Check Valves/

Non Return Valve

Non return valves are another name for check valves, or valves that regulate the directionality of gas or liquid process streams. Also known as one-way directional valves, these devices are employed in virtually every industrial, commercial and even domestic application that involves the unidirectional flow of materials. Water treatment, sewage, agricultural, indoor plumbing, medical, chemical processing, food processing, power generation and petrochemical facilities are all among those who utilize non return valves in their daily operations.

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Check-All Valve Manufacturing Company
W. Des Moines, IA
515-224-2301
Since its inception in 1958, Check-All has expanded from producing one valve with one material to manufacturing a series of valves in a wide range of materials. Many companies manufacture check valves in addition to other product lines; however, Check-All is dedicated solely to the design and manufacture of spring loaded check valves. Turn to Check-All for superior non-return valves.
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The Lee Company
Westbrook, CT
860-399-6281
Founded in 1948, The Lee Company now has over 700,000 sq. ft. of modern manufacturing and office space at four sites in Westbrook and Essex, Connecticut, and employs over 800 people. Lee maintains an international sales force of graduate engineers ready to assist you in solving your fluid flow problems. Please contact Lee for your next purchase of quality non return valves.
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Primary Fluid Systems Inc.
Burlington, ON
800-776-6580
Primary Fluid Systems has been in business since 1991, as a supplier of precision made non return valves in addition to many other similar products & specialty components for manufacturing industries. Primary has supplied many high-quality solutions for various applications, serving a wide range of major industries. Please contact Primary today with any questions you may have.
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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.
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Pneumadyne, Inc.
Plymouth, MN
763-559-0177
Pneumadyne, Inc. is a leading ISO 9001:2008 certified manufacturer of pneumatic components and pneumatic control systems. Designed and manufactured in the USA, Pneumadyne's non return valves, fittings, manifolds, air nozzles and custom products are relied upon throughout a wide-variety of industries. Please contact Pneumadyne today with any questions you may have.
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Industry Information

Non Return Valve

Mixers, metering pumps, faucets, tankers and boilers rely on the backflow prevention provided by non-return valves to prevent flooding, cross-contamination and upstream surges such as water hammers. Both the equipment and the processes themselves are protected by non return valves that are easily integrated into pre-existing pipelines. Valve operation is entirely reliant on the pressure flow of process streams and therefore requires no external activation or actuation. The cylindrical device is simply put in place and left to mediate the process flow. While several different types of non return valves, such as ball check valves and wafer check valves, are widely available, the overall process is similar. An oversized stopper or plug rests in the seat of the valve. The seat is a cross-sectional element that extends from the walls of the cylinder but has an opening suitable to passing the process stream. When fluid or gas flows at the optimal pressure or higher, it pushes the stopper out and away from the seat, creating a gap through which the stream may pass. When downstream pressure drops and the material begins to flow the other way, the plug is quickly pressed back into place, creating a tight seal that prevents backwash.

As non return valves are extremely versatile, they must be made compatible with a number of different process streams. Corrosive, acidic, basic, abrasive and even hazardous materials are commonly found flowing through these check valves, as are gentler materials such as water, oxygen and detergent. It is important that the material construction of the valve be compatible with the process stream. Insufficient materials can wear or erode quickly causing the mechanical failure of the valve or even contamination of the downstream liquids or gases. To accommodate their many uses, valves are made of a wide range of metals, including brass, bronze, copper, stainless steel, iron and aluminum. Plastic check valves, commonly made from PVC, polypropylene, rubber and polyethylene, are also popular. In addition to material concerns, the overall size and diameter of the valve should be considered so that it fits into the piping while allowing the stream to pass as needed. Other considerations include media temperature and the valve flow coefficient. While each of these is important, the pressure rating or cracking pressure of the valve is the primary concern. This is the minimum pressure at which the valve will operate, or open. If the valve is too large or bulky, the pressure created by the process stream will not be able to open it, even if the opposing pressure is exceeded. An undersized check valve will fail to close. Both miscalculations can result in wasted material, damaged equipment and/or cross-contamination.