Patent ID: 7967977
Filing Date: 2011-06-28
Classification: B01D

Abstract:
1. A filter device for hydraulic systems, comprising: a filter housing removably couplable to a filter head; a filter element removably received in said filter housing in an operating position for a filtering operation and separating an unfiltered side and a filtered side in said filter housing; a display device indicating a presence or an absence of said filter element in the operating position in said filter housing, said display device having an opening in a wall of said filter housing and a closure blocking said opening when said filter element is in the operating position in said filter housing to indicate the presence of said filter element and clearing said opening when said filter element is absent from said filter housing to indicate the absence of said filter element, said closure having at least one closing body with a sealing element on an outside surface thereof forming a seal between said closing body and said opening when said filter element is in the operating position, said closing part being formed by a bearing part of said filter element, said bearing part being accommodated in a seat of said filter housing in the operating position, said seat being formed by a pipe-shaped depression in a base of said filter housing surrounding said opening concentrically and having an inner wall engaged by said sealing element in the operating position; and a support pipe supporting filter material of said filter element, said bearing part being an extension on one end of said support pipe.