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.

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.

When air inside a filter device is purged, filtered liquid can be discharged together with air to the outside of the filter device. A casing is provided inside a tank, a filter element is provided inside the casing, and a lid is provided so as to cover the upper face of the casing and the upper face of the tank. A first through-hole is formed in the substantially center of an upper plate that covers the upper end face of a filtration member of a filter element and is abutted with the lower face of the lid; in a plan view, a second through-hole, in which a first opening being one end is disposed at a position overlapped with the first through-hole, and a second opening being the other end is disposed between the side face of the tank and the side face of the casing, is formed in the lid; and the first through-hole and the second through-hole communicate with the hollow portion of the filtration member and space that is inside the tank and outside the casing.

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.

A water purifying filter cartridge structure includes: a filter cartridge main body and a filter cartridge bottom seat. The filter cartridge main body includes: a filter barrel, a filter barrel cover, a filter body, a filter chamber, and a back flow check component. The filter barrel cover is disposed on a top portion of the filter barrel. The filter body is adapted to remove impurities from water. The filter chamber is disposed in the filter barrel, and the back flow check component is disposed in the filter barrel. The back flow check component includes a first back flow check piece, a second back flow check piece, and a third back flow check piece. The first back flow check piece and the second back flow check piece are adapted to prevent back flow at the water input end.

The present invention relates to the field of filtering, more precisely the present invention concerns an apparatus and a method for the separation of dry matter from a medium and the use of said apparatus. One embodiment discloses an apparatus for the separation of dry matter and liquid from a medium, comprising a plurality of press rollers, a separation chamber for receiving the medium and defined, in cross section, by the press rollers, and at least one chamber filter located inside and enclosed by the separation chamber. The apparatus is preferably configured such that a negative pressure can be established in said chamber filter(s) relative to the separation chamber such that liquid in the medium can be sucked into the chamber filter(s) and dry matter in the medium can pass between corresponding press roller.

Disclosed herein are disc filters for dewatering a fiber suspension. According to a first aspect, the disc filter includes a vessel comprising an inlet positioned in a wall of the vessel, the inlet introducing a fiber suspension into the vessel. The disc filter further includes a rotor shaft comprising a shaft axis of rotation positioned in a shaft plane, wherein the shaft plane is a horizontal plane. At least one filter element may be coupled to the rotor shaft. At least one injector may be positioned in the wall of the vessel, the at least one injector introducing a secondary flow of liquid into the vessel. The at least one injector may be located in the wall of the vessel at an injector elevation angle ?.sub.I that is greater than ?44 degrees and less than or equal to +22 degrees relative to the shaft plane.

There is provided a method of desanding a production flow with at least liquid and solid phases. An inlet is connected to a flow line of a sand trap body having a first filter housing defining a first bore and a plurality of second filter housings defining second bores each connected to the first filter housing at spaced intervals transverse to and in fluid communication with the first bore. The flow path between the stand trap inlet and outlet is defined by the first and second housings. A primary filter is inserted into each of the second bores, the production flow is flowed through the sand trap body such that the production flow is filtered by the primary filters, and then a secondary filter is inserted into the first bore. The mesh size of the primary filters is finer than or equal to the mesh size of the secondary filter.

An oil filter for vehicle lubrication system includes a housing forming a cavity, a filter medium mounted in the housing cavity, an inlet port located upstream of the filter medium in the direction of oil flow, a first outlet port located downstream of the filter medium. The oil filter includes a second outlet port located downstream of the filter medium.

When air inside a filter device is purged, filtered liquid can be discharged together with air to the outside of the filter device. A casing is provided inside a tank, a filter element is provided inside the casing, and a lid is provided so as to cover the upper face of the casing and the upper face of the tank. A first through-hole is formed in the substantially center of an upper plate that covers the upper end face of a filtration member of a filter element and is abutted with the lower face of the lid; in a plan view, a second through-hole, in which a first opening being one end is disposed at a position overlapped with the first through-hole, and a second opening being the other end is disposed between the side face of the tank and the side face of the casing, is formed in the lid; and the first through-hole and the second through-hole communicate with the hollow portion of the filtration member and space that is inside the tank and outside the casing.