Pendulum and slide gate vacuum valve

1. 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.

2. The valve as claimed in claim 1 , wherein the support part has, on the closing side in an edge region being enclosed by the inner circumferential area of the sealing part, a recess which runs around the outside, holds the first sealing ring and has an undercut fixing the first sealing ring in the perpendicular direction to the first valve seat.

3. The valve as claimed in claim 1 , wherein the first sealing ring is fixed to an edge region of the closing side of the support part by adhesive force.

4. The valve as claimed in claim 3 , wherein the first sealing ring is fixed to the edge region of the closing side of the support part by means of vulcanization.

5. The valve as claimed in claim 1 , wherein the first sealing ring is in the form of an O-ring.

6. The valve as claimed in claim 1 , wherein, in the case of a relative reduced pressure on the closing side of the valve plate, the sealing part is supported on the first valve seat of the valve housing.

7. The valve as claimed in claim 1 , wherein the valve housing has, in an essentially parallel position opposite to the first wall and to the first opening and a distance away, a second wall having a second opening for the flow path and a second valve seat ( 21 ) surrounding the second opening,

in the intermediate position and in the closed position, the valve plate is pivoted or displaced between the first opening and the second opening ( 20 ), and the sealing part is formed in such a way that, in the closed position with a relative excess pressure on the closing side of the valve plate, the sealing part is supported perpendicularly, essentially decoupled from the support part, on the second valve seat.

8. The valve as claimed in claim 7 , wherein the sealing part has an outer annular section and an inner plate-like section,

the outer annular section

at least partially enclosing the support part, the first sealing ring and the inner plate-like section, and

extending perpendicularly between the first valve seat and the second valve seat,

the inner plate-like section

extending radially and in an essentially gastight way between the outer annular section and the central region of the support part, and

being connected in an essentially gastight way to the support part in the central region

wherein by means of the outer annular section support on the second valve seat is provided in the case of the relative excess pressure on the closing side.

9. The valve as claimed in claim 8 , wherein the outer annular section is hollow-cylindrical.

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

at least a partial section of the sealing part projects, in the intermediate position and in the closed position, into the lateral groove, and in the closed position and in case of the pressure difference at the valve plate, the sealing part is supported on the valve housing, on a lateral area of the lateral groove.

11. The valve as claimed in claim 10 , wherein the partial section of the sealing part is formed as an outer lateral collar arranged on the sealing part.

12. The valve as claimed in claim 1 , comprising resilient means, which are arranged in such a way—acting between the support part and the sealing part—that the sealing part in the closed position, with relative pressure equality at the valve, rests on the valve housing in direction of the closing side.

13. The valve as claimed in claim 12 , wherein the resilient means are in the form of least one spring.

14. The valve as claimed in claim 1 , wherein the sealing part being connected in an essentially gastight way to the support part in the central region by means of a second sealing ring.

15. The valve as claimed in claim 1 , wherein the sealing part being connected in an essentially gastight way to the support part in the central region by means of a bellows.

16. The valve as claimed in claim 14 , wherein

the support part has, on the side opposite to the closing side in a central region located close to the central axis of the first opening in the closed position, a shaft connecting the support part to an arm, which is connected to the drive, and

the second sealing ring enclosing the shaft in an essentially gastight way by a radially sealing contact.

17. The valve as claimed in claim 1 , wherein

the valve is in the form of a pendulum valve and

the drive is formed in such a way that the valve plate is pivotable essentially parallel over the cross-section of the first opening.

18. The valve as claimed in claim 1 , wherein

the valve is in the form of a slide gate valve and

the drive is formed in such a way that the valve plate is displaceable essentially parallel over the cross-section of the first opening.