The basic actuator is used to drive the valve to a fully open or fully closed position. The actuator used to control the valve can precisely move the valve to any position. Although most actuators are used for switching valves, the design of actuators nowadays goes far beyond simple switching functions. They include position induction devices, moment induction devices, electrode protection devices, logic control devices, digital communication modules and PID control modules, all of which are installed. Inside a compact shell.

Because more and more factories adopt automatic control and manual operation is replaced by machinery or automation equipment, people require the actuator to play an interface role between the control system and the mechanical movement of valves, and also require the actuator to enhance the performance of work safety and environmental protection. In some dangerous situations, automated actuator devices can reduce personnel injury.

Some special valves require emergency opening or closing under special circumstances. Valve actuators can prevent further spread of hazards while minimizing plant losses. For some high pressure and large caliber valves, the required actuator output torque is very large. At this time, the required actuator must improve mechanical efficiency and use high output motor, so as to operate large caliber valves smoothly. For some small torque valves, small and fine electric valves are also used. Compared with ordinary valves, they have the advantages of light weight, compact structure and complete functions.