Valve for essentially gastight closing a flow path

1. 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 ) 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 ) 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 ) and the first valve seat ( 4 ),

wherein the valve disk ( 5 ) has

an outer disk section ( 9 ) which

is connected to the drive ( 8 ) and

fixes the sealing ring ( 7 ) 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 ) and thus being decoupled from the outer disk section ( 9 ) within a certain 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 ), wherein an essential gastight contact in radial direction is provided between the sealing ring ( 7 ) and the outer circumferential area ( 11 ) within said certain range of movement,

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 and in a manner essentially decoupled from the outer disk section ( 9 ) on the valve housing ( 1 ; 1 a ).

2. The valve as claimed in claim 1 , wherein the outer disk section ( 9 ) has, on the closing side ( 6 ) in an edge region enclosing the inner disk section ( 10 ), a recess ( 13 ) which runs around the inside, holds the sealing ring ( 7 ) and has an undercut ( 14 ) fixing the sealing ring ( 7 ) in the perpendicular direction to the first valve seat ( 4 ).

3. The valve as claimed in claim 1 , wherein the sealing ring ( 7 ) is in the form of an O-ring.

4. The valve as claimed in claim 1 , wherein, in the case of a relative reduced pressure ( 25 ) on the closing side ( 6 ) of the valve disk ( 5 ), the inner disk section ( 10 ) is supported on the first valve seat ( 4 ) of the valve housing ( 1 ).

5. The valve as claimed in claim 1 , wherein

the valve housing ( 1 ) has, in an essentially parallel position opposite to the first wall ( 2 ) and to the first opening ( 3 ) and a distance away, a second wall ( 19 ) having a second opening ( 20 ) for the flow path (F) and a second valve seat ( 21 ) surrounding the second opening ( 20 ),

the valve disk ( 5 ) is pivotable or displaceable between the first opening ( 3 ) and the second opening ( 20 ) and

the inner disk section ( 10 ) is formed in such a way that, in the closed position (C) with a relative excess pressure ( 26 ) on the closing side ( 6 ) of the valve disk ( 5 ), the inner disk section ( 10 ) is supported perpendicularly, essentially decoupled from the outer disk section ( 9 ), on the second valve seat ( 21 ).

6. The valve as claimed in claim 5 , wherein the inner disk section ( 10 ) has a support frame ( 22 ) which extends perpendicularly to the second valve seat ( 21 ) and by means of which support on the second valve seat ( 21 ) is provided in the case of the relative excess pressure ( 26 ).

7. The valve as claimed in claim 1 , comprising an inner lateral groove ( 27 ) in the valve housing ( 1 a ), which groove is formed and arranged in such a way that

at least a partial section of the inner disk section ( 10 )—in particular a support frame ( 22 a ) arranged on the inner disk section ( 10 )—projects in the closed position (C) into the lateral groove ( 27 ) and

the inner disk section ( 10 ) is supported on the valve housing ( 1 a ), on a lateral area ( 28 ; 29 ) of the lateral groove ( 27 ).

8. The valve as claimed in claim 1 , comprising resilient means, which are arranged in such a way—acting between the outer disk section ( 9 ) and the inner disk section ( 10 )—that the inner disk section ( 10 ) in the closed position (C), with relative pressure equality at the valve, rests on the valve housing ( 1 ; 1 a ).

9. The valve as claimed in claim 1 , wherein the valve disk ( 5 ) has on the side ( 17 ) opposite to the closing side ( 6 ), a strut system ( 16 ) which connects the outer disk section ( 9 ) to an arm ( 23 ), which is connected to the drive ( 8 ), in a central region located close to the central axis ( 18 ) of the first opening ( 3 ).

10. The valve as claimed in claim 9 , comprising a ball joint ( 24 ) which connects the arm ( 23 ) to the strut system ( 16 ) in such a way that the valve disk ( 5 ) is aligned parallel with the first valve seat ( 4 ) on pressing the sealing ring ( 7 ) onto the first valve seat ( 4 ).

11. The valve as claimed in claim 1 , wherein

the valve is in the form of a shuttle valve and

the drive ( 8 ) is formed in such a way that the valve disk ( 5 ) is pivotable essentially parallel over the cross-section of the first opening ( 3 ).

12. The valve as claimed in claim 1 , wherein

the valve is in the form of a sliding valve and

the drive ( 8 ) is formed in such a way that the valve disk ( 5 ) is displaceable essentially parallel over the cross-section of the first opening ( 3 ).

13. The valve of claim 8 wherein the resilient means comprises at least one spring.