Fluid filter with a valve unit and filter element for use in the fluid filter

A filter insert for use in a fluid filter having a housing, having a fluid inlet that opens into a raw side of the fluid filter, a fluid outlet that goes out from a clean side of the fluid filter, and a valve unit with a valve plate situated concentrically in the housing and having a basic shape of a circular annular disc, valve openings in the valve plate, and a flexible valve membrane in a shape of a circular annular disc situated on the valve plate and configured to cover the valve openings, wherein the valve unit has a filter bypass valve and has a non-return valve;

• wherein the valve plate and the valve membrane are each both a part of the filter bypass valve and also a part of the non-return valve, wherein, seen in a radial direction, the valve membrane has two membrane regions adjacent in the radial direction, a first membrane region being assigned to the non-return valve and a second membrane region being assigned to the filter bypass valve, wherein the fluid filter has a central pipe socket having a first end that is threaded and a second end, opposite the first end, that is threaded, the first end of the central pipe socket removably screwed into the valve unit and the second end of the central pipe socket removably screwed into a first end of the housing, the first end of the housing opposite a second end of the housing, and the second end of the housing configured to receive the filter insert, wherein the filter insert comprises
• on an end face facing the valve unit in an installed state, an axially protruding pressure-exerting ring in a form of a peripheral annular collar;
• wherein when the filter insert is installed in the housing
• the valve membrane is configured to be pressed onto the valve plate with the pressure-exerting ring so as to separate the raw side and clean side of the fluid filter from one another,
• the filter insert presses the valve membrane axially onto the valve plate with an end face of the pressure-exerting ring,
• the filter insert surrounds the central pipe socket,
• the valve plate sits in sealing fashion on an outer periphery of the central pipe socket, and,
• the filter insert presses the valve membrane onto the valve plate with the pressure-exerting rind, situated on the filter insert;
• wherein at opening the non-return valve the first membrane region is deflected around the pressure-exerting ring in a direction away from the valve plate;
• and
• wherein at opening the filter bypass valve the second membrane region is deflected around the pressure-exerting ring in a direction away from the valve plate
• wherein the pressure-exerting ring is one of connected to or made in one piece with an end disc of the filter insert that faces the valve unit in the installed state of the filter insert;
• and
• wherein the pressure-exerting ring has on an outer peripheral surface at least one radially protruding support element that is axially set back relative to the end face of the pressure-exerting ring, in which the at least one radially protruding support element is configured to engage a spring disc to pre-tension or exert pressure on the spring disc in a direction toward the valve membrane in the installed state of the filter insert.