There is a closed cavity in the solenoid valve, with through holes at different positions. Each hole is connected to a different oil pipe. There is a piston in the middle of the cavity and two electromagnets on both sides. The valve body will be attracted to the side where the magnet coil is energized. The different oil drain holes are opened or closed by controlling the movement of the valve body. The oil inlet hole is always open, and the hydraulic oil will enter different oil drain pipes. Then the piston of the oil cylinder is pushed by the pressure of the oil, and the piston drives the piston rod, which drives the mechanical device. In this way, the mechanical movement is controlled by controlling the on and off of the current of the electromagnet.
