The bottom valve belongs to the automatic valve of the check valve. It is a low-pressure flat valve. Its function is to ensure the one-way flow of the liquid in the suction pipe, so that the pump can work normally. When the pump stops working intermittently, the liquid cannot return to the water source box, ensuring that the liquid cannot be returned to the water source box. The suction pipe is filled with liquid to facilitate the restart of the pump, improve efficiency, and reduce energy loss and protect the pump.
