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
Check-All Valve manufactures check valves, stainless check valves, sanitary check valves, connector check valves and flange check valves. We specialize in precision-type check valves. We recognize that the customer is important, and we will continue to serve each customer to the highest standards. Let our specially trained staff help you choose the proper combination for your application needs.
 
The Lee Company
Westbrook, CT
860-399-6281
For over 60 years, The Lee Company has been manufacturing high quality miniature check valves for use in aerospace hydraulic systems, oil tools, medical and scientific instrumentation and other industries worldwide. Our selection of check valves includes zero leak check valves, side exit check valves, check valves for installation into plastic and metal, pilot operated check valves & more.
 
Snap-tite Quick Disconnect & Valve Div.
Erie, PA
814-860-5700
Snap-tite offers over 70 years of experience in the manufacture quick disconnect couplings, check valves, hydraulic valves, vessels, fittings and other industrial components. Our strength is in providing expert solutions matched to the needs of the customer. From quick disconnects and relief valves to autoclaves, Snap-tite delivers the right high quality product, right on time, at the right price.
 
Pneumadyne, Inc.
Plymouth, MN
763-559-0177
Pneumadyne, Inc. is an ISO 9001:2008 certified manufacturer of pneumatic components and pneumatic control systems. Our Check Valves feature a variety of port sizes including 1/16 tube id barbs, 10-32 and 1/8 NPT threads and ¼ push-in connections to fit plumbing requirements. Pilot Operated Check Valves are also available to reliably hold an actuator position in a variety of applications.
 
Delta Pacific Valve Mfg. Co.
Hauppauge, NY
631-231-1261
Delta Pacific Valve is a manufacturer of API cast steel gate, check, globe and ball valves. Our valves are manufactured to industry and international standards, or to our customers' specific requirements. DPV® valves comply with environmental standards and meet ISO 9000 standards. We are Delta Pacific, we are Delta Terrific! Call today!
 
Plast-O-Matic Valves, Inc.
Cedar Grove, NJ
973-256-3000
Offering a full line of flow control products, Plast-O-Matic Valves ensures high quality by testing each of our valve products individually before shipment. We offer plastic check valves, PVC check valves, relief valves, ball check valves and more. We are committed to engineering excellence.
 
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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.