Patent ID: 7802772

Claim:
A valve for essentially gastight closing of a flow path, comprising a valve housing having a first wall, which has a first opening for the flow path and a first valve seat surrounding the first opening, a valve plate having a closing side on which a first sealing ring corresponding with the first valve seat is arranged, and at least one drive, by means of which the valve plate is pivotable or displaceable from an opened position in which the flow path is essentially unobstructed to an intermediate position essentially parallel to the first valve seat over the cross-section of the first opening and the perpendicular distance between the valve plate and the first valve seat can be reduced from the intermediate position to a closed position in such a way that the flow path is closed essentially gastight by an axially sealing contact between the first sealing ring and the first valve seat, wherein the valve plate has a support part which is connected to the drive, fixes the first sealing ring in the perpendicular direction to the first valve seat, supports the first sealing ring, and presses the first sealing ring onto the first valve seat in the closed position of the valve, and a sealing part, being movably mounted on the support part so as to be movable relative to the support part and thus being decoupled from the support part within a certain range of movement in a direction essentially perpendicular to the first valve seat, being connected in an essentially gastight way to the support part in a central region, and having an inner circumferential area in an outer region which encloses the first sealing ring on an outer circumferential side of the support part in an essentially gastight way by a radially sealing contact, wherein the support part and the sealing part together form the essentially gastight valve plate, and wherein in the closed position, a pressure difference at the valve plate acts essentially on the sealing part, and the sealing part is supported perpendicularly and in a manner essentially decoupled from the support part on the valve housing.