Abstract: A filter cartridge (20) having an upper disc (22) joined to an upper end of a tubular filter medium (21) is positioned within a casing (11) having an upper closure cover (12). First coupling elements (31) joined to the cover (12) and second coupling elements (41) joined to the upper disc (22) project axially towards each another to achieve mutual snap-coupling. The first coupling elements (31) include axially-extending coupling teeth elastic in a radial direction, and the second coupling elements (41) include a cylindrical surface divided into identical sectors equal to the number of teeth (31), each sector includes a coupling region (43) for snap-engaging the coupling teeth (31) axially, and a disengagement region (44), positioned to the side of the coupling region (43), for releasing the coupling teeth (31) from their engagement with the coupling region (43) by rotating the cartridge (20) through a small angle relative to the upper cover (12).

Abstract: Fuel filter for diesel engines with high pressure direct injection of common rail type and the like, comprising an outer casing provided with a fuel inlet conduit (3) and an outlet conduit (4), and containing in its interior a filter means(5), a temperature sensor(15) being positioned in proximity to the bottom of said casing to measure the temperature of the fuel present in the casing.

Abstract: Base for an internal combustion engine filter cartridge, intended to receive s a filter cartridge (3) provided with apertures for the entry of the oil to be filtered and for the exit of the filtered oil, in a respective upwardly facing matching engagement seat (2) provided with oil feed and discharge. channels to be connected to the matching channels of said cartridge, with said seat—there being peripherally associated a salient enveloping element (33) with which it forms an oil spill protection compartment, from the bottom of which there extends a recovery conduit (6) connected to a collection site and intercepted by a check valve (66), the closed or open state of which depends on whether the cartridge and seat are mutually engaged or disengaged respectively.

Abstract: Fuel filter comprising a cup shaped outer casing provided in its wall with a fuel exit conduit, and closed by an electrically conductive cover connected to earth and provided with an axial fuel feed conduit with which a filter cartridge of toroidal form is associated coaxial to said axial conduit and is sealedly mounted thereon, said cover presenting an axial hole to sealedly receive a glow plug which extends into the interior of the filter cartridge, said plug comprising an outer sheath in contact with the cover and an axial stem insulated from said outer sheath and arranged to be connected to a power cable, between said outer sheath and said stem there being provided an electrical resistance element powered by said cable via temperature control means.

Abstract: The device is applicable to a vehicle which comprises: a fuel filter (3) having a filtering means (31) for filtering the fuel entering the filter (3) and for separating the water present therein, and a collection chamber (32) for the separated water; a fuel reservoir (2) having a capacity adequate for the vehicle circulation; means (52) for transferring fuel from that region of the filter (3) lying downstream of the filtering means (31) to the engine feed means (5); means (41,42) for feeding fuel from the resevoir (2) to the inlet (34a) of the filter (3) at a greater rate than the maximun flow rate transferred from the filter (3) to he feed means (5). The device comprises a second collection chamber (15) for the separated water and second means (20, 21) for tranferring liquid from the first collection chamber (32) to the second collection chamber (15) at the residual flow rate between that entering the filter (3) and that tranferred to the feed means (5).

Abstract: A fuel filter (1) comprising a cup shaped outer casing (2) provided in its wall with a fuel exit conduit (21), and closed by a cover provide with an axial fuel feed conduit (41) with which a filter cartridge (3) of toroidal form is associated coaxial to said axial conduit and is sealedly mounted thereon; an elongate container (5) containing a substance able to develop an exothermic reaction is provided in the cavity of the filter cartridge.

Abstract: The unit includes a sensor means (20) positioned in the collection chamber to undergo activation when the water level reaches a predetermined maximum value; there is also provided an electrically operated withdrawal device (30) connected to the vehicle electrical system, to withdraw the water separated within the collection chamber through the bleed outlet, or to close the outlet; a microprocessor (40) is also provided, connected to the sensor (20) and to the switch (50) of the vehicle electrical power system, to electrically power the withdrawal device (30) when the sensor (20) is activated and the ignition key is in a first activation position (I).

Abstract: The filter comprises an outer casing (11), an upper closure cover (12), and a filter cartridge (20) having a tubular filter medium (21) positioned inside the inner chamber (13), to separate the filter inner chamber (13) into a first region communicating with the inlet and a second region communicating with the outlet, and an upper disc (22) joined to the upper end of the filter medium (21). First coupling elements (31) joined to the cover (12) and projecting axially towards the interior of the chamber (13), and second coupling elements (41) joined to the upper disc (22) and projecting axially towards the upper cover (12), are provided to act together to achieve mutual snap-coupling.

Abstract: An automatic bleed unit for a fuel filter used particularly in diesel engines includes a filter chamber 5 for accumulating water present in the fuel. Sensors 220, 230 and associated floats 24, 25 are provided for determining the level of water in the chamber. Upon reaching a predetermined level, a microprocessor activates a withdrawal device 7 to drain water from the chamber. The device is only activated when the vehicle engine is at rest and the ignition key is in first switch position that makes the relevant electrical system live. A system that verifies the compatibility between the withdrawal device casing 70 and a base part 20 of the sensing system can also be included.

Abstract: An automatic bleed unit for a fuel filter typically for diesel engines, comprises sensor means (220, 230) associated with the chamber (5) of the filter (1) where the water present in the fuel accumulates, a withdrawal device (7) provided for discharging said water when this reaches a predetermined level and a microprocessor (14) connected to said sensor means and to said withdrawal device such as to activate this latter, with the vehicle engine at rest and the relative electrical system live. Said sensor means comprises a differential level reading and monitoring system comprising two measurement members, each sensitive to a level between said predetermined level and the depth of said accumulation chamber and is connected to said microprocessor.

Abstract: A filter medium is formed by preparing a pH 3-5 aqueous suspension of cellulose fibers in a pulper or beater with a concentration of between 3% and 5%. A pH 2.8-3.8 aqueous suspension of glass fibers is prepared in a pulper or beater with a fiber concentration of between 0.5% and 1.2%. A first pulp consisting exclusively of cellulose fibers is prepared, to which a moisture-resistant resin is added. A second pulp is prepared consisting of cellulose fibers and glass fibers in proportions of between 30% and 70%, to which a moisture-resistant resin is added. Two superposed layers of the pulps are formed by methods used in paper manufacture. The two layers are collected on a layer of material able to absorb water. The two superposed layers of pulp are pressed to a pressure of between 0.1 and 1 kg/cm2. The resultant sheet is dried to a moisture content of 1%. The dried material is impregnated with a 50 wt % solution of acrylic latex, and dried again. The dried material is then wound on a reel.

Abstract: A process for manufacturing a filter medium includes preparing a pH 3-5 aqueous suspension of cellulose fibers in a pulper or beater with a concentration of between 3% and 5%. A pH 2.8-3.8 aqueous suspension of glass fibers is prepared in a pulper or beater with a fiber concentration of between 0.5% and 1.2%. A first pulp consisting exclusively of cellulose fibers is prepared, to which a moisture-resistant resin is added. A second pulp is prepared consisting of cellulose fibers and glass fibers in proportions of between 30% and 70%, to which a moisture-resistant resin is added. Two superposed layers of the pulps are formed by methods used in paper manufacture. The two layers are collected on a layer of material able to absorb water. The two superposed layers of pulp are pressed to a pressure of between 0.1 and 1 kg/cm.sup.2. The resultant sheet is dried to a moisture content of 1%. The dried material is impregnated with a 50 wt % solution of acrylic latex, and dried again.

Abstract: A fuel filter comprising a container, a filter cartridge coaxially disposed within said container and defining therebetween a first chamber having an upper portion disposed above the filter cartridge, a lower portion surrounding the lateral surface of the filter cartridge, a second chamber disposed within the filter cartridge and a third chamber disposed below the filter cartridge, an inclined surface disposed in the upper portion of the first chamber, fuel inlet means for introducing fuel to the upper portion of the first chamber, said fuel descending along said inclined surface for initial separation of water from the fuel before passing to the lower portion of the first chamber and through the lateral surface of said filter cartridge into said second chamber, outlet means communicating with the second chamber within the filter cartridge, means for closing the ends of the cartridge so that the only passageway between the first chamber and the second chamber is through the lateral surface of the filter cartr

Abstract: A disposable oil filter unit with triple filtration characterized by comprising, within a closed cup-shaped container (1), two filter cartridges (3) and (2) which filter radially from the outside towards the center and are disposed in parallel with regard to the traversing oil flow, and of which the first filter cartridge (3), which is of finer porosity, is surrounded by a third concentric cartridge (33) disposed in series with filter cartridge and having a coarser porosity than the second cartridge.