Check valve
Applicable standards:
Design per ANSI B16.34&API 6D or BS1868
Test per API 598
Face to face dimensions per ASME 16.10
Butt-welding ends per ASME B 16.25
A check valve is a mechanical device, 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, many check valves are very small, simple, and/or cheap. 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.
An important concept in check valves is the cracking pressure which is the minimum upstream pressure at which the valve will operate. Typically the check valve is designed for and can therefore be specified for a specific cracking pressure.
Heart valves are essentially inlet and outlet check valves for the heart ventricles, since the ventricles act as a pump.
Shanghai Shenyin Group which included Shanghai Shenyin valve Co., Ltd(valve products), Shanghai Shenyin Pump Industrial Mfg. Co., Ltd(heat pumps, centrifugal pumps, pump accessories and electric control cabinets and etc) and Wenzhou Shenyin Explosion-proof Motors Co., Ltd( for motor products and also reducer).
And we Shanghai SHENYIN VALVE Co., Ltd. is a hi-tech valve manufacturer integrating research, development, production, sales and service. The main products have gate valve, check valve, globe valve, ball valve, butterfly valve and so on, the standard according to GB, API, DIN, BS & JIS.
Competitive price, good quality products and short deliver time is our advantages.
Our factory is honored "strictly abiding by contracts and having a good standing" enterprise every year. Our trademark "shenyin" was registered in national trademark bureau, registration number is 1017120. Please recognize our trademark, beware of imitations. Patent no.: (00216191.5, 00216753.0). We may affix the responsibility for counterfeit.
