End plate, filter element, filter system and method for filtering liquid

Abstract

An end plate for filter material for filtering a liquid, particularly a hydraulic oil, having a through opening for filtered liquid, which is surrounded by a sealing ring for a connecting piece, and a cover for the filter material. The sealing ring delimits a free space for accommodating an anti-rotation lock of a switch and/or a bypass valve of a filter system. Furthermore, a filter element, a filter system and a method for filtering liquid are also disclosed.

1 . An end plate for filter material for filtering a liquid, particularly a hydraulic oil, having a through opening for filtered liquid, which is surrounded by a sealing ring for a connecting piece, and a cover for the filter material,
 wherein   the sealing ring delimits a free space for accommodating an anti-rotation lock a switch and/or a bypass valve of a filter system.   
     
     
         2 . The end plate according to  claim 1 ,
 wherein   the free space forms an accommodating pocket, which extends between the sealing ring and the cover and has a base.   
     
     
         3 . The end plate according to  claim 1 ,
 wherein   the annular space, the accommodating pocket in particular, is of annular construction.   
     
     
         4 . The end plate according to  claim 1 ,
 wherein   the cover has an inner ring, wherein the accommodating pocket is constructed between the sealing ring and the inner ring.   
     
     
         5 . The end plate according to  claim 4 ,
 wherein   the inner ring forms a positioning ring for a support tube.   
     
     
         6 . The end plate according to  claim 1 ,
 wherein   the free space has a depth in the axial direction with respect to the longitudinal extent of the sealing ring, which at least corresponds to the penetration depth of the anti-rotation lock.   
     
     
         7 . The end plate according to  claim 6 ,
 wherein   the sealing ring has an upper edge, wherein the depth of the free space is at least 5 mm, particularly at least 10 mm, in particular at least 15 mm from the upper edge of the sealing ring.   
     
     
         8 . The end plate according to  claim 1 ,
 wherein   the free space has a width in the radial direction starting from the sealing ring, which is at least 2 mm.   
     
     
         9 . A filter element for filtering a liquid, having an end plate according to  claim 1  and a filter material which is arranged on the cover and surrounds the through opening at the circumference thereof. 
     
     
         10 . The filter element according to  claim 9 ,
 wherein   a support tube is arranged on the inner side of the filter material and connected to the end plate.   
     
     
         11 . A filter system having a filter element according to  claim 9 , a filter housing, in which the filter element is arranged, and a filter head with connections, which is connected to the filter housing, wherein the filter head has an anti-rotation lock, which is connected to a switch and/or a bypass valve, wherein the filter head and the free space of the end plate form an interface. 
     
     
         12 . The filter system according to  claim 11 ,
 wherein   the bypass valve in the switched state connects the inlet side of the filter head and the outlet side of the filter head.   
     
     
         13 . The filter system according to  claim 11 ,
 wherein   the switch comprises a reed contact for generating a signal for a contamination indicator.   
     
     
         14 . A method for filtering liquid, in which liquid to be filtered is supplied to a filter system according to  claim 11 , filtered in the filter material and discharged through the through opening of the end plate as filtered liquid, wherein the switch and/or the bypass valve is actuated from a differential limit pressure between the liquid to be filtered and the filtered liquid.