Patent ID: 7658367

Claim:
A valve for essentially gastight closing of a flow path (F), comprising a valve housing ( 1 , 1 a ) having a first wall ( 2 ), which has a first opening ( 3 ) for the flow path (F) and a first valve seat ( 4 ) surrounding the first opening ( 3 ), a valve disk ( 5 ) having a closing side ( 6 ) on which a sealing ring ( 7 , 7 a , 7 b , 7 c ) corresponding with the first valve seat ( 4 ) is arranged, and at least one drive ( 8 ), by means of which the valve disk ( 5 ) is pivotable or displaceable from an opened position (A) in which the flow path (F) is unobstructed to an intermediate position (B) essentially parallel to the first valve seat ( 4 ) over the cross-section of the first opening ( 3 ), wherein the sealing ring is perpendicularly displaced from the first wall ( 2 ) and first valve seat ( 4 ) during the displacement from the opened position to the intermediate position, and the perpendicular distance between the valve disk ( 5 ) and the first valve seat ( 4 ) can be reduced from the intermediate position (B) to a closed position (C) in such a way that the flow path (F) is closed essentially gastight by an axially sealing contact between the sealing ring ( 7 , 7 a , 7 b , 7 c ) and the first valve seat ( 4 ), wherein the valve disk ( 5 ) has an outer disk section ( 9 , 9 a ) which is connected to the drive ( 8 ) and fixes the sealing ring ( 7 , 7 a , 7 b , 7 c ) in the perpendicular direction to the first valve seat ( 4 ), and an inner disk section ( 10 ), which has an outer circumferential area ( 11 ), which is mounted so as to be movable relative to the outer disk section ( 9 , 9 a ) and thus being decoupled from the outer disk section ( 9 , 9 a ) within a range of movement in a direction (Z) essentially perpendicular to the first valve seat ( 4 ) and whose outer circumferential area ( 11 ) is enclosed essentially gastight with an inner seal by the sealing ring ( 7 , 7 a , 7 b , 7 c ), wherein the sealing ring ( 7 ) seals the connection between the inner disk section ( 10 ) and the outer disk section ( 9 , 9 a ) in a radial direction, wherein, in the closed position (C), a pressure difference at the valve disk ( 5 ) acts essentially on the inner disk section ( 10 ), and the inner disk section ( 10 ) is supported perpendicularly on the valve housing ( 1 , 1 a ) and in a manner enabling displacement relative to the outer disk section ( 9 , 9 a ) within a range of movement.