Electric regulating valve is an important unit instrument in industrial automation process control. With the increasing degree of automation in the industrial field, it is being more and more applied in various industrial production fields. Compared with the traditional pneumatic control valve has obvious advantages: electric control valve energy saving (only when working to consume electric energy), environmental protection (no carbon emissions), fast and convenient installation (without complex pneumatic pipeline and air pump workstation).
A.Action principle: 220VAC or 380VAC motor power supply, control signal 4~20mA, the valve has a controller, the controller converts the current signal into the stepper motor Angle stroke signal, motor rotation, by gear, lever, or gear plus lever, drive the valve stem operation, to achieve straight stroke or Angle stroke
Feedback: The motor runs through the gears, and the positioning signal of the valve is output by the sliding rheostat of the tripper, in addition to the limit signal of the three wires (all open, all closed. Common line)
B.Electric principle of electric regulating valve
Electric regulating valve through the reception of industrial automation control system signals (such as: 4~20mA) to drive the valve to change the size of the cross-sectional area between the valve core and the valve seat control pipeline medium flow, temperature, pressure and other process parameters. Realize automatic adjustment function.
The new electric regulating valve actuator contains feeding function, accepts the unified 4-20mA or 1-5V·DC standard signal, converts the current signal into the corresponding linear displacement, automatically controls the opening of the regulating valve, to achieve the continuous adjustment of the pipeline fluid pressure, flow rate, temperature, liquid level and other process parameters.
Working power supply：DC24V,AC220V,AC380V Constant voltage class。
Input control signal：DC4-20MA or DC1-5V。
Feedback control signal：DC4-20MA(Load electrical obstruction below 500 ohms)
Electric regulating valve flow characteristics, is the valve at both ends of the pressure difference under the condition of constant, the medium flow through the electric regulating valve and its relative relationship between the opening.
Electric regulating valve flow characteristics are: linear characteristics, such as percentage characteristics and parabola characteristics of three.
Fourth. Electric regulating valve application field:
Electric power, chemical industry, metallurgy, environmental protection, water treatment, light industry, building materials and other industrial automation systems.
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