How Electric Actuators Work

Electric actuators are used to drive the valve to a fully open or fully closed position. The electric actuator for control valve can accurately move the valve to any position. Although most electric actuators are used to open and close valves, the design of today's electric actuators goes far beyond simple switching functions. They include position sensing devices, torque sensing devices, electrode protection devices, logic control devices and digital devices. Communication module and PID control module, etc. These devices are all installed in a compact housing.

More and more factories have adopted automatic control and manual operations which have been replaced by mechanical or automated equipment. It is required that the electric actuators function as an interface between the control system and the mechanical movement of the valve, and that the actuators are required to enhance the work safety performance.

In some dangerous situations, automated electric actuators can reduce personnel injuries. Some special valves require emergency opening or closing under special conditions. Electric actuators can prevent further spread of the hazard while minimizing plant damage. For some high-pressure and large-diameter valves, the required output torque of the electric actuator is very large. 

At this time, the required electric actuator must increase the mechanical efficiency and use a high-output motor, so that the large-diameter valve can be operated smoothly. For some small-torque valves, fine and small electric valves are also used. They have the advantages of lighter weight, compact structure and complete functions than those of ordinary ones.