Flange Check Valve

Flange Check Valve

What is check valve?

A check valve, clack valve, non-return valve, reflux valve, retention valve or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.

Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, or inexpensive. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. The bodies (external shells) of most check valves are made of plastic or metal.

Types of Check Valve

ball check valve

ball check valve is a check valve in which the closing member, the movable part to block the flow, is a ball. In some ball check valves, the ball is spring-loaded to help keep it shut. For those designs without a spring, reverse flow is required to move the ball toward the seat and create a seal. The interior surface of the main seats of ball check valves are more or less conically-tapered to guide the ball into the seat and form a positive seal when stopping reverse flow.

Wafer check valves

Wafer check valves have a solid thermoplastic body with a very thin "wafer" profile that makes them an ideal check valve for applications that require valves with short takeout lengths. Wafer check valves are used in applications where it is essential to ensure fluid flow passes in only one direction.

diaphragm check valve

A diaphragm check valve uses a flexing rubber diaphragm positioned to create a normally-closed valve. Pressure on the upstream side must be greater than the pressure on the downstream side by a certain amount, known as the pressure differential, for the check valve to open allowing flow. Once positive pressure stops, the diaphragm automatically flexes back to its original closed position.

swing check valve

A swing check valve or tilting disc check valve is a check valve in which the disc, the movable part to block the flow, swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow.

stop-check valve

stop-check valve is a check valve with override control to stop flow regardless of flow direction or pressure. In addition to closing in response to backflow or insufficient forward pressure (normal check-valve behavior), it can also be deliberately shut by an external mechanism, thereby preventing any flow regardless of forward pressure.

lift-check valve is a check valve in which the disc, sometimes called a lift, can be lifted up off its seat by higher pressure of inlet or upstream fluid to allow flow to the outlet or downstream side. A guide keeps motion of the disc on a vertical line, so the valve can later reseat properly. When the pressure is no longer higher, gravity or higher downstream pressure will cause the disc to lower onto its seat, shutting the valve to stop reverse flow.

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Hebei Huahui Valve Co.,Ltd (Botou Yaxing Fluid Equipment Co.,ltd) was established in 2003, specialize in designing and manufacturing various kinds of high quality valves and accessories, such as: Gate valve, Butterfly valve, Check valve, Strainer, Hudraulic control valve(float valve, pressure reducing valve, pressure relief valve,flow control valve),HVAC balancing valve,Air release valve,Rubber flexible joint and Stainless steel flexible joint,Pipe fittings(unicersal coupling, flange adaptor, repair clamp, saddle...) etc, which used in water supply and sewage system fire fighting system, and heating ventilation air conditioning system.

Hebei Huahui Valve Co.,Ltd is located in Botou Industrial Zone,Cangzhou City Hebei Province China.Our workshop occupying 150000 square meters, our manufacturing process include machining, shot blasting ,epoxy powder coating,assembling, testing, packing, which is the whole process of valve production from foundry to finished Products. Welcome old and new customers visit our factory and develop business with us.

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