Oil filter comprising a hydraulic resistance

An oil filter for removal of solid contaminants from contaminated oil, the oil filter comprising:

• a filter inlet defined by an outer surface of the oil filter adapted to receive the contaminated oil at a first pressure;
• an inner filter volume adapted to receive filtered oil at a second pressure being lower than the first pressure;
• and
• a filter outlet providing fluid/liquid communication between the inner filter volume and the surroundings in order to release the filtered oil from the inner filter volume;
• wherein the filter outlet comprises a hydraulic resistance providing a fluid/liquid flow restriction between the inner filter volume and the surroundings in order to increase the second pressure inside the inner filter volume and to release the filtered oil from the inner filter volume at a third pressure, where the third pressure is lower than the second pressure;
• and
• wherein the hydraulic resistance comprises a porous material.

An oil filter for filtering contaminated oil, comprising:

• an outer surface adapted to receive the contaminated oil at a first pressure;
• an inner volume adapted to receive filtered oil at a second pressure, the second pressure being lower than the first pressure;
• and
• an outlet contiguous with the outer surface of the oil filter providing fluid/liquid communication between the inner filter volume and a housing outlet of a housing in order to release the filtered oil from the inner volume, the outlet comprising a hydraulic resistance providing a fluid/liquid flow restriction between the inner volume and the housing outlet, the hydraulic resistance adapted to release the filtered oil from the inner volume to the housing outlet at a third pressure, the third pressure being lower than the second pressure;
• wherein the hydraulic resistance comprises a porous material.