PURPOSE: To remove foreign matter and to resume normal open/close operation of valve again, by automatically inverting a motor for driving the valve by means of a torque switch which opens/closes upon sticking of valve.

CONSTITUTION: A valve drive motor 1 rotates forward upon closure of a forward rotation electromagnetic contactor 2 so as to operate a valve coupled directly with said motor 1 to open side. Said motor 1 rotates reversely upon closure of a reverse rotation electromagnetic contactor 3 so as to operate the valve to close side. If the motor bites a foreign matter during closing operation and a torque switch 9 at valve close side opens, an operating coil 3c of the reverse rotation contactor is de-energized to stop the valve drive motor 1. When a torque switch 9a at the closing side closes, an operating coil 2c of the forward rotation contactor is energized through a limit switch 8 and a close signal contact 5 to open the valve.