Filter element and filter system for a liquid medium with ventilation on the post-filtration side and on the pre-filtration side

A filter element (10) for a liquid medium, comprising:

• an annular filter medium (16) arranged on a longitudinal axis (18) of the filter element (10);
• an upper end plate (12) arranged on an upper axial end of the annular filter medium (16), the upper end plate (12) having:
• a double walled stub (46) circumferentially surrounding a central opening (54) of the upper end plate, the double walled stub (46) projecting axially outwardly from an exterior side of the upper end plate (12) of the filter element (10), the double walled stub (46) having:
• an axially projecting annular outer wall member (48) encircling the central opening (54), having a first axial end formed on the upper end plate (12) and projecting axially outwardly from the exterior side of the upper end plate (12) to a second end;
• an axially projecting annular inner wall member (50) spaced apart radially inwardly from the annular outer wall member (48), the annular inner wall member (50) connected to the second end of the annular outer wall member (48) and projecting axially inwardly therefrom;
• an insert part (56) arranged against a radially inner side of the inner wall member (50);
• wherein the filter element (10) has:
• a pre-filtration side (26) arranged at radially outer side of the annular filter medium (16), the pre-filtration side (26) arranged fluidically upstream of the annular filter medium (16);
• and
• a post-filtration side (28) arranged at radially interior side of the annular filter medium (16), the post-filtration side (28) arranged fluidically downstream of the filter medium (16);
• a venting arrangement (30) arranged on the upper end plate (12) and venting both the pre-filtration side and the post-filtration side (26, 28) of the filter element (10) through the upper end plate (12), the venting arrangement (30) comprising:
• a first axially elongated spiral groove (60) formed between the radially inner side of the annular inner wall member (50) and the insert part (56), forming a first axially elongated spiral venting channel having an intake end fluidically connected to the pre-filtration side (26) of the filter element (10);
• a vent tube (32) connected to the upper end plate (12) and extending away from the upper end plate (12) axially in a direction of towards a lower end plate (14) of the filter element (10);
• wherein the vent tube (32) has at a first end an inlet opening (34) and at the other end an outlet opening (36);
• wherein the vent tube has formed thereon a cylindrical tube stub (40) radially surrounding the first end of the vent tube (32) and received into an annular recess of the double walled stub, between the annular outer wall member (48) and the annular inner wall member (48);
• a second axially elongated spiral groove (62) formed between the axially projecting annular outer wall member (48) and the cylindrical tube stub (40), forming a second axially elongated spiral venting channel (66) having an intake end fluidically connected to the post-filtration side (28) of the filter element (10);
• wherein the two axially elongated spiral venting channels (60,66) are in each case fluidically connected at a discharge end to the inlet opening (34) of the vent tube (32).