Liquid filter having a filter bypass valve and filter insert therefor

摘要

Liquid filters comprising a housing having a removable cover, a liquid inlet, an outlet, a replaceable hollow cylindrical filter material insert, and a filter bypass valve comprising a valve seat arranged on the filter insert and a valve body that interacts with the valve seat and is biased in the closing direction. Two radially spaced closed sealing contours are provided between the valve seat and the valve body. At least one bypass channel, connecting the unfiltered and filtered side of the filter while bypassing the filter insert, passes through the valve seat between the sealing contours. The valve body is movably guided in the housing on a housing part, the two sealing contours are offset from each other in the axial direction, and the valve body has a corresponding conical or tapered or dome-like shape in the sealing area of the valve body that interacts with the sealing contours.

主权项

1. A liquid filter comprising:
a housing having a removable cover, an inlet for liquid to be filtered which opens into an unfiltered side of the liquid filter, an outlet for filtered liquid which starts from a filtered side of the liquid filter, a replaceable filter insert which separates the unfiltered side and the filtered side from one another and which comprises a hollow cylindrical filter material element having a central axis and enclosed at the end faces by two end discs, a filter bypass valve, comprising a valve seat arranged on the filter insert and a valve body which interacts with the valve seat and is acted upon by a preload force in the closing direction, two closed sealing contours, arranged one inside the other as viewed in the radial direction, provided between the valve seat and the valve body, at least one bypass channel, which connects the unfiltered side and the filtered side of the liquid filter while bypassing the filter material element, passing through the valve seat between the sealing contours, the valve body being movably guided in the filter housing on a filter housing part, the two sealing contours being offset from each other in the axial direction, and the valve body having a shape in the sealing area of the valve body that interacts with the sealing contours that is one of conical, tapered and dome-like.