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Relief Valve Manufacturers and Suppliers

IQS Directory provides a detailed list of relief valve manufacturers and suppliers. Find relief valve companies that can design, engineer, and manufacture relief valves to your specifications. Peruse our website to review and discover top relief valve manufacturers with roll over ads and complete product descriptions. Connect with the relief valve companies through our hassle-free and efficient request for quote form. You are provided company profiles, website links, locations, phone numbers, product videos, and product information. Read reviews and stay informed with product new articles. Whether you are looking for manufacturers of pressure relief valve tankless water heater, fuel pressure relief valve, steam boiler relief valves of every type, IQS is the premier source for you.

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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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Nothing works without us! That is exactly why you should contact the Flowtech Division of UNIBLOC® Pump, Inc. We manufacture quality butterfly and check valves for pharmaceutical, food/beverage and chemical industries. Our other products include pressure relief valves, in-line sightglass, strainers and more. Give us a call today for your stainless steel pumps and valves!
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We carry a full range of check valve products, ranging from innovative ball check valve designs to simple plastic check valves. Our goal is to offer superior products and services that last as long as our customers. We take the time to manufacture our products with you in mind. If you would like to learn more, give us a call today or visit our website!
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Since 1951, we have been a global leader in the distribution of over 3,000 types of quick release couplings used in agriculture. However, we also recognize that check valves are used in hydraulic circuits for safety purposes. Visit our website to see our line of check valves used in agricultural, road, forestry and earth moving machines. ISO 9000:2000 certified.
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Dragon Valves has been manufacturing check valves since 1945. Instrumentation, manifold and specialty valves are our focus and the aerospace, chemical, diving and ship building industries rely on us. Our extensive catalog contains a large range of valve types including air operated, bar stock, cartridge, forged body, high pressure, needle, remote controlled, severe service, steam and still more.
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Apollo Valves is a manufacturer of flow control valves including check valves, stainless check valves, ball check valves and relief valves. While some see valve manufacturing as a mature industry, Apollo sees continuous opportunities for innovation and better customer service.
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Industry Information

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.

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 Valves
Relief Valves
Relief Valves - Primary Fluid Systems Inc.
Relief Valves - Primary Fluid Systems Inc.






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