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The Working Principle of Electric Actuator

The Working Principle of Electric Actuator

Generally speaking,  electric actuator = electric operator. Textbooks and other textbooks refer to: electric actuator = electric operator + valve body.


As there are many types of valves: straight-through valve, butterfly valve, ball valve, gate valve and so on, electric actuators + various valves form another category of products-electric regulating valves (also subdivided into: electric regulating through valves, electrically operated butterfly valve, electric ball valve, etc.). Therefore, it is customary for electric actuators to refer to electric operator, without valve bodies.


1. Introduction of electric operator


It is composed of electric motor, deceleration mechanism, limit mechanism, over-torque protection mechanism and position feedback device.


The electric operator uses the motor as the driving source and the direct current as the control and feedback signal.


When the host instrument or computer sends out the control signal, the electric operator will act in proportion to the magnitude of the signal, and the valve or damper will be opened to the corresponding opening through the output shaft, and the system opening signal will be fed back to the control room to complete the adjustment function of the system.


2. Electric operators can also be used with instruments such as manipulators and servo amplifiers


(1) The function of the manipulator is:

A. Transmit the signal, provide visual input and feedback signal value for the operator in the control room, which is convenient for observing the valve position on site.

B. When the control signal fails or the system is overhauled, it can be used to directly operate the electric actuator to complete manual manual operation in the case of accident overhaul.


(2) The role of the servo amplifier (ie position locator) is:

Signal amplification, it accepts 4-20mA control signal, amplifies the signal into a strong electric signal that can control the forward and reverse rotation of the motor, and controls the actuator to realize forward or reverse rotation.


(3) The servo amplifier has two modes for customers to choose:

A. The control panel of the actuator itself has a servo amplifier function, which is compact in structure, does not need to occupy the space behind the instrument panel, and is relatively simple to install and debug (ie, electronic integration).

B. The other is a separate position locator, which is installed on the dashboard. This is a more traditional application method, which is easier to repair and replace (ie, discrete proportional adjustment type).

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