Check valve is to rely on the flow of the medium itself automatically open and close the valve, backflow valve to prevent the media, also known as check valve, Dan Xiangfa, the reflux valve and the back pressure valve. Check valve is an automatic valve, the main role is to prevent the media back, to prevent reverse pump and drive motor, and discharge the container medium. Check valve can also be used for the pipe to the pressure may rise to assist system exceeds the system pressure supply on. Check valve can be divided into swing check valve (according to the focus of rotation) and lift check valves (along the axis of movement).
Check valve is the role of this type of valve is only allowing media to flow in one direction, and stop the flow in the opposite direction. This valve is usually the work automatically, fluid pressure flow in one direction, the valve flap to open; the opposite direction of fluid flow, fluid pressure and valve by the self weight of the overlap effect on the valve seat, thereby cutting off flow.
Non return valve which belongs to this type of valve, which includes swing check valves and lift check valves. Swing check valves are ordinary hinge, there is a door the same as the valve seat tilt freely against the surface. In order to ensure that every time the valve seat surface to reach the appropriate position, the valve flap design in the hinge so that the valve flap is enough to swing space, and the valve genuine and comprehensive contact with the valve seat. Valve could be made of metal, can also be in the metal inlaid leather, rubber, or synthetic coverage, depending on the requirements of the use of performance. Swing check valve in the fully open position, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. Lift type check
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