Brass Check Valves | McMaster-Carr

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379 Products

Check Valves

Threaded Check Valves

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

79 products

High-Flow Threaded Check Valves

Internal components reduce flow resistance for the maximum possible flow

57 products

Flange-Mount Check Valves

Sandwich between two ANSI flanges for backflow prevention that adds little weight or space

Check Valves with Yor-Lok Fittings

Two sleeves give the fittings extra gripping power

6 products

Check Valves with Push-to-Connect Fittings

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

5 products

High-Temperature Threaded Check Valves

The rubber seal withstands temperatures up to 500° F

20 products

High-Cycling Threaded Check Valves

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

12 products

High-Pressure Threaded Check Valves

Rated for up to twice the pressure of standard check valves

12 products

Compact Threaded Check Valves

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

9 products

Check Valves with Solder-Socket Fittings

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

7 products

Check Valves for Oil and Fuel

Threaded Check Valves for Oil and Fuel

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

18 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

Check Valves for Drinking Water

Heavy Duty Threaded Check Valves for Drinking Water

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

11 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

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

2 products

Other Products

Air Flow Check Valves

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

9 products

Backflow-Prevention Valves

Dual checks stop flow from reversing and contaminating your system

26 products

Hydraulic Check Valves

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

18 products

Vacuum Breakers

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

20 products

Welding Gas Flashback Arresters

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

24 products