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 Valve manufactures check valves, stainless check valves, sanitary check valves, connector check valves and flange check valves. We specialize in precision-type check valves. We recognize that the customer is important, and we will continue to serve each customer to the highest standards. Let our specially trained staff help you choose the proper combination for your application needs.
 
The Lee Company
Westbrook, CT
860-399-6281
For over 60 years, The Lee Company has been manufacturing high quality miniature check valves for use in aerospace hydraulic systems, oil tools, medical and scientific instrumentation and other industries worldwide. Our selection of check valves includes zero leak check valves, side exit check valves, check valves for installation into plastic and metal, pilot operated check valves & more.
 
Snap-tite Quick Disconnect & Valve Div.
Erie, PA
814-860-5700
Snap-tite offers over 70 years of experience in the manufacture quick disconnect couplings, check valves, hydraulic valves, vessels, fittings and other industrial components. Our strength is in providing expert solutions matched to the needs of the customer. From quick disconnects and relief valves to autoclaves, Snap-tite delivers the right high quality product, right on time, at the right price.
 
Pneumadyne, Inc.
Plymouth, MN
763-559-0177
Pneumadyne, Inc. is an ISO 9001:2008 certified manufacturer of pneumatic components and pneumatic control systems. Our Check Valves feature a variety of port sizes including 1/16 tube id barbs, 10-32 and 1/8 NPT threads and ¼ push-in connections to fit plumbing requirements. Pilot Operated Check Valves are also available to reliably hold an actuator position in a variety of applications.
 
Delta Pacific Valve Mfg. Co.
Hauppauge, NY
631-231-1261
Delta Pacific Valve is a manufacturer of API cast steel gate, check, globe and ball valves. Our valves are manufactured to industry and international standards, or to our customers' specific requirements. DPV® valves comply with environmental standards and meet ISO 9000 standards. We are Delta Pacific, we are Delta Terrific! Call today!
 
Plast-O-Matic Valves, Inc.
Cedar Grove, NJ
973-256-3000
Offering a full line of flow control products, Plast-O-Matic Valves ensures high quality by testing each of our valve products individually before shipment. We offer plastic check valves, PVC check valves, relief valves, ball check valves and more. We are committed to engineering excellence.
 
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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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