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Solenoid valve is an industrial equipment controlled by electromagnetism. It is an automatic basic element used to control fluid. It belongs to actuator and is not limited to hydraulic and pneumatic. It is used in industrial control system to adjust the direction, flow, speed and other parameters of medium. The solenoid valve can cooperate with different circuits to achieve the expected control, and the control accuracy and flexibility can be guaranteed. There are many kinds of solenoid valves. Different solenoid valves play different roles in different positions of the control system. The most commonly used are one-way valves, safety valves, directional control valves, speed control valves, etc.