Abstract: A filter element has a first follower element with a first traction surface and a second follower element with a second traction surface provided for interacting with first and second mating surfaces of the filter housing, respectively. The first and second traction surfaces interact with the first and second mating surfaces to pull out the filter element from the filter housing. The first and second traction surfaces are spaced apart from each other along a longitudinal axis of the filter element and project radially into the interior of the filter element. At least one of the first and second follower elements has a stop surface adjoining circumferentially the respective traction surface. In a position of use, the stop surface interacts with a counter stop surface of the filter housing to form an at least unidirectional rotational degree of freedom blocking about the longitudinal axis relative to the filter housing.

Abstract: An intermediate cover of a filter housing of a filter for purifying liquids can be mounted in the filter housing for separating a filter receiving space for a filter insert from a centrifuge receiving space for a centrifuge separator by a rotary and/or insertion movement relative to an imaginary axis. The intermediate cover is provided with a portion of at least one clean fluid channel forming a fluidic connection between a clean fluid side of the filter insert and a fluid outlet of the filter housing for a purified clean fluid. The filter insert has a connecting device arranged at an axial end face and connectable to the intermediate cover. An outlet opening for purified clean fluid is arranged at the axial end face and corresponds with an inlet opening of the clean fluid channel of the intermediate cover. The outlet opening at least partially forms the connecting device.

Abstract: In a method for producing a water separator, a support structure surrounding annularly a longitudinal axis and a hydrophobic screen fabric are provided. By ultrasound or by laser radiation, a material of the support structure is plastified in regions that are radially outward at the support structure in relation to the longitudinal axis to generate plastified regions. The hydrophobic screen fabric is arranged at an outer circumferential side at the support structure and the hydrophobic screen fabric is pressed into the plastified regions. A water separator is provided that has a support structure surrounding annularly a longitudinal axis and a hydrophobic screen fabric of a material that is transparent for a laser radiation. The hydrophobic screen fabric is arranged at an outer circumferential side at the support structure and has sections embedded in radially outwardly positioned regions of the support structure.

Abstract: A filter element has a first follower element with a first traction surface and a second follower element with a second traction surface provided for interacting with first and second mating surfaces of the filter housing, respectively. The first and second traction surfaces interact with the first and second mating surfaces to pull out the filter element from the filter housing. The first and second traction surfaces are spaced apart from each other along a longitudinal axis of the filter element and project radially into the interior of the filter element. At least one of the first and second follower elements has a stop surface adjoining circumferentially the respective traction surface. In a position of use, the stop surface interacts with a counter stop surface of the filter housing to form an at least unidirectional rotational degree of freedom blocking about the longitudinal axis relative to the filter housing.

Abstract: A filter element has a first follower element with a first traction surface and a second follower element with a second traction surface provided for interacting with first and second mating surfaces of the filter housing, respectively. The first and second traction surfaces interact with the first and second mating surfaces to pull out the filter element from the filter housing. The first and second traction surfaces are spaced apart from each other along a longitudinal axis of the filter element and project radially into the interior of the filter element. At least one of the first and second follower elements has a stop surface adjoining circumferentially the respective traction surface. In a position of use, the stop surface interacts with a counter stop surface of the filter housing to form an at least unidirectional rotational degree of freedom blocking about the longitudinal axis relative to the filter housing.

Abstract: A filter element for liquid filtration has a hollow-cylindrical filter medium body and an end disk covering an end face of the filter medium body. A central cutout axially penetrates the end disk. An outflow channel for liquid to be filtered or filtered liquid is arranged at the end disk and connects to a liquid collecting space. The outflow channel extends from a radially outward wall surface of the filter medium body to the central cutout of the end disk. The outflow channel is controlled by a drainage device. A filter device with a filter housing provided with such a filter element has a drainage device that controls the outflow channel. A filter device with a drainage device having a first drainage position for draining only water and a second drainage position draining water from a water collecting space and liquid from a liquid collecting space is provided.

Abstract: In a method for producing a water separator, a support structure surrounding annularly a longitudinal axis and a hydrophobic screen fabric are provided. By ultrasound or by laser radiation, a material of the support structure is plastified in regions that are radially outward at the support structure in relation to the longitudinal axis to generate plastified regions. The hydrophobic screen fabric is arranged at an outer circumferential side at the support structure and the hydrophobic screen fabric is pressed into the plastified regions. A water separator is provided that has a support structure surrounding annularly a longitudinal axis and a hydrophobic screen fabric of a material that is transparent for a laser radiation. The hydrophobic screen fabric is arranged at an outer circumferential side at the support structure and has sections embedded in radially outwardly positioned regions of the support structure.

Abstract: A recirculation module for a fuel prefilter unit of a combustion engine has a temperature-controlled actuating element that transfers the recirculation module, based on a filter raw side feed temperature of the fuel, from a cold start state into a normal operating state and back. In cold start state, an engine return line from the combustion engine to the recirculation module is in fluid communication with a filter element raw side of the fuel prefilter unit and the engine return line is separated in regard to fluid communication from a tank return line of the combustion engine. In normal operating state, the engine return line is separated in regard to fluid communication from the filter element raw side and is in fluid communication with the tank return line. A check valve prevents return flow of fuel from the tank return line into the engine return line.

Abstract: A discharge control device for a filter system and a filter system for filtering a media flow of a first and a second medium is provided with a collecting chamber that collects the second medium separated from the media flow. A sensor arrangement with a first sensor unit, a second sensor unit, a first shut-off valve having a closure body, and a second shut-off valve is provided. The first sensor unit is operatively connected to the first shut-off valve. The first sensor unit has a float that purely mechanically actuates the closure body of the first shut-off valve. The second shut-off valve is arranged in series in flow communication with the first shut-off valve. The second shut-off valve has an electromagnetically actuatable valve controlled by the second sensor unit as a function of a fill level of second medium in the collecting chamber.

Abstract: An intermediate cover of a filter housing of a filter for purifying liquids can be mounted in the filter housing for separating a filter receiving space for a filter insert from a centrifuge receiving space for a centrifuge separator by a rotary and/or insertion movement relative to an imaginary axis. The intermediate cover is provided with a portion of at least one clean fluid channel forming a fluidic connection between a clean fluid side of the filter insert and a fluid outlet of the filter housing for a purified clean fluid. The filter insert has a connecting device arranged at an axial end face and connectable to the intermediate cover. An outlet opening for purified clean fluid is arranged at the axial end face and corresponds with an inlet opening of the clean fluid channel of the intermediate cover. The outlet opening at least partially forms the connecting device.

Abstract: A filter element has a first follower element with a first traction surface and a second follower element with a second traction surface provided for interacting with first and second mating surfaces of the filter housing, respectively. The first and second traction surfaces interact with the first and second mating surfaces to pull out the filter element from the filter housing. The first and second traction surfaces are spaced apart from each other along a longitudinal axis of the filter element and project radially into the interior of the filter element. At least one of the first and second follower elements has a stop surface adjoining circumferentially the respective traction surface. In a position of use, the stop surface interacts with a counter stop surface of the filter housing to form an at least unidirectional rotational degree of freedom blocking about the longitudinal axis relative to the filter housing.

Abstract: A water separation element is provided with a cylindrical woven fabric screen for separating water. The woven fabric screen is made of woven fabric yarns positioned angularly relative to each other. A first annular support piece is arranged at a first end face of the woven fabric screen and is fixedly connected to a rim area of the woven fabric screen. The first annular support piece has a lateral edge facing the woven fabric screen. The woven fabric screen is flowed through in radial direction. The woven fabric yarns of the woven fabric screen are positioned, at least over sections, at an angle greater than 0° and smaller than 90° relative to the facing lateral edge of the first annular support piece. A second annular support piece is connected to the second end face. A filter element and a filter device with such a water separation element are provided.

Abstract: A recirculation module for a fuel prefilter unit of a combustion engine has a temperature-controlled actuating element that transfers the recirculation module, based on a filter raw side feed temperature of the fuel, from a cold start state into a normal operating state and back. In cold start state, an engine return line from the combustion engine to the recirculation module is in fluid communication with a filter element raw side of the fuel prefilter unit and the engine return line is separated in regard to fluid communication from a tank return line of the combustion engine. In normal operating state, the engine return line is separated in regard to fluid communication from the filter element raw side and is in fluid communication with the tank return line. A check valve prevents return flow of fuel from the tank return line into the engine return line.

Abstract: A fuel filter insert for a fuel filter has a low-pressure region with prefilter element arranged therein. A high-pressure region arranged fluidically downstream of the low-pressure region has a main filter element arranged therein. Prefilter element and main filter element are arranged one atop the other axially in the fuel filter insert. A wall element projects away from the main filter element in axial direction and extends at least partially through the prefilter element. Low-pressure region and high-pressure region at least over sections thereof are separated from each other by the wall element. A fuel filter is provided with a filter housing in which the fuel filter insert is arranged. The filter housing has a fuel outlet and a fuel inlet for fuel prefiltered by the prefilter element. Fuel inlet and fuel outlet are fluidically positioned between low-pressure region and high-pressure region and a fuel pump is connectable thereto.

Abstract: A fuel filter insert for a fuel filter is provided with a prefilter element and a main filter element which are arranged one atop the other in an axial direction relative to a longitudinal axis of the fuel filter insert. The main filter element has a water separating unit configured to separate water contained in a fuel to be filtered. The water separating unit has a water discharge channel for water separated from the fuel, wherein the water discharge channel is extending in the axial direction at least partially through the prefilter element. A fuel filter with such a fuel filter insert has a filter housing accommodating the fuel filter insert and the water discharge channel of the fuel filter insert is fluidically connected with a water collecting chamber of the filter housing.

Abstract: A discharge control device for a filter system and a filter system for filtering a media flow of a first and a second medium is provided with a collecting chamber that collects the second medium separated from the media flow. A sensor arrangement with a first sensor unit, a second sensor unit, a first shut-off valve having a closure body, and a second shut-off valve is provided. The first sensor unit is operatively connected to the first shut-off valve. The first sensor unit has a float that purely mechanically actuates the closure body of the first shut-off valve. The second shut-off valve is arranged in series in flow communication with the first shut-off valve. The second shut-off valve has an electromagnetically actuatable valve controlled by the second sensor unit as a function of a fill level of second medium in the collecting chamber.

Abstract: A fuel filter has a filter housing and a fuel filter insert exchangeably arranged in the filter housing and provided with a prefilter element and a main filter element. Prefilter element and main filter element are positioned one behind the other in the filter housing in axial direction of the filter housing. A fuel discharge channel is arranged in the filter housing below the fuel filter insert. In operating position of the fuel filter insert in the filter housing, the raw sides of prefilter element and of main filter element are sealed relative to the fuel discharge channel by seal-tight contact of the fuel filter insert on the filter housing. The raw side of the main filter element, when the fuel filter insert is moved by axial movement away from the operating position, is fluidically connected with the fuel discharge channel via the raw side of the prefilter element.

Abstract: A filter element for liquid filtration has a hollow-cylindrical filter medium body and an end disk covering an end face of the filter medium body. A central cutout axially penetrates the end disk. An outflow channel for liquid to be filtered or filtered liquid is arranged at the end disk and connects to a liquid collecting space. The outflow channel extends from a radially outward wall surface of the filter medium body to the central cutout of the end disk. The outflow channel is controlled by a drainage device. A filter device with a filter housing provided with such a filter element has a drainage device that controls the outflow channel. A filter device with a drainage device having a first drainage position for draining only water and a second drainage position draining water from a water collecting space and liquid from a liquid collecting space is provided.

Abstract: A cleaning module (10) for cleaning a media flow of a first medium contaminated with a second medium that has a housing (12) having an inlet (18) and an outlet (20, 21) and a replaceable filter element (30) arranged within the housing (12). In this arrangement, a flow direction (32) of the media flow is directed through the filter element (30) in the specified installed state against the force of gravity. The filter element (30) has an absorptive and/or adsorptive material (34) for picking up at least a portion of the second medium in the first medium. A filter element for the cleaning module (10) and a filter system (100) having the cleaning module (10) are disclosed.

Abstract: A water separator for water contained in fuel or oil, including: a water outlet for the water separated from the fuel or oil; and a water discharge device having an inlet opening; and an outlet opening for the water conveyed out of the water separator; wherein the inlet opening is eccentric to a longitudinal axis of the water separator; wherein an axial direction is a direction parallel to the longitudinal axis and a radial direction is a direction traverse to the longitudinal axis; wherein the inlet opening is arranged on the water separator and spaced axially away from the water outlet; and wherein the outlet opening is arranged on the water separator coaxially to the longitudinal axis of the water separator.