Gravity Check Valves | McMaster-Carr

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169 Products

About Backflow-Prevention Valves

Plastic Socket-Connect Check Valves

Also known as backwater valves, these valves prevent backflow of sewage and wastewater in drain, waste, and vent systems.

Socket-Connect Check Valves

Weld to unthreaded metal pipe.

High-Flow Threaded Check Valves

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

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.

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.

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.

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.

Threaded Check Valves for Drinking Water

Body is plastic.

Flange-Mount Check Valves for Drinking Water

Sandwich these valves between ANSI flanges.

Check Valves with Barbed Fittings for Vacuum

Barbs grip onto tubing, providing a secure hold.

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.

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.

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.

About Backflow-Prevention Valves

Check Valves

Plastic Socket-Connect Check Valves

Socket-Connect Check Valves

High-Flow Threaded Check Valves

High-Cycling Threaded Check Valves

Flange-Mount Check Valves

Flanged Check Valves

Check Valves with Solder-Connect Fittings

Socket-Connect Check Valves for Drinking Water

Threaded Check Valves for Drinking Water

Flange-Mount Check Valves for Drinking Water

Check Valves with Barbed Fittings for Vacuum

Flange-Mount Check Valves for Oil and Fuel

Socket-Connect Check Valves for Oil and Fuel

High-Performance Threaded Check Valves for Fuel

Two-Stage Backflow-Prevention Valves

Threaded Two-Stage Backflow-Prevention Valves

Two-Stage Backflow-PreventionValves with Solder-Connect Fittings

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