The actuator

The basic actuator is used to drive the valve to the fully open or fully closed position. The actuator used to control the valve can accurately move the valve to any position. Although most actuators are used to open and close valves, the design of today's actuators goes far beyond simple switching functions. They include position sensing devices, torque sensing devices, electrode protection devices, logic control devices, digital communication modules, and PID control modules, all of which are installed in a compact housing.
Due to the increasing adoption of automation control in factories, manual operations have been replaced by machinery or automation equipment. It is required that the actuator can serve as an interface between the control system and the mechanical movement of the valve, and enhance work safety and environmental protection performance. In some hazardous situations, automated actuator devices can reduce personnel injury.
Some special valves require emergency opening or closing under special circumstances, and the valve actuator can prevent further spread of danger while minimizing factory losses. For some high-pressure and large-diameter valves, the required actuator output torque is very large. At this time, the required actuator must improve mechanical efficiency and use a high output motor in order to operate the large-diameter valve smoothly. For some small torque valves, small-sized electric valves are also used, which have advantages such as light weight, compact structure, and complete functions compared to ordinary types.