Patent ID: 6305665
Filing Date: 2001-10-23
Classification: F16K

Abstract:
A lifting, valve, which is equipped with a closing component (4a) interacting with a valve-box end seating surface (1e; 2a) wherein the latter is connected, via a valve rod (6) led out of a box (1a), to a servo-drive (13), with a bellows (4b) for sealing the valve rod passage, formed as an expansion bellows or corrugated tube (4b) which coaxially encircles the valve rod (6) and which is connected to the closing component (4a) on one side and, at its free end, has a connecting flange (40) including a conical sealing surface (4h) on the other side which bears against a complementary annular seating surface (1k) of the box (1a), and wherein the closing component (4a), the bellows (4b), and its connecting flange (40) define an integral, exchangeable closing-member unit (4),characterized in that the connecting flange (40) of the closing-member unit (4),in the region where it is connected to the bellows (4b), has a fastening component (4f) indirectly supported on the box side to absorb, in a way free from bending moments to a very large extent, the forces resulting from the valve-lift induced deformation of the bellows (4b) and/or the respective pressure in the box (1a), and,in the region of its conical scaling surface (4h), is reduced to a minimal wall thickness meeting the strength-related requirements, in the form of a diaphragm-shaped sealing element (4l),and that the diaphragm-shaped sealing element (4l), on its side facing away from the conical scaling surface (4h) has at least one biased elastic thrust ring (5) which presses the sealing surface (4h) onto the complementary annular seating surface (1k).