The overall size of the valve is equivalent to that of an ordinary check valve, consisting of a main valve and external accessories. Among them, the main valve includes valve body, pressure plate and diaphragm, large valve plate, slow closing valve plate, valve seat, valve stem assembly and other components. The valve stem assembly of the slow closing valve plate is connected with the pressure plate and the diaphragm. The diaphragm is compressed between the valve cover and the diaphragm seat, and the up and down movement of the diaphragm drives the slow closing valve plate up and down. The valve stem passes through the central hole of the large valve plate, so the large valve plate can slide along the valve stem within a certain range. Usually, the large valve plate is pressed against the valve seat under its own weight, so that the valve is in a closed state. The external accessories of the multifunctional water pump control valve are installed on both sides of the valve diaphragm and the inlet and outlet pipes of the valve. The lower cavity of the diaphragm and the connecting pipe on the inlet side of the valve are equipped with a control valve, a filter and a special check valve.
Only a filter and a control valve are provided on the connecting pipe between the upper cavity of the diaphragm and the water outlet side of the valve. The movement and position of the large valve plate and the slow-closing valve plate in the main valve determine the change of the valve working state and the opening and closing. The external accessories and pipelines of the valve transmit the pressure changes before and after the valve to the upper cavity and the lower cavity divided by the diaphragm at any time, control the movement of the large valve plate and the slow closing valve plate, and can change the large valve plate and the valve plate by adjusting the accessories. The operating speed of the slow-closing valve plate keeps the opening and slow-closing time of the valve within the specified range