Abstract: The invention relates to a vacuum valve for substantially gas-tight closure of a first valve opening including a valve seat, a closure element for substantially gas-tight closure of the first valve opening, and a drive unit for providing a movement of the closure element relative to the valve seat. The closure element is designed to be flexible in such a way that a spatial expansion of the closure element in the closed position is variable in a direction parallel to the opening axis as a function of an applied differential pressure.

Abstract: Disclosed is a vacuum valve system for a vacuum transport system, including a valve seat assembly having a first valve opening defining an opening axis and a first sealing surface surrounding the first valve opening; a closure component for closing of the first valve opening with a second sealing surface corresponding to the first sealing surface; and a drive unit for the closure component. The valve seat assembly can be combined with the transport tube to provide a gas-tight transition between the valve seat assembly and the transport tube, and the first valve opening. At least the valve seat assembly and the closure component are formed as separate system components that can be modular, and the closure component the valve seat assembly can be modular so that the open position and the closed position for the closure component is driven by the drive unit.