Patent ID: 7500649
Filing Date: 2009-03-10
Classification: F16K

Abstract:
1. A Vacuum valve drive for linear displacement of a valve closure along an adjustment axis between an opened position of the vacuum valve and a position in which it is closed gas-tight, comprising a drive housing which contains a substantially gas-tight working space, a piston which is displaceable inside the working space along the adjustment axis and is arranged in such a way that the piston divides the working space into a first pressure space and a second pressure space, the pressure spaces being separated by the piston in a substantially gas-tight manner, means for linear guidance of the piston along the adjustment axis, at least one connecting rod which extends parallel to the adjustment axis and is fixed to the piston and is led from the working space in a gas-tight manner into the outer region of the drive housing to the valve closure, a first connection of the drive housing, which leads into the first pressure space and by means of which gas pressure can be applied to the first gas space, a second connection in the drive housing, which leads into the second pressure space and by means of which gas pressure can be applied to the second pressure space so that the valve closure arranged on the at least one connecting rod can be moved between the opened position and the closed position by producing a gas pressure difference between the first pressure space and the second pressure space, wherein the means for linear guidance of the piston are in the form of at least one static guide rod which is connected to the drive housing and which extends parallel to the adjustment axis inside the working space and is led in a substantially gas-tight manner through the piston, and at least one precision linear bearing between the piston and the guide rod.