# US 2019/0168142 A1 · Diesel fuel pre-filtering system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0168142 A1 - Document ID: US20190168142A1 - Status: Published application - Kind: A1 - Application number: 16/323,471 - Filed: 2017-07-26 - Published: 2019-06-06 - Earliest claimed: 2016-08-08 - Assignees: Mahle Metal Leve S/A; Mahle International GmbH - Applicants: Mahle Metal Leve S/A; Mahle International GmbH - Inventors: Tadeu Geraldo Domingues; Felipe Ferrari; Luiz Carlos Fritz; Fernando Junyoshino - Web page: https://patentgrep.com/patent/US20190168142A1 ## CPC - B01D 36/006: {Purge means} - B01D 27/08: Construction of the casing - B01D 27/106: {Anti-leakage or anti-return valves} - B01D 27/148: {arranged concentrically or coaxially} - B01D 36/003: {Filters in combination with devices for the removal of liquids (B01D35/185 takes precedence)} - F02M 37/24: characterised by water separating means - B01D 2201/295: with projections extending in a radial outward direction, e.g. for use as a guide, spacing means - B01D 2201/309: Housings with transparent parts - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF ## Abstract A diesel fuel pre-filtering system may include a structure for housing at least two filtering areas, a fuel inlet area, and a fuel outlet area. The system may also include an inspection window including a drain for water, a first filtering area structured to define a restriction connecting between the fuel inlet area and a subsequent filtering area, and a second filtering area structured to define a restriction connecting between a preceding filtering area and the fuel outlet area. The structure and the inspection window may be composed of a thermoplastic material distinct from each other and connected to each other via a permanent bond. ## Claims ### Claim 1 A diesel fuel pre-filtering system, comprising: a structure housing at least two filtering areas, a fuel inlet area, and a fuel outlet area; an inspection window including a drain for water; a first filtering area structured to define a restriction connecting between the fuel inlet area and a subsequent filtering area; and a second filtering area structured to define a restriction connecting between a preceding filtering area and the fuel outlet area; wherein the structure and the inspection window are composed of a thermoplastic material distinct from each other and connected to each other via a permanent bond. ### Claim 2 (depends on 1) The diesel fuel pre-filtering system according to claim 1, further comprising: an upper structure configured to position a plurality of filtering components including: a support base for a filtering component of the first filtering area of the plurality of filtering components; an empty axial extension housing a filtering component of the second filtering area of the plurality of filtering components; a base disc supporting the filtering component of the first filtering area, the base disc having a distal peripheral area welded to an internal wall of the structure; and an empty structure arranged between the filtering component of the first filtering area and the filtering component of the second filtering area, the empty structure including a plurality of radial projections disposed at ends of the empty structure, a first radial projection of the plurality of radial projections arranged between an outer wall of the empty axial extension and an internal surface of the filtering component of the first filtering area. ### Claim 3 (depends on 1) The diesel fuel pre-filtering system according to claim 1, wherein the fuel outlet area is defined by a threaded bore structured and arranged to connect a fuel inlet line to a motor, the threaded bore including a concentric pin configured to actuate a retention valve arranged at an entry to the fuel inlet line, the pin incorporated in the diesel fuel pre-filtering system. ### Claim 4 (depends on 2) The diesel fuel pre-filtering system according to claim 2, wherein the base disc includes a plurality of sloped annular retention projections, angled in a direction of the inspection window. ### Claim 5 (depends on 1) The diesel fuel pre-filtering system according to claim 1, wherein a filtering component of the second filtering area is defined by a hydrophobic membrane. ### Claim 6 (depends on 1) The diesel fuel pre-filtering system according to claim 1, further comprising a relief hole with a calibrated capillary permitting only passage of gases. ### Claim 7 (depends on 1) The diesel fuel pre-filtering system according to claim 1, further comprising: a spacer ring arranged between the structure and an upper structure configured to position a plurality of filtering components; and a sealing ring disposed between the at least two filtering areas, set in relation to the structure, the upper structure, and the spacer ring. ### Claim 8 (depends on 1) The diesel fuel pre-filtering system according to claim 1, wherein the permanent bond is a weld. ### Claim 9 (depends on 8) The diesel fuel pre-filtering system according to claim 8, wherein a junction area between the structure and the inspection window includes a burr housing. ### Claim 10 (depends on 9) The diesel fuel pre-filtering system according to claim 9, wherein the burr housing is arranged in the structure and defined by an internal ring recess disposed immediately adjacent to a radial projection of the inspection window when the structure and the inspection window are connected to each other. ### Claim 11 A diesel fuel pre-filtering system, comprising: a structure housing at least two filtering areas, a fuel inlet area, and a fuel outlet area; an inspection window including a water drain; a first filtering area structured to define a restriction connecting between the fuel inlet area and a subsequent filtering area; and a second filtering area structured to define a restriction connecting between a preceding filtering area and the fuel outlet area; wherein the structure and the inspection window are composed of a thermoplastic material distinct from each other and coupled to each other via a weld disposed in a joining area including a burr housing arranged within the structure. ### Claim 12 (depends on 11) The diesel fuel pre-filtering system according to claim 11, wherein a filtering component of the second filtering area is defined by a hydrophobic membrane. ### Claim 13 (depends on 11) The diesel fuel pre-filtering system according to claim 11, further comprising a relief hole with a calibrated capillary permitting only passage of gases. ### Claim 14 (depends on 11) The diesel fuel pre-filtering system according to claim 11, wherein the fuel outlet area is defined by a threaded bore structured and arranged to connect a fuel inlet line to a motor, the threaded bore including a concentric pin configured to actuate a retention valve arranged at an entry to the fuel inlet line. ### Claim 15 (depends on 11) The diesel fuel pre-filtering system according to claim 11, further comprising: a spacer ring arranged between the structure and an upper structure configured to position a plurality of filtering components; and a sealing ring disposed between the at least two filtering areas providing a fluidically seal between the fuel inlet area and the first filtering area, the sealing ring arranged in contact with the structure, the upper structure, and the spacer ring. ### Claim 16 A diesel fuel pre-filtering system, comprising: a structure housing a plurality of filtering areas, a fuel inlet area, and a fuel outlet area; an inspection window including a water drain; a first filtering area of the plurality of filtering areas defining a restriction connecting between the fuel inlet area and a subsequent filtering area of the plurality of filtering areas; a second filtering area of the plurality of filtering areas defining a restriction connecting between a preceding filtering area of the plurality of filtering areas and the fuel outlet area; and a plurality of filtering components including a first filtering component and a second filtering component, the first filtering component fluidically connected to the first filtering area and the second filtering component fluidically connected to the second filtering area; wherein the structure and the inspection window are composed of a thermoplastic material distinct from each other and connected to each other via a permanent bond. ### Claim 17 (depends on 16) The diesel fuel pre-filtering system according to claim 16, further comprising: an upper support configured to position the plurality of filtering components, the upper support including a support base supporting the first filtering component; and a base disc having a distal peripheral area welded to an internal wall of the structure, the base disc fluidically sealing the inlet area from an external surface of the first filtering component. ### Claim 18 (depends on 16) The diesel fuel pre-filtering system according to claim 16, wherein the fuel outlet area is defined by a threaded bore structured and arranged to connect a fuel inlet line to a motor, the threaded bore including a concentric pin configured to actuate a retention valve arranged at an entry to the fuel inlet line. ### Claim 19 (depends on 16) The diesel fuel pre-filtering system according to claim 16, further comprising a joining area disposed between the structure and the inspection window, wherein the permanent bond is a weld disposed in the joining area, and wherein the joining area includes a burr housing structured and arranged to accommodate at least one of melted material and a plurality of burrs. ### Claim 20 (depends on 19) The diesel fuel pre-filtering system according to claim 19, wherein the burr housing is defined by a recess of the structure arranged directly adjacent to a radial projection of the inspection window.