Relief Valves | McMaster-Carr

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System of Measurement

Inlet Pipe Size

Set Pressure

For Use With

Pipe Size

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

Outlet Pressure

Body Material

Inlet Thread Type

Airflow Capacity

Set Pressure Configuration

Seal Material

Relief Port Pipe Size

Maximum Pressure

1,000 psi to 1,999 psi

2,000 psi to 2,999 psi

3,000 psi to 3,999 psi

Thread Type

UN/UNF (SAE Straight)

Shape

Material

Burst Pressure

Maximum Temperature

Valve Type

Back-Pressure Regulator

Inlet Connection

RoHS

Compliant with Exemptions

Not Compliant

REACH

Compliant

Not Compliant

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

Yes

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

800 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

20 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

Adjustable Inline Pressure-Relief Valves for Chemicals

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

3 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

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

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

305 products

Air-Exhaust Valves

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

104 products

Pressure-Relief Discs

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

39 products

Vacuum-Regulating Valves

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

14 products

Safety Lockout Valves

Prevent accidental start-up when servicing equipment

57 products

Air Admittance Valves

Allow air into drain, waste, and vent systems so you don't have to vent plumbing to the outdoors

2 products

Pipe Plugs

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

6 products