Advantages and disadvantages of electric actuators

Advantages and disadvantages of electric actuators

    Basic Information

    Electric Actuator (also known as Electric Actuator) 　　 English name: Electric Actuator 　　 is used in various industrial automation process control links.　　

     Industry standard: JB/T-8219-1999 　　 according to the movement mode is divided into: angular stroke, straight stroke and multi-turn 　　

     The angular stroke and linear stroke actuators are mostly modified on the basis of multi-turn type: based on multi-turn type, equipped with worm gear two-stage reduction box to form a 0-90° angular stroke electric actuator; A linear electric actuator is composed of screw components.　　

     Angular stroke: 0~90° angular stroke, used to control angular stroke valves such as ball valves, plug valves, butterfly valves and louver valves;

Multi-turn type: It needs to run more than 360° to realize the opening and closing of the valve. It is mainly used for gate valves, globe valves, pinch valves and diaphragm valves; 　　Straight stroke: The output is force, and the linear displacement is produced, mainly used for regulating valves And slide valve, it is often used to form electric valve or electric regulating valve with various valves (for example: gate valve, regulating valve, single seat valve and other linear movement valves) 　Magnetic tilting column level gauge uses AC or DC as driving energy; According to the action mode, it is divided into two categories (electric switch type and electric adjustment type). The advantages are convenient energy access, fast signal transmission speed, long transmission distance, convenient centralized control, high sensitivity and precision, and easy coordination with electric adjustment instruments. Simple installation and wiring.　　The disadvantage is that the structure is complex, and the average failure rate is higher than that of pneumatic actuators. It is suitable for places where explosion-proof requirements are not high and air sources are lacking.

    advantage

　　The advantages of electric actuators are convenient access to energy, fast signal transmission, long transmission distance of gas solenoid valve, convenient centralized control, high sensitivity and precision, convenient coordination with electric adjustment instruments, and simple installation and wiring. The disadvantage is that the structure is complex, the thrust is small, and the average failure rate is higher than that of the pneumatic actuator. It is suitable for places with low explosion-proof requirements and lack of air sources.

     Disadvantage

　　The main disadvantages of electric actuators are: 　

   The structure is more complex, and it is more prone to failure, and because of its complexity, the technical requirements for on-site maintenance personnel are relatively higher; the motor runs to generate heat, if the adjustment is too frequent, the solenoid valve is likely to cause the motor to overheat and generate thermal protection At the same time, it will also increase the wear on the reduction gear; in addition, it runs slowly. It takes a long time from the output of a signal from the regulator to the movement of the regulating valve to the corresponding position in response. This is because it is not as good as pneumatic and hydraulic. The place where the actuator is moved.

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