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To Improve The Performance Of The Control Valve
Jun 12, 2018

According to the input signal, the valve positioner is divided into a pneumatic valve positioner, an electric valve positioner, and a smart valve positioner. The input signal of the pneumatic valve positioner is a standard gas signal, for example, 20 to 100 kPa gas signal, and its output signal is also a standard gas signal. The input signal of the electric valve positioner is a standard current or voltage signal, for example, 4~20mA current signal or 1~5V voltage signal, etc. The electric signal is converted into electromagnetic force inside the electric valve positioner, and then the gas signal is output to the toggle. Control valve. Intelligent electric valve positioner converts the current signal output from the control room into the gas signal that drives the regulating valve. According to the valve stem friction when the regulating valve works, it counteracts the unbalanced force caused by the medium pressure fluctuation and makes the valve opening correspond to the control. Room output current signal. And can carry on the intelligent configuration to set up the corresponding parameter, achieves the purpose which improves the control valve performance.

1, according to the direction of action can be divided into one-way valve positioner and two-way valve positioner. When the one-way valve positioner is used in a piston type actuator, the positioner only has one direction and the two-way positioner acts on both sides of the cylinder of the piston type actuator and acts in both directions.

2. According to the gain sign of the output and input signal of the valve positioner, it is divided into a positive acting valve positioner and a counteracting valve positioner. When the input signal of the positive acting valve positioner increases, the output signal also increases, so the gain is positive. When the input signal of the reaction valve positioner increases, the output signal decreases, so the gain is negative.

3, according to the valve positioner input signal is an analog signal or digital signal, can be divided into ordinary valve positioner and field bus electrical valve positioner. The input signal of an ordinary valve positioner is an analog air pressure or current and voltage signal, and the input signal of the field bus electric valve positioner is a digital signal of a field bus.

4, according to whether the valve positioner with CPU can be divided into ordinary electric valve positioner and intelligent electric valve positioner. The general electric valve positioner does not have a CPU, and therefore, it does not have intelligence and cannot handle related intelligent operations. The intelligent electric valve positioner with CPU can handle intelligent calculations. For example, it can perform non-linear compensation of the forward channel, etc. The field bus electric valve positioner can also be equipped with PID and other functional modules to achieve corresponding operations.


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