Abstract: In a fluid filter with a housing and a filter element replaceably located in said housing, and with a filter by pads valve having a valve body held in the housing that is movable against the action of a spring from the closed position in which it cooperates with a sealing surface, into an open position in which it permits a fluid flow to bypass the filter element. The invention proposes that the sealing surface associated with the valve body be formed by the replaceable filter element.

Abstract: A liquid filter, such as an oil or gas filter, is provided which has a cup-shaped cylindrical filter housing to be mounted in a vertical orientation, with a releasable cover closing the filter housing. A liquid inlet passage and a liquid outlet passage are provided at the housing. A replaceable, substantially hollow cylindrical filter insert is vertically arranged in the housing. The filter insert being formed of a filter material member arranged between an upper and a lower disc. A collar, which is impervious to solid contaminants removed by the filter material member, extends from the lower disc upwardly along a part of the height of the filter insert, surrounding an outer circumference of the filter insert member. In this manner a collection chamber is formed for the filtered solid particles at the lower disc.

Abstract: A liquid filter, in particular for oil or fuel in an internal combustion engine, with the liquid filter comprising a filter housing with at least one liquid intake passage and at least one liquid return passage, a releasable cover which closes the filter housing liquid-tight, and an individually replaceable filter insert which can be removed from the filter housing. A hollow fastening screw is arranged centrally in the front wall of the filter housing with the front wall facing the filter connecting flange when in the mounted condition, with the fastening screw turnable in relation to the filter housing. The liquid filter may be tightly screwed to a filter connecting flange of, e.g., an internal combustion engine. A longitudinal middle axis of the filter housing and the plane of the front wall are arranged at an angle <90.degree.

Abstract: The invention relates to a filter cartridge for a filter for filtering liquid or gaseous media comprising two front disks and a substantially hollow cylindrical filter member arranged inbetween the two front disks, with the medium to be filtered flowing through the filter member, with at least one of the front disks provided with a central aperture whereby the filter cartridge is axially mountable onto a medium inlet pipe or outlet pipe with at least one seal sealingly positioned inbetween, and wherein the filter cartridge is detachable from the pipe for replacement. The filter cartridge is designed as a replacement filter cartridge for replacing common filter cartridges having metal parts, wherein the filter consists of paper and/or cotton and/or felt and/or thermally usable plastic non-woven fabric, wherein the front disks and formed of thermally consumable plastic and the seal is formed of a flexible thermally consumable material.

Abstract: A device for separating contaminants out of the lube oil of an internal combustion engine is provided which includes a filter element, a centrifuge rotatable by means of the lube oil flowing through it, and at least one supply passage for lube oil to be cleaned and at least one drain passage for the cleaned oil. The filter element and the centrifuge are arranged in a common, closable housing with at least one of the filter element and the centrifuge being removable from the housing when the housing is open. The filter element and the centrifuge are arranged in the housing in vertical alignment and a single cover covers the common housing.

Abstract: In a liquid filter comprising a filter housing having at least one liquid intake channel and at least one liquid return channel passing through a face wall of the filter housing that faces toward a filter connecting flange to which said filter housing is to be mounted, a releasable cover that closes the filter housing liquid-tight, an individually replaceable filter insert that can removed from the filter housing, and the improvement of a hollow fastening screw forming an axial liquid channel in communication with the liquid return channel and that can be rotated relative to the filter housing, the screw being centrally arranged in the face wall of the filter housing and serving to securely mount the filter housing to the filter connecting flange. Check valves can optionally be provided in the intake channel and in the hollow screw to prevent unwanted flow of liquid through the filter housing, particularly when changing the filter insert.

Abstract: A filter and associated valve are provided which are particularly useful for the purification of oil or fuel in an internal combustion engine. The filter includes a preassembled valve unit having a sealing member, an activating member and an interposed spring element formed without a housing. The sealing member and activating member penetrate each other along a part of their axial length, guiding each other and being displaceable relative to each other in an axial direction. The relative axial displaceability is limited by a stopper provided at the activating member and/or the sealing member. The preassembled valve unit is guided axially moveable in a drain conduit of the filter after insertion of the valve unit into the conduit.

Abstract: The invention relates to a filter for cleaning lubricating oil, especially for internal combustion engines of motor vehicles, with a filter case which, when installed, is in an at least approximately upright position. It has a cylinder-shaped oil filter cartridge and an inlet for the dirty oil flowing through the filter cartridge, plus an outlet for clean oil connected to the central interior part of the filter case and situated in a base at the bottom end of the filter case. A drain passage at the bottom end of the filter case becomes connected to the inlet chamber of the filter case whenever the filter cartridge is removed, plus a closure which cuts the drain passage off from the filter case.

Abstract: The invention relates to a filter for cleaning lubricating oil, especially for internal combustion engines of motor vehicles, with a filter case which, when installed, is in an at least approximately upright position. It has a cylinder-shaped oil filter cartridge and an inlet for the dirty oil flowing through the filter cartridge, plus an outlet for clean oil connected to the central interior part of the filter case and situated in a base at the bottom end of the filter case. A drain passage at the bottom end of the filter case becomes connected to the inlet chamber of the filter case whenever the filter cartridge is removed, plus a closure which cuts the drain passage off from the filter case.

Abstract: The invention relates to a fuel preheater, especially for use in diesel engines of motor vehicles, in which the fuel, as a first fluid medium, is heated by absorbing heat from a second fluid medium of higher temperature, and in which the two media are carried through the preheater in separate passages. The preheater has a core which consists substantially of a set of walls of meandering cross section which forms two groups of parallel passages opening alternately on one longitudinal side and the other longitudinal side and running between the individual walls of the set the passages of one group being all open on the same side. The core is disposed between two covers covering the open longitudinal sides of the passages.

Abstract: The invention relates to a heat exchanger for two fluid media, especially liquids, having a housing which can be closed with a cover and which has a core for separately carrying the two media under heat exchange, at least the core being able to be produced by pressure casting. The core (3) is formed essentially of a train of walls in a meandering configuration which form the passages for the two media in the form of tall, narrow chambers, while the one medium and the other flow alternately through adjacent chambers. The chambers are divided into partial chambers disposed in two planes through which the fluid flows successively, by a common partition wall (34) which divides all the chambers vertically and is integral with the train of walls.

Abstract: A heat exchanger for two fluids, especially an oil cooler for oil and water in an internal combustion engine. The heat exchanger is made up of a dividing wall having a meander-like cross section which is bounded by two side covers to form longitudinal channels and having a headering system comprising cross channels, connecting channels, feed channels, and inlet and outlet openings located at each end of the heat exchanger. The heat exchanger is of modular design so that it can be easily expanded by the connection of several heat exchanger units.