Vacuum valve for closing a flow path with a two-part valve disk

A vacuum valve for substantially gas-tight interruption of a flow path, comprising

• a valve housing having a first wall which has a first opening for the flow path with a geometric opening axis and a valve seat enclosing the first opening on a first side of the valve housing,
• a valve disk having
• an, in particular annular or frame-like first disk section with an outer boundary and
• a closed second disk section which is linearly movably mounted in a sealed manner within the outer boundary in the direction parallel to the opening axis relative to the first disk section between a retracted position and an extended position,
• at least one drive which is connected to the first disk section and which is formed such that the valve disk is pivotable or displaceable between
• an open position, in which the valve disk is positioned in a dwell section arranged laterally next to the first opening and releases the first opening and the flow path, and
• an intermediate position, in which the valve disk is positioned above the first opening and covers the opening cross-section of the first opening,
• by means of a transverse movement taking place substantially transversely to the opening axis, and is displaceable between
• the intermediate position and
• a closed position, in which there is a gas-tight contact between the first disk section and the valve seat which closes the first opening in a gas-tight manner and interrupts the flow path,
• by means of a longitudinal movement taking place parallel to the opening axis,
• wherein in the closed position a pressure difference on the valve disk acts substantially on the movable second disk section and the second disk section is supported directly or indirectly on the valve housing in the direction parallel to the opening axis substantially decoupled from the first disk section, wherein
• the valve seat has a sealing surface facing axially in the direction of the valve disk and extending transversely to the opening axis,
• the first disk section has a first bearing surface facing axially in the direction of the valve seat and extending transversely to the opening axis, which is arranged and formed such that in the closed position via an intermediate first seal there is an axially sealing contact with the sealing surface in a first contact area,
• the outer boundary has an inner surface facing radially inwards and extending parallel to the opening axis,
• the second disk section has an outer surface facing radially outwards and extending parallel to the opening axis, which is arranged and formed such that via an intermediate second seal a radially sealing contact is achieved with the inner surface via a second contact area between the retracted position and the extended position, and
• at least for certain radial angles about a center of the valve disk, in particular circumferentially, a first radial distance from the center to the first bearing surface is smaller than a second radial distance from the center to the second contact area.