The valve positioner is the main accessory of the control valve. It uses the valve stem displacement signal as the input feedback measurement signal, and uses the controller output signal as the setting signal for comparison. When there is a deviation between the two, the output is changed to the output of the actuator. The signal causes the actuator to act, establishing a one-to-one correspondence between the valve stem displacement and the controller output signal. Therefore, the valve positioner constitutes a feedback control system in which the valve stem displacement is a measurement signal and the controller outputs a set signal. The manipulated variable of the control system is the output signal of the valve positioner to the actuator.

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