Check Valves/

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.

Request for Quote
Check-All Valve Manufacturing Company
W. Des Moines, IA
515-224-2301
Check-All Valve manufactures double check valves, stainless check valves, sanitary check valves, connector check valves & flange check valves, in addition to much more. Check-All recognizes that the customer is important, and it will continue to serve each customer to the highest standards. Let Check-All's specially trained staff help you choose the proper combination for your application needs.
Request For Quote 
View Website
The Lee Company
Westbrook, CT
860-399-6281
The Lee Company has pioneered the development of precision fluid control components for aerospace, down-hole oil tools, machine tools, medical/scientific instrumentation & ink-jet printing since 1948. Lee`s unique capabilities in miniaturization & engineering expertise keep the company at the forefront of fluid flow technology. For quality double check valves, turn to The Lee Company.
Request For Quote 
View Website
Primary Fluid Systems Inc.
Burlington, ON
800-776-6580
As a leading manufacturer of quality double check valves since 1991, see what Primary Fluid Systems has to offer in all related products and services, available in PVC, PP, CPVC, TFE, PVDF, 316 S/S, Hastelloy C and Alloy 20, plus ACCU-VENT automatic degassing valves. View and purchase products from Primary's online catalog and see complete CAD drawings from its downloadable library.
Request For Quote 
View Website
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.
Request For Quote 
View Website
Pneumadyne, Inc.
Plymouth, MN
763-559-0177
Pneumadyne, Inc. is an ISO 9001:2008 certified manufacturer of pneumatic components & pneumatic control systems. Pneumadyne's double check valves feature a variety of port sizes including 1/16 tube id barbs, 10-32 & 1/8 NPT threads and ¼ push-in connections to fit plumbing requirements. Pilot operated solutions are also available to reliably hold an actuator position in a variety of applications.
Request For Quote 
View Website

Please Note: You may have disabled JavaScript and/or CSS. Although this news content will be accessible, certain functionality is unavailable.

Click a state to view Double Check Valves companies serving that area. Double Check Valves Companies in Ontario Double Check Valves Companies in Alabama Double Check Valves Companies in Arizona Double Check Valves Companies in Arkansas Double Check Valves Companies in California Double Check Valves Companies in Connecticut Double Check Valves Companies in Connecticut Double Check Valves Companies in Florida Double Check Valves Companies in Georgia Double Check Valves Companies in Illinois Double Check Valves Companies in Indiana Double Check Valves Companies in Iowa Double Check Valves Companies in Massachusetts Double Check Valves Companies in Massachusetts Double Check Valves Companies in Michigan Double Check Valves Companies in Michigan Double Check Valves Companies in Minnesota Double Check Valves Companies in Missouri Double Check Valves Companies in Nebraska Double Check Valves Companies in New Hampshire Double Check Valves Companies in New Hampshire Double Check Valves Companies in New Jersey Double Check Valves Companies in New Jersey Double Check Valves Companies in New York Double Check Valves Companies in New York Double Check Valves Companies in North Carolina Double Check Valves Companies in Ohio Double Check Valves Companies in Oklahoma Double Check Valves Companies in Pennsylvania Double Check Valves Companies in South Carolina Double Check Valves Companies in Texas Double Check Valves Companies in Virginia Double Check Valves Companies in Wisconsin Double Check Valves Companies in Map of United States
Industry Information

Double Check Valves

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.