The DKJ angular travel electric actuator serves as the actuating unit in the DDZ-II and DDZ-III series of instruments, designed for use with DDZ-II and DDZ-III control unit instruments. Powered by AC electricity, it accepts standardized input signals of 4–20 mA DC (or 0–10 mA DC) and feedback signals from position transmitters. After comparison by the servo amplifier, it outputs switching signals to drive the motor. Through mechanical reduction, the input signal is converted into corresponding angular displacement of the output shaft, automatically manipulating damping dampers, butterfly valves, ball valves, and other devices to accomplish the system's automatic regulation tasks.