Working principle of water spray valve in rear cylinder

There is a closed cavity in the valve, and there are through holes in different positions. Each hole is connected with a different oil pipe. There is a piston in the middle of the cavity and two electromagnets on both sides. When the electromagnetic coil on which side is energized, the valve body will be attracted to which side. By controlling the movement of the valve body, different oil discharge holes will be opened or closed, while the oil inlet hole is always open. Hydraulic oil will enter different oil discharge pipes, and then the piston of the oil cylinder will be driven by the oil pressure. The piston will drive the piston rod, which will drive the mechanical device.