EP1113854A1 - Cartouche filtrante - Google Patents

Cartouche filtrante

Info

Publication number
EP1113854A1
EP1113854A1 EP99931258A EP99931258A EP1113854A1 EP 1113854 A1 EP1113854 A1 EP 1113854A1 EP 99931258 A EP99931258 A EP 99931258A EP 99931258 A EP99931258 A EP 99931258A EP 1113854 A1 EP1113854 A1 EP 1113854A1
Authority
EP
European Patent Office
Prior art keywords
valve
filter insert
insert according
guide
valve guide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99931258A
Other languages
German (de)
English (en)
Inventor
Wolfgang Assmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Argo Hytos GmbH
Original Assignee
Argo GmbH fuer Fluidtechnik
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Argo GmbH fuer Fluidtechnik filed Critical Argo GmbH fuer Fluidtechnik
Publication of EP1113854A1 publication Critical patent/EP1113854A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
    • B01D35/147—Bypass or safety valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/24—Tools used for the removal of filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/29—Filter cartridge constructions
    • B01D2201/291—End caps

Definitions

  • the present invention relates to a filter insert with a jacket having filter material for filtering a fluid, an end wall which closes the jacket on an upper side and has a through opening, and with a bypass valve for opening and closing the through opening, the bypass valve being a valve housing made of plastic, which receives a valve body and a valve spring loading the valve body in the direction of a valve seat.
  • Filter inserts of this type are used, for example, for filtering mineral oils in hydraulic systems. With increasing operating time, impurities are deposited in the filter material, so that its flow resistance increases. To avoid that fluid can no longer flow through when the filter material is clogged and the supply to the hydraulic system or an internal combustion engine, for example, is interrupted, a bypass or bypass valve is provided on the filter insert, which enables a flow connection through the filter insert without this Fluid is filtered if the filter material has a high flow resistance due to impurities and therefore a relatively high pressure difference builds up on the filter material in the direction of flow. If there is a fixed pressure difference, the bypass valve releases the through opening arranged on the end wall, so that the fluid can bypass the filter material and flow through the through opening.
  • the bypass valve is usually designed as a spring-loaded check valve with a valve body which is arranged in a valve housing, the valve housing additionally receiving a valve spring which loads the valve body in the direction of a valve seat.
  • the valve housing is made of metal and is fixed to the end wall, which is also made of metal, by spot welding when the filter insert is installed.
  • Filter inserts of the type mentioned at the outset are also known, in which the valve housing is made of plastic. If there is a high pressure difference between the clean and the dirty side of the filter insert due to a developing flow resistance of the filter material, then the valve body separates from the valve seat, so that the fluid can flow axially through the through opening into the valve housing, and via laterally arranged The fluid can then flow out of the plastic valve housing of the bypass valve.
  • the size of the outflow openings is selected such that they allow access to the inside of the valve housing when the bypass valve is installed, so that the valve spring and the valve body pass through the outflow openings and into the valve side. housing can be used. However, this is associated with a not inconsiderable installation effort and correspondingly high manufacturing costs.
  • the object of the present invention is to develop a filter insert of the type mentioned at the outset in such a way that it is easier to assemble and less expensive to produce.
  • valve housing for guiding the valve body comprises a valve guide and in that a separate support element is provided for supporting the valve spring, the valve body and the valve spring being insertable into the valve guide for assembly and then the support element can be fixed on the valve guide.
  • the filter insert according to the invention thus uses a valve housing made of plastic with a valve guide and a separate support element, which is preferably also made of plastic.
  • the valve body and the valve spring can first be inserted into the valve guide unhindered by the support element.
  • the support element can then be fixed to the valve guide.
  • this allows the filter insert to be mounted in the axial direction, namely counter to the direction of flow of the fluid flowing through the through opening when the filter insert is used.
  • Such a configuration makes it possible, in particular, to first hold the end wall on a suitable tool holder when installing the filter insert.
  • valve guide into which the valve body and the valve spring are then inserted, can then be placed in the area of the through opening on the underside of the end wall, which preferably points upwards during the assembly process. Finally, the support element is fixed to the valve guide.
  • the jacket comprising the filter material can then be placed on the underside of the end wall and permanently connected to the end wall.
  • the valve guide preferably comprises a guide sleeve held on the end wall.
  • the support element preferably forms an approximately parallel and spaced from the end wall bottom wall of the guide sleeve.
  • An opening can be provided in the bottom wall. This opening can be designed in the form, for example as an elongated hole, that a radial fixation of the support element is made possible during valve assembly.
  • the guide sleeve is cylindrical and preferably has a plurality of outflow openings arranged in its cylinder jacket and distributed over its circumference having.
  • Such an embodiment is characterized by a relatively low flow resistance, since it is not necessary for the fluid to completely flow around the valve body when the bypass valve is open.
  • the support element can be fixed to the valve guide by means of a latching connection having at least one latching projection and a corresponding latching receptacle.
  • a latching connection having at least one latching projection and a corresponding latching receptacle.
  • the support element forms an end cap which overlaps the free end of the valve guide facing away from the end wall. Such an end cap can be easily placed on the valve guide when installing the filter insert.
  • the support element is immersed in the valve guide.
  • valve guide for inserting or fitting the support element can be elastically deformed transversely to its direction of insertion or fitting.
  • the valve guide can thus be radially expanded or inserted for the insertion or placement of the support element. be narrowed, whereupon it resumes its initial state due to its elasticity.
  • valve guide has longitudinal slots which open into the free end face of the valve guide.
  • Such longitudinal slots give the valve guide elasticity in form and enable elastic spreading or narrowing in order to be able to insert the support element into the valve guide or to place it on the valve guide with little effort.
  • catch projections and catch receptacles engaging one behind the other are arranged on the support element and on the valve guide.
  • the locking projections and locking receptacles thus form undercuts, preferably with contact surfaces aligned obliquely to the direction of expansion of the valve guide.
  • hook-like locking projections are arranged on the support element, which when inserting or when placing the support element Snap into or onto the valve guide in the corresponding snap-in receptacles and lock the valve guide transversely to the direction of insertion.
  • Both the valve guide and preferably the support element are made of plastic.
  • the end wall is also made of plastic. It is particularly advantageous here if the valve guide and the end wall are formed in one piece. In such an embodiment, the end wall and the valve guide can form a one-piece injection-molded part, the valve guide adjoining the through opening of the end wall in the flow direction.
  • the filter insert After a certain operating time, it is necessary to pull the filter insert out of an assigned filter housing.
  • the filter insert is often firmly seated in the filter housing to achieve a good seal, so that strong grip elements are necessary in order to be able to pull the filter insert out of the filter housing.
  • the end wall on its upper side facing away from the valve guide carries a handle bracket which is integrally formed with it and which is arranged adjacent to the upper side in a rest position and which can be pivoted into a handle position angled from the upper side. Due to the one-piece design of the handle and front wall, one can. separate assembly of the handlebar on the forehead wall is eliminated and it is ensured that the handle cannot be forgotten when installing the filter insert.
  • the grip bracket In its rest position, the grip bracket is particularly preferably oriented obliquely to the top of the end wall. As a result, the handle bar can easily be grasped by an operator and pivoted into its handle position.
  • a guide element which is oriented obliquely to a longitudinal axis of the filter insert, is arranged adjacent to the valve guide on the valve guide.
  • a guide element has the result that the fluid is deflected as it flows through the bypass valve such that it strikes the inside of the filter material at an angle to the longitudinal axis of the filter insert. This reduces the mechanical load on the filter material.
  • the oblique flow guidance caused by the guide element also reduces the pressure loss of the fluid as it flows through the filter insert. It is particularly expedient if the guide element is formed in one piece with the valve guide, since this allows the filter insert to be produced particularly cost-effectively.
  • valve guide in its end region adjacent to the end wall, forms a receptacle on its outside at least along a partial region of its outer circumference for engaging a fixing element that fixes the filter material in the filter insert.
  • the receptacle forms an undercut in which the fixing element can engage in such a way that a particularly strong mechanical connection of the fixing element to the guide sleeve results.
  • the fixing element can comprise, for example, an adhesive layer engaging in the receptacle.
  • an adhesive layer engaging in the receptacle for example, an epoxy resin adhesive or a polyurethane-based adhesive can be used, which connects the filter material of the jacket to the end wall and the valve guide in a fluid-tight manner.
  • the end wall preferably has a laterally pulled-down edge which surrounds the jacket in the region of the bypass valve.
  • the fluid that usually flows through a radial bore results in a particularly high mechanical load on the filter material.
  • the bypass edge is the bypass
  • the valve is surrounded by an annular space into which the filter material can be introduced, the filter material in the area of the bypass valve being given a high degree of mechanical stability against the fluid usually flowing in through a radial bore.
  • the end wall with a molded handle and molded valve guide preferably in the form of a guide sleeve, and preferably with a molded edge, can form a one-piece injection molded part.
  • further injection molded parts can be provided in the form of the valve body and the support element. It is particularly advantageous if these injection molded parts are produced in a single operation in such a way that the valve body and the support element are additionally cast in a wing shape on the end wall with a molded handle and molded valve guide.
  • a one-piece combination injection-molded part designed in this way enables particularly cost-effective production and storage and simpler logistics.
  • the wing-shaped, cast-on assembly parts in the form of the valve body and the support element can be broken off from the end wall or separated by machine.
  • the valve body can then be inserted together with a valve spring into the guide sleeve integrally connected to the end wall, and then the support element is snapped into the guide sleeve.
  • FIG. 1 shows a longitudinal section through a filter insert
  • FIG. 2 shows a diagrammatic representation of a longitudinally cut front wall used in the filter insert according to FIG. 1 with a molded handle, molded guide sleeve and laterally pulled-down sleeve-shaped edge;
  • FIG. 3 shows a view of the filter insert in the direction of arrow A in FIG. 1;
  • Fig. 4 is a sectional view taken along the line 4-4 in Fig. 1 and
  • FIG. 5 a plan view of a combination injection molded part in the form of the end wall shown in FIG. 2 with a cast-on valve plate and a cast-on support element.
  • FIG. 1 to 4 show a filter insert, which is occupied overall by reference number 10.
  • This essentially comprises a hollow cylindrical jacket 12, on the end faces of which on the one hand an end wall 14 and on the other hand an end cap 16 are arranged.
  • the jacket 12 comprises a support tube 18 which is made of metal or a plastic material and is penetrated by numerous flow bores 19 in the radial direction.
  • an essentially hollow cylindrical filter material in the form of a filter bellows 24 which is coaxial with the support tube 18 is arranged around the support tube 18.
  • This filter bellows 24 is known per se and is therefore only shown schematically in the drawing. It is folded in a star-shaped manner by folds running parallel to a longitudinal axis 26 of the filter insert 10 so that radially outer fold tips and radially inner fold bases alternately follow one another along its U start.
  • the end wall 14 comprises an annular cover plate 28 with a central circular through opening 30, to which in the axial direction of the filter insert 10 is connected a bypass valve 32, which is described in more detail below and which is arranged coaxially and at a distance from the support tube 18.
  • a bypass valve 32 which is described in more detail below and which is arranged coaxially and at a distance from the support tube 18.
  • an edge pulled down in the direction of the end cap 16 in the form of a cylindrical sleeve 34 is formed on the end plate 28 and surrounds the end region of the filter bellows 24 facing the end plate 28.
  • a semicircular handle bracket 38 is formed on the end plate 28. This is from a so-called solid line shown in FIGS. 1 and 2 position into a handle position shown in dashed lines in FIGS. 1 and 2, the pivoting movement is shown in FIG. 2 by arrow 40.
  • the handle bar 38 is integrally connected at its end regions via webs 41 and 42 to the end plate 28, while it is arranged with its remaining ring region in its rest position at a distance and obliquely to the top 36 of the end plate 28, so that it can be used by an operator at the Filter maintenance can be gripped in its rest position and pivoted into its grip position.
  • the pivotability of the handle bar 38 is ensured by film hinges 20 and 21.
  • the bypass valve 32 includes a hollow cylindrical guide sleeve 44, which is connected to the through opening 30 in the axial direction and is aligned coaxially to the longitudinal axis 26, which is connected in one piece to the end plate 28 and a valve body in the form of a valve disk 46 and a coil spring 48 designed valve spring accommodates.
  • the guide sleeve 44 carries a valve spring receptacle 50 which forms a support element which supports the helical spring 48.
  • the coil spring 48 is clamped between the valve spring holder 50 and the valve plate 46 and thereby exerts a spring force on the valve plate 46 in the direction of the through opening 30.
  • the inside diameter of the guide sleeve 44 is chosen larger than the diameter of the through opening 30, so that in the transition region between the through opening 30 and the guide sleeve 44 a radial extension is formed in the form of a step which forms an annular valve seat 52, on which the valve plate 46 comes to rest due to the spring load.
  • the hollow cylindrical guide sleeve 44 has two mutually opposite outflow openings 54 and 56 in the circumferential direction, which extend to approximately the height of the valve seat 52.
  • the outflow openings 54 and 56 are each rectangular in shape with axially extending longitudinal sides and upper and lower boundaries running transversely to the longitudinal axis 26, the lower boundary being formed by a sliding surface 58 oriented obliquely to the longitudinal axis 26 and facing the cover plate 28, while the upper boundary is formed by an outflow surface 60 facing away from the closure disk 28 and arranged approximately at the level of the valve seat 52 is formed parallel to the sliding surface 58, that is to say also at an angle to the longitudinal axis 26.
  • offset by 90 ° to the outflow openings 54 and 56 are formed in the guide sleeve 44 from their free end surface 62 facing away from the end plate 28 and extending to approximately the height of the valve seat 52, longitudinal slots 64, 66.
  • the valve spring receptacle 50 comprises a guide sleeve 44 which is oriented transversely to the longitudinal axis 26 and engaging web 68, which has wing-like latching hooks 70 and 72 in the area of the outflow openings 54 and 56. These engage in the outflow openings 54 and 56, and they have at their free ends of the end face 62 of the guide sleeve 44 facing ramp surfaces 74 which correspond to the sliding surfaces 58 of the outflow openings 54 and 56, so that the web 68 with the ramp surfaces 74 contact the surface Sliding surfaces 58 can be applied.
  • the run-up surfaces 74 thus each form an undercut with the sliding surfaces 58, so that the latching hooks 70 and 72 engage behind the outflow openings 54 and 56, respectively.
  • the filter bellows 24 carries the end cap 16.
  • This comprises an annular end plate 76, which is provided on its outer edge with an end ring 78 projecting upward in the axial direction, that is to say towards the end plate 28.
  • the end disk 56 carries a retaining ring 80 aligned coaxially to the longitudinal axis 26, the inner wall of which is provided with an annular groove 82 in which an O-ring 84 is arranged.
  • the filter bellows 24 is connected in the region of its end faces by means of an epoxy resin adhesive 86 or by means of another adhesive system, for example based on polyurethane resin, on the one hand to the end plate 28 and on the other hand to the end cap 16.
  • the adhesive 86 fills one in the axial direction between the outflow surface 60 and that of the filter bellows 24 facing underside of the cover plate 28 in the outside of the guide sleeve 44 molded adhesive receptacle 88.
  • This forms, with respect to the longitudinal axis 26, an undercut which gives the connection of the filter bellows 24 to the end plate 28 by means of the adhesive 86 a high mechanical stability in the axial direction. This ensures that the filter bellows 24 cannot detach from the cover plate 28 when the filter insert 10 is pulled out of a filter housing, which is not shown in the drawing and is known per se.
  • the end wall 14 with the end plate 28, the cylindrical sleeve 34 and the handle bar 38 and the guide sleeve 44 are designed as a one-piece plastic injection molded part.
  • the end wall 14 can be fixed radially in a suitable tool holder.
  • the valve plate 46 and the coil spring 48 can then be inserted into the guide sleeve 44 in the axial direction.
  • the valve spring holder 50 can then also be inserted in the axial direction into the guide sleeve 44 against the spring force of the helical spring 48.
  • the guide sleeve 44 is elastically deformable transversely to the longitudinal axis 26 and thus transversely to the direction of insertion of the valve spring receptacles 50, the longitudinal slots 64 and 66 being formed in the guide sleeve 44 in order to achieve the elastic deformability.
  • the guide sleeve 44 is first elastically deformed transversely to the longitudinal axis 26 until the latching hooks 70 and 72 engage in the outflow openings 54 and 56 and in this case engage behind the sliding surfaces 58.
  • the underside of the cover plate 28 is covered with an adhesive, and then the filter bellows 24 is inserted into the annular space between the bypass valve 32 and the sleeve 34, and the adhesive 86 is cured. Finally, the end cap 16 is placed on the filter bellows 24 after an adhesive has also been introduced into it, which then hardens.
  • the assembly of the filter insert 10 is thus very simple, and it can be made very inexpensively from plastic due to the one-piece design of the end wall 14.
  • the end wall 14 can in turn be produced in a cost-effective manner together with the manufacture of the valve plate 46 and the valve plate holder 50 in such a way that the three assembly parts are produced in the form of a one-piece combination injection-molded part.
  • a combination injection molded part is shown in Fig. 5.
  • the valve plate 46 and the valve plate receptacle 50 are molded onto the outside of the end wall 14 via narrow plastic bridges 90 and 92, respectively.
  • valve plate 46 and valve plate receptacle 50 can easily be broken off from end wall 14 or mechanically separated, while they are integrally connected to end wall 14 for storage and transport.
  • the filter insert 10 on the outside of the filter bellows 24 is flowed in the usual way by a fluid to be filtered.
  • the bypass valve 32 is provided in order to prevent mineral oil from being able to be supplied to an internal combustion engine, for example, due to the flow connection thus interrupted.
  • the bypass valve 32 opens by lifting the valve plate 46 from the valve seat 52 against the spring force of the helical spring 48.
  • the fluid can then flow through the passage opening 30, but is initially deflected in the radial direction when it hits the valve plate 46.
  • the fluid then strikes the outflow surface 60, which is oriented obliquely to the longitudinal axis 26, and thereby becomes oblique Longitudinal axis 26 aligned.
  • the outflow surface 60 thus forms a guide element for the fluid flowing through the passage opening 30, by means of which it is prevented that the fluid can flow through the openings 19 of the support tube 18 essentially perpendicularly.
  • the mechanical stress on the filter bellows 24 is consequently reduced by deflecting the fluid by means of the upper outflow surface 60.
  • the filter bellows 24 in the area of the bypass valve 32 is protected from being destroyed by the fluid usually flowing in via a radial bore due to the sleeve 34 surrounding the filter bellows 24 in this area.
  • the filter insert 10 is therefore characterized by a particularly good assembly, low manufacturing costs and high mechanical stability.

Abstract

Cartouche filtrante dotée d'une enveloppe possédant une matière de filtrage, d'une paroi fermant l'enveloppe sur son côté supérieur et possédant un passage et d'une soupape de dérivation permettant d'ouvrir et de fermer le passage. Ladite soupape possède un boîtier en plastique dans lequel sont logés un corps de soupape et un ressort de soupape exerçant une contrainte sur le corps de soupape en direction d'un siège de soupape. Selon la présente invention, le boîtier de soupape comporte un guide de soupape et la soupape comporte un élément de support séparé. Le corps et le ressort de soupape peuvent être introduits en vue de leur montage dans le guide de soupape et l'élément de support peut être finalement fixé au guide de soupape. On obtient ainsi une cartouche filtrante dont le montage est plus simple et dont la fabrication est moins onéreuse.
EP99931258A 1998-08-28 1999-07-07 Cartouche filtrante Withdrawn EP1113854A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19839190A DE19839190A1 (de) 1998-08-28 1998-08-28 Filtereinsatz
DE19839190 1998-08-28
PCT/EP1999/004768 WO2000012195A1 (fr) 1998-08-28 1999-07-07 Cartouche filtrante

Publications (1)

Publication Number Publication Date
EP1113854A1 true EP1113854A1 (fr) 2001-07-11

Family

ID=7879030

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99931258A Withdrawn EP1113854A1 (fr) 1998-08-28 1999-07-07 Cartouche filtrante

Country Status (5)

Country Link
US (1) US20010027941A1 (fr)
EP (1) EP1113854A1 (fr)
CA (1) CA2342326A1 (fr)
DE (1) DE19839190A1 (fr)
WO (1) WO2000012195A1 (fr)

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DE10026536A1 (de) * 2000-05-27 2001-11-29 Mann & Hummel Filter Filter
DE10103345A1 (de) * 2001-01-25 2002-08-14 Hermann Trabold Filterpackung zum Filtern von flüssigen oder gasförmigen Medien
US6641742B2 (en) 2001-08-22 2003-11-04 Fleetguard, Inc. Liquid filter with separate and calibrated vapor release
AT7367U3 (de) * 2004-09-16 2005-09-26 Johann Dumencic Filterkartusche
US7543711B1 (en) 2005-02-01 2009-06-09 Wix Filtration Corp Llc Fluid filter element
DE102006011844B4 (de) * 2006-03-15 2009-03-19 Rt-Filtertechnik Gmbh Filterelement
DE102006038100A1 (de) 2006-08-14 2008-02-21 Mann + Hummel Gmbh Filterelement, insbesondere zur Filtrierung von Flüssigkeiten oder Gasen
DE102007025541B3 (de) * 2007-05-31 2008-10-30 Sartorius Stedim Biotech Gmbh Filterkassetteneinheit
US8404029B2 (en) * 2007-06-14 2013-03-26 Donaldson Company, Inc. Crankcase ventilation filter arrangments; components; and, methods
FR2928207B1 (fr) * 2008-02-29 2010-03-26 Hispano Suiza Sa Installation d'echangeur thermique
US20100006483A1 (en) * 2008-07-10 2010-01-14 Ravi Yekula Replaceable filter elements including unique pressure relief and systems including same
SG11201901156PA (en) * 2016-10-20 2019-03-28 Emd Millipore Corp Valve protection and tube management device
DE102019208164A1 (de) * 2019-06-05 2020-12-10 Robert Bosch Gmbh Dosiersystem für einen Betriebs- und/oder Hilfsstoff
CN114225503B (zh) * 2021-12-23 2023-05-09 武昌船舶重工集团有限公司 一种海水过滤器

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IT1237973B (it) * 1990-02-09 1993-06-19 Filtro olio di lubrificazione di motori a combustione interna per automezzi
DE4243217C2 (de) * 1992-12-19 2003-04-30 Mahle Filtersysteme Gmbh Flüssigkeitsfilter
US5395518A (en) * 1993-08-31 1995-03-07 Donaldson Company, Inc. High pressure filter with integral relief valve
DE19507163C2 (de) * 1995-03-01 1998-09-10 Knecht Filterwerke Gmbh Radial durchströmtes Ringfilter
DE19546440A1 (de) * 1995-12-13 1997-06-19 Hydac Filtertechnik Gmbh Filtervorrichtung mit Bypaßventil

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Title
See references of WO0012195A1 *

Also Published As

Publication number Publication date
US20010027941A1 (en) 2001-10-11
CA2342326A1 (fr) 2000-03-09
DE19839190A1 (de) 2000-03-02
WO2000012195A1 (fr) 2000-03-09

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