A device for controlling the position of a rotary valve, preferably a quarter-turn valve, and comprising: - a rotatable element arranged in a housing and configured to control the position of the rotary valve on the basis of its rotation in a direction or in the opposite direction; - Means (2, 3, 21, 22, 30, 50, 52) to cause said rotation of the rotatable element, said means comprising a first antagonist feeder conduit and a second antagonist feeder conduit, wherein a first septum is arranged inside the first feeder conduit in a sliding manner with a linear motion through the injection of a pressurized fluid, said first feeder conduit having a first base disposed on the housing and being closed on the top by a first closing plug, the first feeder conduit being provided with an opening between the first base and the first septum for the injecting of said pressurized fluid so that the first septum is movable from the first base towards the first closing plug; and wherein a second septum is arranged inside the second feeder conduit in a sliding manner with a linear motion, said second feeder conduit having a second base and being closed on the top by a second closing plug; - said rotatable element being a pulley; - said means (21, 22, 30, 50, 52) further comprise at least one wire (21, 22) fixed to the said pulley and to said two septa (30, 52) in such a way as to cause the rotation in a direction or in the opposite direction of the pulley in correspondence of the application of a pre-determined traction on the wire obtained through the linear motion generated by said two septa (30, 52); - elastic means acting on the second septum in a such a manner to guarantee the return to the initial position of the second septum once the first feeder conduit is depressurized; - said elastic means being interposed between the second septum and the second base of the said second feeder conduit so that the injection of the pressurized fluid between the first septum and the first base of the first conduit causes the lifting of the first septum towards the first closing plug causing a traction on the wire that drags the second septum towards the second base of the feeder conduit thereby compressing said elastic means, said elastic means causing the return of the second septum in the initial position once the first feeder conduit is depressurized; - and wherein no further opening for injecting a pressurized fluid is comprised between the first and the second septum and the respective closing plug of the first and the second feeder conduit. - a rotatable element arranged in a housing and configured to control the position of the rotary valve on the basis of its rotation in a direction or in the opposite direction; - Means (2, 3, 21, 22, 30, 50, 52) to cause said rotation of the rotatable element, said means comprising a first antagonist feeder conduit and a second antagonist feeder conduit, wherein a first septum is arranged inside the first feeder conduit in a sliding manner with a linear motion through the injection of a pressurized fluid, said first feeder conduit having a first base disposed on the housing and being closed on the top by a first closing plug, the first feeder conduit being provided with an opening between the first base and the first septum for the injecting of said pressurized fluid so that the first septum is movable from the first base towards the first closing plug; and wherein a second septum is arranged inside the second feeder conduit in a sliding manner with a linear motion, said second feeder conduit having a second base and being closed on the top by a second closing plug; - said rotatable element being a pulley; - said means (21, 22, 30, 50, 52) further comprise at least one wire (21, 22) fixed to the said pulley and to said two septa (30, 52) in such a way as to cause the rotation in a direction or in the opposite direction of the pulley in correspondence of the application of a pre-determined traction on the wire obtained through the linear motion generated by said two septa (30, 52); - elastic means acting on the second septum in a such a manner to guarantee the return to the initial position of the second septum once the first feeder conduit is depressurized; - said elastic means being interposed between the second septum and the second base of the said second feeder conduit so that the injection of the pressurized fluid between the first septum and the first base of the first conduit causes the lifting of the first septum towards the first closing plug causing a traction on the wire that drags the second septum towards the second base of the feeder conduit thereby compressing said elastic means, said elastic means causing the return of the second septum in the initial position once the first feeder conduit is depressurized; - and wherein no further opening for injecting a pressurized fluid is comprised between the first and the second septum and the respective closing plug of the first and the second feeder conduit.