Check valve is to rely on the flow of the media itself and automatically open and close the valve flap, used to prevent the media back to the valve, also known as check valve, check valve, counterflow valve and back pressure valve. Check valve is an automatic valve, its main role is to prevent media backflow, to prevent the pump and drive motor reversal, and the release of container media. Check valves can also be used on lines where the pressure may rise above the system pressure auxiliary system to provide replenishment. Check valve can be divided into spin-check valve (according to the center of gravity rotation) and the lift check valve (along the axis of movement).
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