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Double Check Valve Manufacturers and Suppliers

IQS Directory provides a detailed list of double check valve manufacturers and suppliers. Find double check valve companies that can design, engineer, and manufacture double check valves to your specifications. Peruse our website to review and discover top double check valve manufacturers with roll over ads and complete product descriptions. Connect with the double check 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 double door check valve tapped check valve double, spring loaded double check valves of every type, IQS is the premier source for you.

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Our double 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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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

Double Check Valves

A double check valve, sometimes called a double check assembly (DCA), is a type of check valve used to protect water supplies from contamination due to backflow. They are also commonly used in air brake systems on heavy trucks. Other places double check valves are found include lawn irrigation, fire sprinkler and combi-boiler systems.

Generally known as a relief valve, double check valves have fairly simple mechanics since their effectiveness is determined by the process flow, which means no other device is needed. They are usually attached to the pump head on the inlet and outlet lines of various types of fluid pipes in pumps and systems.  The body of the valve holds in place a ring-like element known as the seat, which extends from the inner walls toward the center-line of the pipe but does not fully close. A plugging mechanism, such as a piston or ball rests in the seat. Another plugging device is a swinging disk. When pressure is great enough and going in the desired direction, the stopper is lifted away from the seat, opening the gap to allow the process stream to flow freely. The reverse flow then pushes the plug back into the hole, creating an air tight seal that will not be opened again until forward flow pressure is greater than the back pressure. Since check valves allow the stream to flow in only one direction, the system stays clean. Specifically, double check valves consist of two spring check valves assembled in sequence, usually with a ball valve or gate valve at each end.


Double check valves have multiple valves working together for a few reasons. First, one check valve is still able to act even if the other is jammed open. Also, a more reliable seal is possible when one valve is closed, because this reduces the pressure differential across the other and stops leakage of any kind. Size varies among double check valves, as it does among all check valves. Small valves may be so compact they are not noticeable, particularly when they are integrated into the bodies of existing taps (faucets). Larger check valves may be installed with ball valves at the ends, which are partly there to test the double check valve periodically. This valve system mainly deals with keeping water clean and therefore requires consistent evaluation abilities for proper function. One industry utilizing double check valves is water treatment companies, but others use it often too.

Double Check Valves
Double Check Valves
Double Check Valves - Check-All Valve Manufacturing Company
Double Check Valves - Check-All Valve Manufacturing Company






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