butterfly check valve is opened and closed automatically according to the flow of the medium itself disc, to prevent the backflow medium valve, also known as far, valve, check valve, flow valve and the back pressure valve. Check valve is a kind of automatic valve. Its main function is to prevent the backflow medium, inversion of the pump and drive motor, and release the container medium. Check valve can also be used for pipeline for auxiliary system provides the pressure of the pressure may be higher than the system pressure. Check valve can be divided into swing check valve ( According to the center of gravity rotating) And lift check valve ( Move along the axis) 。

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