# US 2018/0008913 A1 · System for filtering fluids > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0008913 A1 - Document ID: US20180008913A1 - Status: Published application - Kind: A1 - Application number: 15/545,403 - Filed: 2016-02-24 - Published: 2018-01-11 - Earliest claimed: 2015-03-05 - Assignees: Hydac Process Technology GmbH - Applicants: Hydac Process Technology GmbH - Inventors: Markus BREINIG; Sebastian HRIN; Hans-Juergen LINGEN - Web page: https://patentgrep.com/patent/US20180008913A1 ## CPC - B01D 29/665: {by using pistons} - B01D 29/52: in parallel connection - B01D 29/56: in series connection - B01D 29/668: {with valves, e.g. rotating valves for coaxially placed filtering elements} - B01D 2201/08: Regeneration of the filter - B01D 2201/16: Valves - 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) ## Abstract Disclosed is a system for filtering fluids comprising a primary filter (2) having at least one filter element that can be penetrated in one direction during the filtration process and can he penetrated in the opposite direction for a backflushing process, further comprising an aftertreatment device (36) which is mounted downstream of the priniaty filter (2) in order for the backflushed quantities discharged by the primary filter to be processed and which includes at least one filter chamber (11) that holds the backflushed quantities and has a fluid inlet, a fluid outlet and at least one aftertreatment filter element (19), and comprising a control device (9) for delivering one portion of the backflushed quantity at a time to the associated aftertreatment filter element (19). ## Claims ### Claim 1 A system for filtering fluids, comprising a primary filter (2) that is provided with at least one filter element that allows flow-through in one direction during the filtration process, and allows flow-through in the opposite direction for a backflushing process, further comprising a post-treatment device (36), which is disposed downstream of the primary filter (2) for the treatment of the backflush volumes that are discharged from said primary filter, wherein said post-treatment device is provided with at least one filter chamber (11) that takes up the backflush volumes and is provided with a fluid inlet and a fluid outlet and with at least one post-treatment filter element (19), and a control device (9) for the batchwise supply of the respective backflush volume to the associated post-treatment filter element (19). ### Claim 2 (depends on 1) The system according to claim 1, characterised in that the control device comprises a control chamber (9) with a first (51) and a second fluid compartment (53), of which the first (51) serves to receive the respective backflush volume and where a compressed gas, in particular in form of compressed air, is applied to the second fluid compartment (53) at a predetermined working pressure. ### Claim 3 (depends on 1) The system according to claim 1, characterised in that the first (51) and the second fluid compartment (53) of the control chamber (9) are separated by a separating piston (43). ### Claim 4 (depends on 1) The system according to claim 1, characterised in that a valve control system (65), in particular in form of an electrically controllable 3/2-way valve (67), which has a compressed gas connection to the second fluid compartment (53) of the control chamber (9), is provided for the supply and discharge of the compressed gas into and out of the second fluid compartment (53) of the control chamber (9). ### Claim 5 (depends on 1) The system according to claim 1, characterised in that the first fluid compartment (51) of the control chamber (9) has a permanent fluid connection to the unfiltrate side (17; 44) of the respective filter element (19) within the filter chamber (11), and that the filtrate side (17; 25), which is separated via the respective filter element (19) from its unfiltrate side (17; 44), has at least sometimes a fluid connection to the fluid outlet (5). ### Claim 6 (depends on 1) The system according to claim 1, characterised in that a further valve control device is connected between the filtrate side of the respective filter element (19) within the filter chamber (11) and the fluid outlet (5) into the respective fluid connection, in particular in form of a preferably spring-loaded non-return valve (29). ### Claim 7 (depends on 1) The system according to claim 1, characterised in that a further third valve control device (7; 34) is present on the side of the fluid inlet (3), which controls the intake of the respective backflush volume coming from the primary filter (2) and into the post-treatment device (36). ### Claim 8 (depends on 1) The system according to claim 1, characterised in that, seen in fluid flow direction, the control chamber (9) is disposed upstream of the filter chamber (11) with the respective filter element (19) or that the filter chamber (11) with the respective filter element (19) is disposed concentric to the control chamber (9) and encloses the same. ### Claim 9 (depends on 1) The system according to claim 1, characterised in that an energy store, preferably in form of a tension spring (59), is attached to the separating piston (43), and that the energy store passes through the second fluid compartment (53) of the control chamber (9). ### Claim 10 (depends on 1) The system according to claim 1, characterised in that the post-treatment device (36) is provided with a connector (1), which may be connected to the primary filter (2), wherein said connector is provided with a fluid inlet (3) for backflush volumes and a fluid outlet (5) for post-treated backflush volumes, wherein the connector acts as a support for the control chamber (11) and for two of its associated filter chambers (11), which are disposed on either side of the control chamber (9) in such a way that, within the connector (1), the first fluid compartment (51) of the control chamber (9) is permanently connected to the unfiltrate side (44) of each of the filter chambers (11), and the filtrate sides (17) of which are at least sometimes connected to the fluid outlet (5) inside the connector (1). ### Claim 11 (depends on 1) The system according to claim 1, characterised in that a heating device (81) and/or an electronic pressure and/or temperature measuring device (83) is/are disposed at least in the fluid connection area (13) between the control chamber (9) and the respective filter chamber (11). ### Claim 12 (depends on 1) The system according to claim 1, characterised in that the post-treatment device (36) is connected to the primary filter (2) such that the fluid quantity accrued at the fluid outlet (5) of the post-treatment device (36) may be recirculated to the unfiltrate side of the primary filter (2), thus forming a closed circuit. ### Claim 13 (depends on 1) A post-treatment device, in particular as component of the system according to claim 1, comprising a connector (1) that may have a fluid connection with a primary filter (2) that releases backflush volumes of flushing oil and can be reverse-flushed, with at least one filter chamber (11) and at least one filter element (19) located at the connector (1), and a control device (9) for the batchwise supply of the respective backflush volumes to the associated filter element (19). ### Claim 14 (depends on 13) The post-treatment device according to claim 13, characterised in that the control device comprises a control chamber (9) with a separating piston (43) that subdivides the control chamber (9) into a first (51) and a second fluid compartment (53), of which the first (51) serves to receive the respective backflush volume and where a compressed gas, in particular in form of compressed air, is applied to the second fluid compartment (53) at a predetermined working pressure.