Power station check valves can be divided into three types according to the structure: lift check valves, swing check valves and butterfly check valves. Lift check valve can be divided into vertical and horizontal two. Swing check valve is divided into single-valve, double-valve and multi-valve type. Butterfly check valve is straight-through type, the above types of check valves in the form of connection can be divided into threaded, flanged and welded three.

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