Valve Checks | McMaster-Carr

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Air Flow Check Valves

Air Flow Control Valves

Air Valves

Air-Actuated On/Off Valves

Backflow-Prevention Valves

Check Valves

Compressed Gas Valves

Coolant Hose and Fittings

Directional Control Valves

Drain Check Valves

Flame Arresters

Flow-Adjustment Valves

Hose Fittings

Hydraulic Check Valves

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UN/UNF (SAE Straight)

UNF

UNJ/UNJF (SAE Straight)

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Shape

Adjustable-Angle Elbow

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Maximum Pressure @ Temperature

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Inlet Thread Type

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Compliant with Exemptions

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

DFARS Specialty Metals

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1,893 Products

Fluid Handling

Check Valves

Permit flow in only one direction by closing when flow stops or reverses

802 products

Backflow-Prevention Valves

Dual checks stop flow from reversing and contaminating your system

26 products

Valve Repair Kits

Maintain valves with replacement parts such as seals, plungers, and springs

160 products

Flow-Adjustment Valves

Gradually open and close to control the volume of air and liquids through a line

6 products

Air Valves

Fill tanks, tires, and other pressurized equipment

23 products

Vacuum Breakers

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

33 products

Directional Control Valves

Manage the flow of fluids to move equipment in air- and hydraulic-powered systems

1 product

Air-Actuated On/Off Valves

Operate on compressed air to start and stop flow faster than motor-driven valves

3 products

Sump Pump Backflow-Prevention Valves

Block dirty water from returning to your sump pump

2 products

Hose Fittings

Create threaded, barbed, quick-disconnect, and other types of connections between lengths of hose

15 products

Flame Arresters

Absorb heat from a fire in your gas pipeline to stop it from traveling back to the gas source

8 products

Injection Valves

Pump liquid into your process line or tank while preventing backflow

3 products

Compressed Gas Valves

Check and adjust the pressure of compressed gas in tanks; also known as Schrader valves

2 products

Pump Repair Kits

Keep your diaphragm, circulation, and metering pumps in working order

68 products

Power Transmission

Air Flow Control Valves

Control the speed of air-powered equipment by adjusting the volume of airflow entering or exiting

293 products

Air Flow Check Valves

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

21 products

Hydraulic Check Valves

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

78 products

Raw Materials

Rubber

Compresses and bounces back to shape; often used for sealing, cushioning, and shock absorbing

100 products

Plastic

A lightweight alternative to metal and glass

27 products

Stainless Steel

Resists corrosion and chemicals in most environments—all with material certificates for traceability

160 products

Fastening and Joining

Welding Gas Flashback Arresters

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

24 products

Facility and Grounds Maintenance

Drain Check Valves

Prevent water damage by placing into floor drains to stop sewer back-ups

3 products

Lubricating

Coolant Hose and Fittings

Build a custom system to deliver coolant, cutting oil, water, or air in any direction

25 products