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Relief Valves

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They relieve excess pressure from equipment failure, process upset, or fire by opening an auxiliary passage to divert the fluid (liquid, gas, steam or air) away from the pressure vessel. Once the pressure in the vessel is released and the danger is over the relief valve closes itself. Read More…

Relief Valves A relief valve is a type of valve used to control or limit the pressure in a system. Also known as pressure relief valves (PRV), pressure safety valves (PSV) and safety valves, these systems act as a safety measure.
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Leading Manufacturers

W. Des Moines,IA  |  515-224-2301

Our check valves are manufactured with the customer in mind. We believe in offering superior products and services every time. No matter whether you are looking for small or large valves, we can meet your every needs. It is our goal to offer excellent prices and service to each customer. Contact us to learn more today!

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Check-All Valve Manufacturing Company $$$

Hartsville, SC  |  800-476-9876

ABCO Anderson Brass Company is a family-owned business started in 1931. We produce the Kantleak™ line of valves, including brass ball valves, 3 way ball valves and actuated valves. We also offer needle valves, selector valves, manifold valves, plug and drain valves and other specialty valves.

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Anderson Brass Company $$$

Enfield, CT  |  860-749-0761

Conval manufactures Clampseal™ severe service Y-, angle and T-pattern forged globe stop, check and stop check valves. Available in over 12,000 configurations, in 1/2" through 4" sizes for ASME pressure classes to 4500#. In-line serviceability and interchangeable parts are key features.

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Conval, Inc. $$$

Cincinnati, OH  |  513-852-2000

Powell has been manufacturing quality products since 1846. We offer a line of high temperature, high pressure forged steel valves including wafer check valves. These valves are ideal when dealing with limited space and come in sizes ½” – 4” and are available in threaded or flanged.

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Powell Valves $$$
placeholder image Check-All Valve Manufacturing Company Anderson Brass Company Conval, Inc. Powell Valves

Emergency situations are not the only times relief valves are active; once installed they continuously regulate the flow of substance. They can also be pre-set to open when the pressure or temperature gets to a certain point that may be dangerous. Generally valves are placed on or near the pump head of the hose, pipe or tube. A wide variety of relief valve designs exist, although most resemble ball-check valves, swing check valves or diaphragm valves.

This last is particularly useful when controlling a flow of fluids that contains suspended solids. Most relief valves are spring operated, as are the majority of check valves. One specialized type of relief valve is known as a vacuum relief valve. As opposed to a normal relief valve, which relieves high pressure, a vacuum relief valve is used to relieve dangerously low pressures, or vacuums, by inserting air or an inert gas.

Like every other type of check valve, relief valves may be constructed from a variety of materials, including PVC, brass, ductile iron, copper, polyethylene, polypropylene, aluminum, steel, stainless steel and rubber. Which raw substance is used to produce each relief valve depends on the environment said relief valve will be in. The wrong product could result in erosion or contamination of the process stream. However, as long as research is done, finding the appropriate type of relief valve is possible. Every plumbing or fluid transfer application in the industrial, commercial and domestic arenas employ or will employ check valves. In fact, check valves of all kinds are an essential part of every day life. Because they need not be supervised to function and prevent product malfunction, check valves are not only desirable but often required by law to ensure the safety of water, gas and pressure applications.

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