This device comprises a body (2) having outlets (8), and a bonnet (3) housing a rotor (6) being submitted to the action of the inflowing fluid and being connected to a reducing gear (15) activating the closing device. This device is characterized in that the opening of the outlets (8) is carried out with respective angularly sliding shutters (9) being turned by means successively shifting them in opposite directions to thus respectively obtain the opening and closing of the outlets (8). The means shifting the shutters (9) are made up by studs (12, 13 and 14) being provided on the lower surface of the rotary intermediary plate (4) being solid with the reducing gear (15).