Spring Check Valves | McMaster-Carr

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664 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.

High-Temperature Threaded Check Valves

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

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.

Compact Flange-Mount Check Valves

Less than half the end-to-end length of standard flange-mount check valves, these can be installed in pipelines with limited clearance.

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.

Union-Insert Check Valves

To reduce installation time and allow for maintenance without detaching pipe connections, these valves insert into a union fitting.

Check Valves with Push-to-Connect Fittings

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

Butt-Weld Check Valves

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

Check Valves for Drinking Water

Threaded Check Valves for Drinking Water

Body is plastic.

Heavy Duty Threaded Check
Valves for Drinking Water

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

Socket-Connect Check Valves for Drinking Water

Insert unthreaded pipe into the socket ends and bond with primer and cement to create a permanent, leak-tight connection.

Flange-Mount Check Valves for Drinking Water

Sandwich these valves between ANSI flanges.

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

Valves have a plastic body.

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

The metal body is more durable than plastic.

Check Valves with Solder-Connect
Fittings for Drinking Water

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

Check Valves for Harsh Chemicals

Socket-Connect Check Valves for Harsh Chemicals

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.

Check Valves with Barbed
Fittings for Harsh Chemicals

Barbs grip onto tubing, providing a secure hold.

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.

Check Valves for Oil and Fuel

Threaded Check Valves for Oil and Fuel

High-Performance Threaded Check Valves for Fuel

These heavy duty valves can withstand pressures up to 1,975 psi and temperatures up to 800° F.

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.

Plastic Threaded Check Valves for Oil and Fuel

Plastic provides a lightweight alternative to metal.

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.

Socket-Connect Check Valves for Oil and Fuel

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

Check Valves for Food and Beverage

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

To maintain sanitary standards in food, beverage, and dairy applications, these valves have sanitary quick-clamp connections and polished internal surfaces for easy cleaning.

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

These compact valves fit into standard sanitary quick-clamp fittings. All are FDA Compliant 21 CFR 177.2600 and have polished surfaces for easy cleaning.

Threaded Check Valves for Vacuum

Valves have NPT connections for use with threaded pipe.

Check Valves for Refrigerant

These valves are often used in refrigeration and air-conditioning systems.

Vacuum-Breaking Valves for Chemicals

A plastic body withstands pH neutralizing, cleaning, and plating solutions containing sodium hydroxide, methyl ethyl ketone, and other harsh chemicals.

Electric-, Air-, and Hydraulic-Powered Motion Control

Backflow-Prevention Screw-In Hydraulic Valves

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

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.

Air Flow Check Valves

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

Air Compressor Air Flow Check Valves

Prevent air from escaping an air storage tank when the air compressor is not running. These valves open to allow flow into the tank and close when flow stops or reverses direction.