The device (1) has a dosing chamber releasing device including separating elements (54, 76,77) movable between closing and opening positions by an inner cylinder (53) and a guiding section (55). Gas flow channels (60-63, 68) and/or a connection between one of the channels and a dosing chamber (14) is blocked and released in the respective closing and opening positions. The separating elements and/or the cylinder and the section are provided with knobs and bars in a sliding contact area, where the knobs and the bars influence sliding friction characteristics.
