Principle of electric actuator, working principle of electric actuator
Popular idiom: electric actuator = electric actuator
Textbooks and other teaching materials refer to: electric actuator = electric actuator + valve body
Because there are many types of valve bodies: direct valve, electric butterfly valve , ball valve, gate valve and so on.
Electric actuator + various valve bodies form another type of product-electric regulating valve (also can be divided into: electric regulating straight valve, electric regulating butterfly valve, electric regulating valve, etc.).
Therefore, it is customary that an electric actuator refers to an electric actuator without a valve body.
This machine is composed of electric motor, reduction mechanism, limit mechanism, over-torque protection mechanism and position feedback device.
The electric actuator uses the electric motor as the driving source and the direct current as the control and feedback signal.
When the upper instrument or computer sends out a control signal, the electric actuator moves in proportion to the size of the signal, opens the valve or damper to the corresponding opening degree through the output shaft, and feeds back the system opening signal to the control room to complete the system Adjustment function.
Electric actuators can also be used with instruments such as manipulators and servo amplifiers.
The role of the operator is:
A. Pass the signal, and provide the operator with visual input and feedback signal value in the control room, which is convenient for observing the valve position on site.
B. When the control signal fails or the maintenance system, it can be used to directly operate the electric actuator to complete the manual operation in the case of accident maintenance.
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 achieve forward rotation or reverse rotation.
The servo amplifier has two modes for customers to choose:
A. One is the servo amplifier function on the control board of the actuator itself. It has a compact structure, does not need to occupy the space behind the instrument panel, and is simple to install and debug (ie, electronic integration).
B. The other is a separate position locator, which is a more traditional application method after installation on the instrument panel, and it is easier to repair and replace (ie, discrete proportional adjustment type).
The electric actuator is connected with various valve bodies to form various regulating valves.
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