Patent ID: 8176942

Claim:
A closing device for a pipe connection piece of a vacuum user system comprising: a cover; a closing element; a sealing bellows; and an element, wherein the closing element is insertable into the pipe connection piece and is connected to the cover by a spacer and substantially fully covers a cross section of the pipe connection piece; wherein the sealing bellows is located between the cover and the closing element and at least partly encloses the spacer, wherein the sealing bellows comprises a sealing face; wherein the element is movable in relation to the cover, and is movable from a first position to a second position, wherein the movable element engages the sealing bellows such that the sealing face of the sealing bellows in the second position has a greater extension in a plane across the spacer than it has in the first position; and wherein the closing element is arranged so as to be at a fixed distance from the cover.