Container closure for a beverage can

A container closing device for a beverage can having an opening tab which is disposed on a can lid, is pivotable about a pivot reception formed in a lid bottom and comprises a push opener on one side of a pivot axis received in the pivot reception and an actuating end on an opposite side of the pivot axis for handling, the lid bottom comprising a closing piece, which is divided from the surrounding lid bottom via a rupture inducing score, below the push opener in such a manner that the closing piece is pressurized via the push opener as a result of a pivoting movement of the opening tab and is detached from the connection to the surrounding lid bottom along the rupture inducing score for releasing a pouring opening, the container closing device having a pouring protrusion which is disposed on the same side of the pivot axis as the push opener, covers the closing piece and comprises a support end for supporting the pouring protrusion at the lid bottom during the pivoting movement of the opening tab, the opening tab being provided with a reactive surface on its underside facing the lid bottom for contact with a liquid pouring from the pouring opening, a sealed space being realized in the area of the reactive surface and the closing piece between the pouring protrusion and the lid bottom so that the reactive surface is disposed at least partially in the sealed space and is sealed against an environment.