Metal Relief Valves | McMaster-Carr

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For Use With

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Maximum Inlet Pressure

Less than 500 psi

500 psi to 999 psi

1,000 psi to 1,999 psi

2,000 psi to 3,999 psi

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Relief Port Pipe Size

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1,000 psi to 1,999 psi

2,000 psi to 2,999 psi

3,000 psi to 3,999 psi

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UN/UNF (SAE Straight)

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Back-Pressure Regulator

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Yes

DFARS Specialty Metals

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734 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

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

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 Steam

Install in steam power boilers requiring pressure relief above 15 psi

13 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

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 Water

Meet ASME Code Section VIII for use with water pressure vessels

4 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

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

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

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 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

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

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

Pressure-Relief Valves

Compact Pressure-Relief Valves

Install on tanks in low-clearance areas

18 products

Pressure-Relief Valves for Cryogenic Applications

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

7 products

Adjustable Pressure-Relief Valves for Water

Alter the set pressure to suit your application

22 products

Made-to-Order Pressure-Relief Valves

Design a valve specifically for your process media and set pressure

6 products

Precision-Adjustment Pressure-Relief Valves for Fuel

The adjustment screw has fine threads for precise set pressure adjustments

7 products

Pressure-Relief Valves for Water

Install in pumps attached to low-pressure water systems

5 products

Adjustable Pressure-Relief Valves for Fuel

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

7 products

Precision-Adjustment Pressure-Relief Valves for Water

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

4 products

Pressure-Relief Valves for Oil

Often used in hydraulic and lubrication systems

5 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

Screw-In Hydraulic Pressure-Relief Valves

Set a specific pressure and these valves will maintain it

6 products

Tamper-Resistant Hydraulic Pressure-Relief Valves

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

1 product

Other Products

Pressure-Regulating Valves

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

286 products

Air-Exhaust Valves

Vent or divert exhaust to speed up the operation of air cylinders, actuators, and other equipment

88 products

Pressure-Relief Discs

Rupture at a set pressure or temperature to vent fluid and gas and protect machinery; one-time use

27 products

Vacuum-Regulating Valves

Control the amount of air that a vacuum pump draws from your system to maintain vacuum levels

12 products

Safety Lockout Valves

Prevent accidental start-up when servicing equipment

57 products

Pipe Plugs

Insert into the ends of pipe to keep out dirt and debris

6 products