Hopper which can set with an air overpressure

摘要

The tank has a cover (3) with a frame element (6) provided with a planar covering unit (7), which cooperates with a filling opening (2) in a sealed manner. The covering unit is arranged on a side of the frame element in a covered manner, where the side is turned toward the opening. A rotating sealing element (8) is arranged at the covering unit, and approximately corresponds to a contour of the opening and cooperates with wall elements (4) of the tank, where the wall elements comprise the opening. The sealing element is arranged between the frame element and the covering unit.