Patent ID: 7413162
Filing Date: 2008-08-19
Classification: F16K

Abstract:
1. A vacuum valve comprising: a valve housing which has an inlet opening and an outlet opening penetrating opposite walls of the valve housing; a valve seat surrounding the inlet opening; a valve disk being located in the interior space of the valve housing and being arranged at a carrying arm that is rigidly connected to a shaft; said shaft for purposes of opening and closing the vacuum valve, being rotatable around its longitudinal axis and displaceable in axial direction; a driving device by which the valve disk can be adjusted from a closed position, in which it is pressed against the valve seat, into an open position, in which it releases the inlet opening, by way of an intermediate position in which it is lifted from the valve seat by an axial displacement of the shaft; said driving device comprising a rotary drive for rotating the shaft and further comprising a driving piston being arranged in an inner cavity of the valve disk and having, at least over portions of its circumference, a radial extension which is larger than the outlet opening with respect to the center longitudinal axis of the outlet opening and at which tappets are arranged on the side facing the outlet opening; said tappets being guided out of the inner cavity of the valve disk and being supported in the closed position of the valve disk at the valve housing in the area next to the outlet opening and pressing the valve disk against the valve seat and which can be lifted from the valve housing for displacing the valve disk from its closed position into its intermediate position by a displacement of the driving piston; and at least one spring element displacing the valve disk into its intermediate position by an axial displacement of the shaft.