90° Elbow Vents | McMaster-Carr

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About Pressure-Relief Valves

Standard Duct and Fittings

No need for clamps or connectors—duct and fittings have a male end that is slightly smaller than its female end for simple assembly.

Brass and Bronze Steam Traps

These steam traps offer good corrosion resistance.

Pressure-Relief Valves

Pressure-Relief Valves for Water

These valves are commonly used with pumps in low-pressure water systems.

Precision-Adjustment Pressure-Relief Valves for Water

Change set pressure without guesswork—the adjustment screw is marked in 25 psi increments for making pressure adjustments without a gauge.

Adjustable Pressure-Relief Valves for Water

Alter the set pressure to suit your application.

Adjustable Pressure-Relief Valves for Fuel

To gradually relieve pressure in lines for diesel fuel, fuel oil, gasoline, and kerosene, these valves begin opening at the set pressure and fully open at about 10% over the set pressure.

Precision-Adjustment Pressure-Relief Valves for Fuel

A finely threaded adjustment screw lets you make precise set pressure adjustments.

Made-to-Order Pressure-Relief Valves

Design a valve specifically for your process media and set pressure. Choose from a valve for air, inert gas, water, hydraulic oil, fuel oil, gasoline, or diesel fuel and a set pressure.

Adjustable Pressure-Relief Valves for Chemicals

These valves are often used with catalysts, pH buffers, and electroplating solutions.

Pressure-Relief Valves for Oil

These valves are often used in hydraulic and lubrication systems.

Fast-Acting Pressure-Relief Valves

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

The most basic option for air and inert gas applications.

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

Body is brass or nickel-plated brass. All meet ASME Code Section VIII for use with air and inert gas pressure vessels.

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

For corrosion resistance in wet conditions and harsh environments, these valves have a 303 stainless steel body. All meet ASME Code Section VIII for use with air and inert gas pressure vessels.

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

Change set pressure to suit your application—this valve includes four interchangeable color-coded springs with different set pressure ranges.

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

With a 316 stainless steel body for exceptional corrosion resistance, these valves are often used in wet conditions and harsh environments. All meet ASME Code Section VIII for use with air and inert gas pressure vessels.

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

Commonly used with high-volume blowers, compressors, and air-powered conveyors, these valves quickly relieve a large amount of air in systems with a pipe size of 2 or greater.

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

These valves have a bronze body for durability and a long service life. All meet ASME Code Section VIII for use with air and inert gas pressure vessels.

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

Commonly used with high-volume blowers, compressors, and air-powered conveyors, these valves quickly relieve a large amount of air in systems with a pipe size of 2 or greater. All meet ASME Code Section VIII for use with air and inert gas pressure vessels.

Fast-Acting Pressure-Relief
Valves for Cryogenic Liquids

Use these valves with liquid argon, liquid nitrogen, and liquid oxygen.

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. They are for use with argon, carbon dioxide, helium, hydrogen, methane, nitrogen, and oxygen.

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

Choose these valves for small steam-heating boilers requiring pressure relief between 5 psi and 12 psi.

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

These valves meet ASME Code Section I for use with steam power boilers requiring pressure relief above 15 psi.

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

For use with low-pressure steam-heating boilers requiring pressure relief at 15 psi, these valves meet ASME Code Section IV.

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

These valves meet ASME Code Section VIII for use with water pressure vessels.

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

Protect your water-heating system with these valves that meet ASME Code Section IV for hot water heaters and boilers.

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

Also known as T & P valves, these open when water temperature reaches 210° F or at the set pressure.

About Pressure-Relief Valves

Standard Duct and Fittings

Standard Duct and Fittings

Brass and Bronze Steam Traps

Brass and Bronze Steam Traps

Pressure-Relief Valves

Pressure-Relief Valves for Water

Precision-Adjustment Pressure-Relief Valves for Water

Adjustable Pressure-Relief Valves for Water

Adjustable Pressure-Relief Valves for Fuel

Precision-Adjustment Pressure-Relief Valves for Fuel

Made-to-Order Pressure-Relief Valves

Adjustable Pressure-Relief Valves for Chemicals

Pressure-Relief Valves for Oil

Fast-Acting Pressure-Relief Valves

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

ASME-Code Fast-Acting Pressure-ReliefValves for Air and Inert Gas

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

Adjustable Fast-Acting Pressure-ReliefValves for Air and Inert Gas

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

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

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

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

Fast-Acting Pressure-ReliefValves for Cryogenic Liquids

ASME-Code Fast-Acting Pressure-ReliefValves for Cryogenic Fluids

Fast-Acting Pressure-Relief Valvesfor Ultra-Low-Pressure Steam

ASME-Code Fast-ActingPressure-Relief Valves for Steam

ASME-Code Fast-Acting Pressure-ReliefValves for Low-Pressure Steam

ASME-Code Fast-ActingPressure-Relief Valves for Water

ASME-Code Fast-ActingPressure-Relief Valves for Hot Water

Fast-Acting Temperature- andPressure-Relief Valves for Hot Water

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

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

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

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

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

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

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

Fast-Acting Pressure-Relief
Valves for Cryogenic Liquids

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

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

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

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

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

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

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