Check Valves/

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. 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.

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Check-All Valve Manufacturing Company
W. Des Moines, IA
515-224-2301
Check-All has become an internationally recognized company for quality, innovation, and cost efficiency. Check-All recognizes that the customer is #1 and will continue to build its foundation for success on SERVICE TO EACH CUSTOMER. Along with its many standard / space saving designs, Check-All can design and manufacture its relief valves for almost any application.
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The Lee Company
Westbrook, CT
860-399-6281
The Lee Company is a leading supplier of relief valves and more to a wide range of industries including aerospace, formula 1 racing, oil exploration, automotive and off-highway equipment and medical/scientific instruments. Lee Co.'s products are recognized worldwide for superior quality, reliability and performance. Please call Lee today or browse through their website for more information.
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Primary Fluid Systems Inc.
Burlington, ON
800-776-6580
Primary Fluid Systems recognizes the need for specialty components not readily available or price competitive on the market to help make equipment more efficient. For more than twenty years Primary has been manufacturing high-quality relief valves designed to enhance the accuracy and safety of customers' technology. Please visit Primary`s website for full descriptions of superior services.
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Parker/Snap-tite
Erie, PA
814-860-5700
Snap-tite joins the Parker family to create one of the world's strongest brands of Quick Connect Couplings. We produce hydraulic & pneumatic couplings in a variety of sizes, materials, and end configurations to accommodate a broad spectrum of design requirements. In addition to Quick Couplings, our product offering includes Hydraulic Swivels, Check Valves, & state-of-the-art Diagnostic Equipment.
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Pneumadyne, Inc.
Plymouth, MN
763-559-0177
Pneumadyne, Inc, an ISO 9001:2008 certified manufacturer of pneumatic components, was founded in 1975. Over the years, Pneumadyne has grown from a manufacturer of precision detailed components to a designer and manufacturer of entire system solutions. Providing high-quality relief valves that solve problems and exceed customer expectations continues to be Pneumadyne's goal.
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Relief 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.

Relief Valve
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