Security Valves | McMaster-Carr

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1,776 Products

Pressure-Relief Valves

Fast-Acting Pressure-Relief Valves

ASME-Code Fast-Acting Pressure-Relief Valves for Air and Inert Gas

Meet ASME Code Section VIII for use with air and inert gas pressure vessels

24 products

ASME-Code Fast-Acting Pressure-Relief Valves for Steam

Install in steam power boilers requiring pressure relief above 15 psi

13 products

Remote-Discharge ASME-Code Fast-Acting Pressure-Relief Valves for Air and Inert Gas

Direct discharge away from your work environment through the relief port

31 products

Corrosion-Resistant ASME-Code Fast-Acting Pressure-Relief Valves for Air and Inert Gas

Stainless steel body to resist corrosion in wet conditions and harsh environments

2 products

Fast-Acting Pressure-Relief Valves for Air and Inert Gas

The most basic option for air and inert gas applications

12 products

ASME-Code Fast-Acting Pressure-Relief Valves for Water

Meet ASME Code Section VIII for use with water pressure vessels

4 products

Fast-Acting Pressure-Relief Valves for Cryogenic Liquids

Withstand the extreme cold of liquid argon, nitrogen, and oxygen

1 product

ASME-Code Fast-Acting Pressure-Relief Valves for Cryogenic Fluids

Our only valves that meet ASME Code Section VIII for use with cryogenic pressure vessels

2 products

ASME-Code Fast-Acting Pressure-Relief Valves for Hot Water

Meet ASME Code Section IV for hot water heaters and boilers

7 products

Fast-Acting Temperature- and Pressure-Relief Valves for Hot Water

Open when water temperature reaches 210°F or the set pressure

11 products

ASME-Code Fast-Acting Pressure-Relief Valves for Low-Pressure Steam

Place in low-pressure steam-heating boilers requiring pressure relief at 15 psi

8 products

Large-Diameter Remote-Discharge ASME-Code Fast-Acting Pressure-Relief Valves for Air and Inert Gas

Relieve a large amount of air and meet ASME Code Section VIII

3 products

Large-Diameter Remote-Discharge Fast-Acting Pressure-Relief Valves for Air and Inert Gas

Relieve a large amount of air in systems with a pipe size of 2 or greater

3 products

Fast-Acting Pressure-Relief Valves for Ultra-Low-Pressure Steam

Install in steam-heating boilers requiring pressure relief between 5 and 12 psi

3 products

Corrosion-Resistant Remote-Discharge ASME-Code Fast-Acting Pressure-Relief Valves for Air and Inert Gas

Resist corrosion and direct discharge away from your work environment

3 products

Adjustable Fast-Acting Pressure-Relief Valves for Air and Inert Gas

Change set pressure using four interchangeable springs with different set pressure ranges

1 product

Pressure-Relief Valves

Pressure-Relief Valves for Oil

Often used in hydraulic and lubrication systems

5 products

Pressure-Relief Valves for Cryogenic Applications

Withstand the extreme cold of liquid argon, nitrogen, and oxygen

7 products

Precision-Adjustment Pressure-Relief Valves for Fuel

The adjustment screw has fine threads for precise set pressure adjustments

7 products

Compact Pressure-Relief Valves

Install on tanks in low-clearance areas

20 products

Pressure-Relief Valves for Water

Install in pumps attached to low-pressure water systems

5 products

Made-to-Order Pressure-Relief Valves

Design a valve specifically for your process media and set pressure

6 products

Adjustable Pressure-Relief Valves for Water

Alter the set pressure to suit your application

22 products

Adjustable Pressure-Relief Valves for Fuel

Gradually relieve pressure in lines for diesel fuel, fuel oil, gasoline, and kerosene

7 products

Pressure-Relief Valves with Push-to-Connect Fittings for Air

Push-to-connect fittings create a low-pressure seal around plastic and soft metal tubing

4 products

Adjustable Pressure-Relief Valves for Chemicals

Resist chemicals in applications with catalysts, pH buffers, and more

5 products

Precision-Adjustment Pressure-Relief Valves for Water

Adjust without a gauge by using the 25 psi increments marked on the screw

4 products

Adjustable Inline Pressure-Relief Valves for Chemicals

Install inline and often used with feed pumps for fertilizers and bleach

3 products

Hydraulic Valves

Hydraulic Pressure-Relief Valves

To set the pressure, unscrew the cap and turn the adjusting screw

8 products

Easy-Adjust Hydraulic Pressure-Relief Valves

An external nut lets you adjust the pressure without disassembling the valve

5 products

Tamper-Resistant Hydraulic Pressure-Relief Valves

Require a hex key to unlock the locknut and adjust the pressure

1 product

Screw-In Hydraulic Pressure-Relief Valves

Set a specific pressure and these valves will maintain it

6 products

Block-Mount Hydraulic Pressure-Relief Valves

Maintain a set pressure by diverting excess fluid from a pump to a tank

2 products

Other Products

Pressure-Regulating Valves

Reduce inlet pressure to a lower outlet pressure to protect sensitive equipment

20 products

Safety Lockout Valves

Prevent accidental start-up when servicing equipment

57 products

Manual On-Off Valves

Start and stop flow through a line

746 products

Air Flow Control Valves

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

17 products

Directional Control Valves

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

8 products

Flow-Adjustment Valves

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

233 products

Mixing Valves

Blend hot and cold water, steam, or oil to maintain a set outlet temperature and prevent scalding

277 products

Compressed Air Regulators

Ensure continuous, safe operation of air-powered equipment by controlling air pressure

6 products

Hydraulic On-Off Valves

Control the flow in high-pressure hydraulic systems

15 products

Compressed Air Regulator Locks

Lock over your regulator knob to prevent unwanted pressure changes

6 products

Flame Arresters

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

6 products

Garden Hose Faucets

Connect garden hose to lines coming from a building or the ground

6 products