A filter module for a filter assembly has a primary filter element and a secondary filter element. A water separation interface is provided for discharging water, which has been separated by the primary filter element from a fluid to be filtered, from the primary filter element. A primary filter interface is provided for discharging fluid, which has been filtered by the primary filter element, from the primary filter element. A secondary filter interface is provided for discharging the fluid, which has been filtered by the secondary filter element, from the secondary filter element. The water separation interface, the primary filter interface, and the secondary filter interface are arranged coaxially to a symmetry axis of the filter module. The water separation interface, the primary filter interface, and the secondary filter interface are each designed for outflow of material flows in axial direction of the symmetry axis.

A filter module for a filter assembly has a primary filter element and a secondary filter element. A water separation interface is provided for discharging water, which has been separated by the primary filter element from a fluid to be filtered, from the primary filter element. A primary filter interface is provided for discharging fluid, which has been filtered by the primary filter element, from the primary filter element. A secondary filter interface is provided for discharging the fluid, which has been filtered by the secondary filter element, from the secondary filter element. The water separation interface, the primary filter interface, and the secondary filter interface are arranged coaxially to a symmetry axis of the filter module. The water separation interface, the primary filter interface, and the secondary filter interface are each designed for outflow of material flows in axial direction of the symmetry axis.

A filter device may include a filter housing and a filter element defining a longitudinal axis disposed in the filter housing. The filter element may be configured to be penetrated by a fluid flow in a radial direction from a raw end to a pure end of the filter element. A water separator may be disposed at the pure end of the filter element and arranged axially spaced from the same. The water separator may have a hydrophobic and annular diaphragm extending in an axial direction of the filter element configured to be penetrated by the fluid flow from a raw end of the water separator in a radially outward to a radially inward direction with respect to the longitudinal axis to separate water from the fluid flow.

A filter device may include a filter housing and a filter element defining a longitudinal axis disposed in the filter housing. The filter element may be configured to be penetrated by a fluid flow in a radial direction from a raw end to a pure end of the filter element. A water separator may be disposed at the pure end of the filter element and arranged axially spaced from the same. The water separator may have a hydrophobic and annular diaphragm extending in an axial direction of the filter element configured to be penetrated by the fluid flow from a raw end of the water separator in a radially outward to a radially inward direction with respect to the longitudinal axis to separate water from the fluid flow.

A center tube for use with a filter element comprises a unitary body having a standpipe that defines a length along the longitudinal axis and a central flow passage and a plurality of radially extending flow fins attached to the standpipe, the flow fins spaced axially from one another along the standpipe to define radial flow channels, wherein each of the fins further defines a first aperture between the fin and the standpipe, the apertures together defining a first outer axial flow passage and the standpipe defines a a rectangular shape.

A separating device for separating an undesired fluid from a multi-component liquid has a region flowed through by the multi-component liquid and at least one membrane disposed in the region to separate a first fluid region from a second fluid region. The membrane has a first permeability to the undesired fluid and a second permeability to the multi-component liquid. The first permeability is different from the second permeability. The membrane is equally permeable to all components of the multi-component liquid. The membrane is permeable to the multi-component liquid and impermeable to the undesired fluid, or the membrane is impermeable to the multi-component liquid and is permeable to the undesired fluid, wherein the multi-component liquid is a liquid multi-component operating medium. A filter with such a separating device and a filter element, in particular for diesel fuel, as well as a liquid system with such a separating device are described.

A filter assembly that comprises a housing, an outer filter element, and an inner filter element. The outer filter element is positionable within the housing and comprises an outer filter media. The inner filter element is positionable within the outer filter element and comprises an inner filter media, a media support structure, an inner top endplate, and an inner bottom endplate. The inner top endplate comprising a top rib that extends continuously around a portion of a top surface of the inner top endplate.

The invention relates to a drainage connector (1) having a cup-shaped housing (2) which comprises a housing base (3) and a housing wall (4). A connection geometry (5) is arranged on the outside on the housing wall (4) for inserting into a container opening, wherein an inlet pipe (9) of an inlet side (7) is guided to an outlet side (8) through the housing base (3) and an annular collecting chamber (10) is formed between the inlet pipe (9) and the housing wall (4). In order to discharge denser fluid which can accumulate in the collecting chamber, the housing (2) has a discharge channel (11), which leads from the collecting chamber (10) to the outlet side (8) and can be closed from the outlet side (8). The drainage connector is intended to be producible in a cost-effective manner at low cost and to have a low mass. For this purpose, the inlet pipe (9) on the outlet side (8) merges into an outlet pipe (13) which has a closing element (16) that can be moved between an open position and a closed position, wherein the housing (2) comprising the connection geometry (5), the inlet pipe (9) and the outlet pipe (13) is formed from plastic as a single piece.

A diesel fuel filter for removing foreign substances and water contained in fuel used in a high-pressure fuel pump upon lubricating and cooling the high-pressure fuel pump is provided. The diesel fuel filter includes a lower cap for draining water including a double-lock cover and a double-lock pin to provide a double-lock structure to prevent fuel leakage caused by unfastening of the lower cap due to impact or vibration during driving of a vehicle.

Disclosed are systems, methods, and algorithms for monitoring and indicating filter life. In particular, the disclosed systems, methods, and algorithms may be utilized for monitoring and indicating the useful life of a filter in an internal combustion engine.