Patent ID: 7191903
Filing Date: 2007-03-20
Classification: B01D

Abstract:
1. A filter insert comprising an annular filter element connected in a fluid-tight manner at one axial end face to a cover and at an opposite axial end face to a base; said filter element having a central channel in which a central tube is situated extending between the cover and the base with said central channel communicating with a central opening in the cover; wherein the central tube is formed by rings arranged perpendicular to the longitudinal central axis of the central tube, and has a variable length along its longitudinal central axis, said rings being joined together in the axial direction by stays, wherein at least one of said stays has a length-compensating section with a resilient structure, said at least one stay being secured with legs positioned to be symmetrical with an axis of symmetry that runs perpendicular to the longitudinal central axis of the central tube said length-compensating section including at least one stop for limiting the minimum length of the central tube, said at least one stop being spaced from said legs.