Can the cylinder not use solenoid valve?

With adjustment, without solenoid valve, the valve opening can be adjusted by positioner. The cut-off valve needs to be controlled by solenoid valve.

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