Oil and Fuel

Plastic Threaded Check Valves for Oil and Fuel

High-Temperature ThreadedCheck Valves for Oil and Fuel

High-Pressure ThreadedCheck Valves for Oil and Fuel

Threaded Check Valves for Vacuum

Check Valves for Steam

Vacuum-Breaking Valves

Vacuum-Breaking Valves

Pipeline Flame Arresters

Pipeline Flame Arresters

Backflow-Prevention Inline Hydraulic Valves

Backflow-Prevention Inline Hydraulic Valves

Oxyacetylene Welding and Cutting

Welding Gas Check Valves for Regulators

Welding Gas Flashback Arresters for Regulators

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

Heavy Duty Threaded Check
Valves for Drinking Water

High-Temperature Threaded
Check Valves for Oil and Fuel

High-Pressure Threaded
Check Valves for Oil and Fuel