Partial-rotating driving device used for controlling valve

The invention provides a partial-rotating driving device used for controlling a valve. The partial-rotating driving device is characterized by comprising a motor, a manual mechanism, a manual/motor-driven switch mechanism, a retarding mechanism, a stroke control mechanism, a torque controlling mechanism, an incoming line sealing mechanism, a main box body and an output shaft, the motor is installed on the outer side of the main box body, a manual/motor-driven switch mechanism comprises a handle sleeve fastened on the main box body, the handle sleeve is provided with a switch handle shaft, a shifting fork on the switch handle shaft is provided with an upright post, a separator disk and a high-speed worm. The retarding mechanism is a combination of a one-stage gear pair and a two-stage worm gear pair; the incoming line sealing mechanism is arranged at the lower side of the main box body. The invention has the advantageous effects that semi-automatic electric precedence is realized by the mechanism, the sealing property of product electrical wiring is ensured through the arrangement of the incoming line sealing mechanism; since the motor is arranged outside, the volume of the control cavity of the main box body is enlarged so that support subservience control elements can be arranged conveniently; and ideal product ratio range is achieved due to the arrangement of the retarding mechanism, thereby obtaining larger output rotation speed range.