Sealing element, annular filter element, oil separator, and method for controlling prevailing pressure in crankcase ventilation system

A filter element for an oil separator of a crankcase ventilation system, the filter element comprising:

• at least one filter medium surrounding a central axis, the at least one filter medium configured to separate oil from aerosol, the at least one filter medium having an axial end surface forming a covering surface extending in a radial direction relative to the central axis;
• a cover element formed as an annular end plate, fixed onto and fully covering the covering surface of the at least one filter medium, the cover element including:
• a clean fluid discharge opening configured to remove cleaned fluid from an interior of the at least one filter medium;
• wherein the cover element has a valve seat having an annular sealing surface surrounding the clean fluid discharge opening, the annular sealing surface configured for a pressure control valve body of the crankcase ventilation system to close against.