Patent ID: 7654505
Filing Date: 2010-02-02
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 closure unit which is arranged in an interior space of the valve housing and which has a valve plate which is adjustable between an open position in which it releases the inlet opening, an intermediate position in which it covers the inlet opening but is lifted from the valve seat, and a closed position in which it covers the inlet opening and is pressed against the valve seat; at least one adjusting piston which is arranged in an interior space of the closure unit and, for the purpose of adjusting the valve plate between its intermediate position and its closed position, being displaceable in direction of its longitudinal center axis between a passive position in which the valve plate is in its intermediate position and an active position in which the valve plate is in its closed position; at least one work space of the closure unit that can be acted upon by pressure gas for displacing said at least one adjusting piston into its active position being bounded by a diaphragm seal; at least one tappet being arranged at the adjusting piston on the side facing the outlet opening; and said at least one tappet being guided out of the interior space of the closure unit through an opening and being supported directly or indirectly at the valve housing in the area next to the outlet opening for pressing the valve plate against the valve seat when the adjusting piston is displaced from its passive position into its active position.