FXB Water-tank Pipe-net Pressure-overlapped

When the equipment is put into movement, the water in one-path from the tap-water pipe-net flows into the water tank, with the water therein controlled by a floating ball valve and an electric valve, and then the pump inlet via the incoming water changeover apparatus; while the one in the other path directly flows into the pump inlet. When the water supply capacity of the pipe-net can meet with the demand of use, the pressure of it is kept within the normal water supply range, the negative-pressure preventing module controlled electric valve is opened and the pump moves to carry out the pressure overlapped water supply; while the said capacity can not meet with the demand, the pipe-net pressure is lower than that for normal water supply, the said module automatically adjusts the opening of the electric valve till its being closed, at this time water supply by the water tank is automatically switched in.