Abstract: An automatic sealing valve having a cylindrical inflation nozzle, which has a cone-shaped wall section in its lower area, which a welding rim adjoins. The welding rim is connected by a peripheral joint with a foil of the inflatable body. A pressure membrane is peripherally welded at the peripheral joint at the lower end of the welding rim and forms an open air passage. The annular area formed in this way is the active pressure area with which the pressure membrane presses against the welding rim. The pressure membrane has a recess below the cone-shaped edge area which is sealingly closed by a cup-shaped receptacle. The inflation nozzle can be pushed into the receptacle with its cone-shaped edge area.