Check valve is to rely on the media itself and automatically open the valve, closed valve, used to prevent the media back to the valve, also known as check valve, counter valve and back pressure valve. Check valve is an automatic valve, its main role is to prevent the media back to prevent the pump and drive the motor reversal, and the container media discharge. The check valve can also be used to provide piping where the pressure may rise above the supply of the system pressure. Check valve can be divided into swivel check valve (according to the center of gravity rotation) and lift check valve (along the axis of movement).
Check Valve this type of valve serves only to allow the media to flow in one direction and to prevent the opposite direction from flowing. Usually the valve is automatically working, in a direction of the flow of fluid pressure, the valve flap open; fluid flow in the opposite direction, by the fluid pressure and the valve flap from the valve seat in the valve seat, thus cutting the flow. In the nominal pressure PN1.0MPa ~ 42.0MPa, Class150 ~ 25000; nominal diameter DN15 ~ 1200mm, NPS1 / 2 ~ 48; operating temperature -196 ~ 540 ℃ on a variety of pipelines, used to prevent the media back flow. Through the use of different materials, can be applied to water, steam, oil, nitric acid, acetic acid, strong oxidizing medium and uric acid and other media.
Check valve classification
① Butterfly double check valve is mainly used in high-rise building water supply pipeline, containing corrosive media and sewage in the use of fluid pipe network.
② Lift mute check valve is used in the water supply and drainage engineering quality requirements of the pipeline; at the same time can be installed at the pump outlet, the required pressure (PN2.5Mpa) relatively high pipe network; is a good waterproof hammer check valve product.
③ Lifting muffler check valve for high-rise building water supply and drainage system and the pump at the exit, not suitable for sewage pipe occasions.
④ Horizontal check valve for diving, drainage, sewage pump, especially for sewage and sludge systems.
⑤ Swing rubber check valve used in urban water pipe network system; not suitable for sediment and more sewage pipes.
⑥ Swivel single check valve with a wide range of use, can be installed in the water supply and drainage, petroleum, chemical, metallurgical, industrial and other pipelines, space restrictions on the most appropriate occasions.