Patent ID: 7621416

Claim:
A cover for a container comprising a shell bulged upwards; a hollow ( 2 ) having an elliptical outline pointed downwards and towards an inside of the container and disposed in said shell; a spherical projection ( 3 ), pointed upwards, and disposed in the hollow; a cylindrical cavity ( 4 ) disposed in the spherical projection ( 3 ); an opening ( 5 ) in a bottom of the cylindrical cavity; a valve head ( 6 ) formed as a circular plate ( 7 ) attached on a lower side in a middle to an end of a cylindrical stem and wherein the cylindrical stem is moveably supported in the opening ( 5 ); a ring shaped gasket ( 9 ) disposed on the bottom of the cylindrical cavity; an edge ( 8 ) forming a circle and disposed on the circular plate ( 7 ), having a triangular outline for engaging with the ring shaped gasket ( 9 ), wherein the ring shaped gasket ( 9 ) and the edge ( 8 ) disposed on the circular plate ( 7 ) form a vacuum valve, a sleeve ( 10 ) ending with the flange ( 11 ) with distancing projections in the form of radial ribs, wherein the head valve is installed loosely in the opening ( 5 ) by means of the sleeve ( 10 ), wherein the spherical projection ( 3 ) includes an inner ring and an outer ring and wherein a free end of the bonnet engages between the inner ring and the outer ring.