Patent ID: 6899316

Claim:
A closure device for vacuum closure of at least one opening in a wall, comprising: a valve plate which is associated with a respective opening and which is displaceable between an open position in which it releases the opening, a position in which it covers the opening but is raised from the wall, and a closed position in which it covers the opening and contacts the wall; at least one piston-cylinder unit which serves to displace the valve plate/between its open position and its position in which it covers the opening but is raised from the wall and which comprises a pneumatically actuated piston which is arranged in a cylinder housing and which is outfitted with a piston rod leading out of the cylinder housing through a first bore hole; at least one carrier unit which is connected to the piston rod of the at least one piston-cylinder unit and which is associated with a respective valve plate, having at least one cylinder bore hole in which is arranged the pneumatically actuated piston which serves to displace the valve plate between its position in which it covers the opening but is raised from the wall and its closed position and which is outfitted with a piston rod leading out of the carrier unit through the first bore hole, the valve plate being fastened to said piston rod; said at least one cylinder bore hole of the at least one carrier unit being closed by a removable cover; at least a first pair of sealing rings being arranged between said cover and the carrier unit; and a first line which is connected to the atmosphere or can be evacuated leading into a space enclosed by the two sealing rings.