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Double Check Valves

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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. Read More…

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.
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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 $$$

Exeter, NH  |  603-418-2800

ASC Engineered Solutions is a leading manufacturer of check valves. Our expert team works side by side with our customers to ensure high quality and that our products fit their needs. For more information about our check valves, visit our website or give us a call today!

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ASC Engineered Solutions $$$

Monroe, CT  |  800-533-3285

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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O'Keefe Controls Co. $$$

Solon, OH  |  440-248-4600

Swagelok is a leader in the development and manufacturing of high-quality valve products. We offer a broad line of adjustable and fixed cracking pressure check valves to control back flow in general-service and high-purity applications. Our associates are singularly focused on how they can improve our customers’ experience through innovative products and services.

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Swagelok Company $$$
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Sanitary Cartridge Check Valves Double Check Valves - Check-All Valve Manufacturing Company

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 Informational Video

 
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