Patent ID: 6367770
Filing Date: 2002-04-09
Classification: F16K

Abstract:
A vacuum transfer valve for separating two vacuum chambers, comprising:a valve body having an opening, an axial direction of which defines a flow direction of the valve, and a wedge-shaped valve seat having two sealing surfaces encompassing the valve opening; a valve slide including a wedge-shaped closing member side surfaces of which extend parallel to respective sealing surfaces of the valve seat of the valve body and form with the flow direction of the valve an angle greater than 45Â°, and two, spaced from each other, circumferentially closed seals provided on the side surfaces of the closing member, the closing member having an open position, a first closing position, in which the seals remain substantially undeformed, and a second closing position in which at least one seal is deformed; and an actuation member for displacing the closing member transverse to the flow direction into the first closing position thereof, the actuation member being designed for applying a closing force of less than 0.7 kg/cm with reference to a length of a seal, wherein the closing member is displaced from the first closing position thereof into the second closing position thereof under a pressure difference between the two, separated by the valve, chambers, with a pressure in one of the chambers being no more than 100 mbar and with another of the chambers being flooded.