Actuators are an essential part of an automatic control system. Its function is to accept the control signal sent by the controller, change the size of the controlled medium, so that the controlled variable is maintained in the required value or within a certain range.
Actuator According to its energy form can be divided into pneumatic, hydraulic, electric three categories. Pneumatic actuator with compressed air as energy, its characteristics are simple structure, reliable movement, smooth, large output thrust, easy maintenance, fire and explosion-proof, and low price, so widely used in chemical, paper, oil refining and other production processes, it can be easily used with passive instrumentation. Even when using an electric instrument or computer control, a pneumatic actuator is still available as long as the electrical signal is converted to a standard air pressure signal of 20-100KPA by an electric-gas converter or an electro-gas valve locator. The energy of the electric actuator is convenient and the signal is transmitted quickly, but the structure is complex and the explosion-proof performance is poor. Hydraulic actuator in chemical industry, oil refining and other production process is basically not used, it is characterized by a large output thrust.
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