By controlling the electric current off solenoid controlled the mechanical movement

Solenoid valve solenoid valve has closed chamber, in different locations with holes, each hole connecting different tubing, middle piston chamber, both sides are two electromagnets, which faces the magnet coil is energized, the valve body will be attracted to which side, the movement of the control valve to open or close the drain hole different, and into the hole is always open, the hydraulic oil will enter a  electric meter  pipe, and the oil pressure to push the piston of the cylinder, and drive the piston rod, the piston rod drive mechanism. So that the electrical current through the control solenoid on-off control of the mechanical motion. Is  circuit breakers  controlled industrial equipment, is used to control the flow of  Voltage stabilizer , belong to the actuator, not limited to hydraulic, pneumatic. Used in industrial control system to adjust the direction of the medium, flow, speed and other parameters. Solenoid valve can be used with different circuit to achieve the desired control, and control to ensure the accuracy and flexibility. There are many solenoid valve, the solenoid valve in the control of different systems play a role in different locations, the most commonly used one-way valve, safety valve, the directional control valve, the speed control valve.