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Simple Structure, Reliable And Smooth Operation
Jun 12, 2018

The actuator is an essential part of the automatic control system. Its role is to accept the control signal sent by the controller, change the flow of the controlled medium, so that the controlled variable is maintained at the required value or within a certain range. Actuators can be divided into three categories: pneumatic, hydraulic and electric according to their energy forms. Pneumatic actuator uses compressed air as its energy source. Its characteristics are simple structure, reliable and smooth operation, large output thrust, easy maintenance, fire and explosion protection, and low price, so it is widely used in chemical, papermaking, oil refining and other production processes. It can be conveniently used with passive meters. Even when using electric meters or computer controls, pneumatic actuators can be used as long as the electrical signals are converted to standard pressure signals of 20-100 kPa via electro-pneumatic converters or electro-pneumatic valve positioners. The electric actuator has convenient access to energy and rapid signal transmission, but its structure is complex and its explosion-proof performance is poor. Hydrodynamic actuators are basically not used in chemical, oil refining, and other production processes. Its characteristic is that the output thrust is large.

Actuators are actuators and control valve assemblies in automatic control systems. Its role in the automation control system is to receive signals from regulators or computers (DCS, PLC, etc.) to adjust the flow of the process media with its position and characteristics in the process piping, so that the controlled automation instrument will be produced. Within the required range of the process.