Metal Check Valves | McMaster-Carr

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675 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.

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.

High-Cycling Threaded Check Valves

With few moving parts to wear out, these valves withstand frequent opening and closing, pulsating flow, and rapid flow reversal.

Heavy Duty Check Valves with Barbed Fittings

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

Flange-Mount Check Valves

Sandwich these valves between two ANSI flanges for backflow prevention at a fraction of the weight of flanged check valves and a reduced pipeline footprint.

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 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.

Flanged Check Valves

Bolt to ANSI flanges.

Check Valves with Solder-Connect Fittings

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

Butt-Weld Check Valves

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

Union-Insert Check Valves

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

Heavy Duty Threaded Check
Valves for Drinking Water

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

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

The metal body is more durable than plastic.

Flange-Mount Check Valves for Drinking Water

Sandwich these valves between ANSI flanges.

Check Valves with Solder-Connect
Fittings for Drinking Water

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

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.

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.

Flange-Mount Check Valves for Oil and Fuel

Install these valves between ANSI flanges.

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 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 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 Refrigerant

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

Two-Stage Backflow-Prevention Valves

Threaded Two-Stage Backflow-Prevention Valves

Attach these valves with NPT connections to threaded pipe.

Two-Stage Backflow-Prevention
Valves with Solder-Connect Fittings

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

Threaded Two-Stage Backflow-Prevention
Valves for Drinking Water

Easy-Maintenance Threaded Two-Stage
Backflow-Prevention Valves for Drinking Water

Integral shutoff valves isolate flow for inline maintenance, and a top-entry cover provides easy access to internal components.

Vacuum-Breaking Valves

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

High-Pressure Vacuum-Breaking Valves

Rated for 12 times the pressure of standard vacuum-breaking valves, these can handle up to 1,500 psi. Connections are NPT.

Vacuum-Breaking Valves with Garden-Hose Fittings

Prevent dirty, contaminated water from backing up into your garden hose line—install these valves between a faucet and a garden hose.

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.

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

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.

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.

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.

Oxyacetylene Welding and Cutting

Welding Gas Check Valves for Regulators

Stop the reverse flow of gas in your regulator.

Welding Gas Check Valves for Torches

Stop the reverse flow of gas in your torch.

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.

Welding Gas Flashback Arresters for Torches

These arresters attach directly to torches that cut steel up to 8" thick.

Frostproof Vacuum-Breaking Valves with Garden Hose Threads

Frostproof Vacuum-Breaking
Valves with Garden Hose Threads

Stop backward flow in outdoor faucets with garden hose thread (GHT) outlets.

Arresters for Flammable Vapors

Minimize fire hazard from flammable vapors. Mount arresters on your vent pipe to stop flames from traveling back to your tank.