Overpressure valve for the content of a package

In an overpressure valve (10) for a packaging container, having a base plate (12), which is connectable to one wall (1) of the packaging container and has at least one passage opening (16) and is partially covered by a diaphragm (13) that has at least one passage (27, 28), the diaphragm being joined in its peripheral regions (23) at least partly to the base plate (12), so that upon an overpressure in the packaging container, a conduit is created from the at least one passage opening (16) in the base plate (12) to the at least one passage (27, 28), in order to conduct gas out of the packaging container through an opening (3) in the wall (1), the improvement wherein the overpressure valve (10) is connected to a wall (1) that forms the inside (2) of the packaging container;

• and wherein on the side of the base plate (12) oriented toward the inside (2), a connecting element (14) is disposed, the connecting element (14) having a closed contour, and the at least one passage (27, 28) in the diaphragm (13) being disposed inside the contour of the connecting element (14), wherein the diaphragm (13) has two layers (20, 21) comprising flexible plastic, the two layers being joined to one another over the full surface by means of an adhesive layer (25), and the layer (20) of the diaphragm (13) oriented toward the base plate (12) leaves an edge (23), which extends all the way around, on the other layer (21) of the diaphragm (13) free, that edge (23) being joined to the base plate (12).