Vacuum valve for a vacuum conveying system

A valve for closing and opening a valve opening in a gas-tight manner and for ventilating a vacuum volume, for a vacuum conveying system having a transport tube for transporting an object inside along the transport tube, comprising

• a valve seat having the valve opening defining an opening axis and a first sealing surface.
• a closure element for the substantially gas-tight closure of the valve opening with a second sealing surface corresponding to the first sealing surface, wherein
• the closure element is arranged to be movable along the opening axis and relative to the valve seat in such a way that the closure element is adjustable from an open position, in which the closure element at least partially clears the valve opening, into a closed position, in which the second sealing surface is pressed or pulled in the direction of the first sealing surface and the closure element closes the valve opening, and back again, and
• the second sealing surface is in an opposing position relative to the first sealing surface, and
• a valve housing which at least partially encloses the closure element,
• wherein
• the closure element has a closure part, and an adjusting part.
• the closure part is designed for substantially gas-tight closure of the valve opening, and the second sealing surface is arranged on the closure part,
• the adjusting part delimits a stroke volume inside the valve housing, wherein a size of the stroke volume is variable as a function of a position of the closure element along the opening axis, and
• the valve has a lifting and holding unit designed and arranged to provide a lifting force for displacing and/or holding the closure element to or in the closed position.