The valve positioner is a new generation high-performance intelligent valve positioner equipped with a microprocessor. The intelligent positioner receives DC current signals from the control device and controls the pneumatic control valve. In addition to this basic function, it also has communication function, automatic configuration program, and self diagnostic function, which will greatly improve productivity and factory operation efficiency. These advanced features can also be achieved through communication devices such as HART, APL, FF, etc. It can be stably used for linear or angular stroke control valves with single acting (spring reset) pneumatic actuators or double acting pneumatic actuators.