WO1999020366A1 - Dispositif de soupape de derivation utilise dans des filtres et procede associe - Google Patents

Dispositif de soupape de derivation utilise dans des filtres et procede associe Download PDF

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Publication number
WO1999020366A1
WO1999020366A1 PCT/US1998/022293 US9822293W WO9920366A1 WO 1999020366 A1 WO1999020366 A1 WO 1999020366A1 US 9822293 W US9822293 W US 9822293W WO 9920366 A1 WO9920366 A1 WO 9920366A1
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WO
WIPO (PCT)
Prior art keywords
filter
cover piece
flow passageway
bypass flow
band
Prior art date
Application number
PCT/US1998/022293
Other languages
English (en)
Inventor
Michael Jon Gustafson
Original Assignee
Donaldson Company, Inc.
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 Donaldson Company, Inc. filed Critical Donaldson Company, Inc.
Publication of WO1999020366A1 publication Critical patent/WO1999020366A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D27/00—Cartridge filters of the throw-away type
    • B01D27/04—Cartridge filters of the throw-away type with cartridges made of a piece of unitary material, e.g. filter paper
    • B01D27/06—Cartridge filters of the throw-away type with cartridges made of a piece of unitary material, e.g. filter paper with corrugated, folded or wound material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D27/00—Cartridge filters of the throw-away type
    • B01D27/10—Safety devices, e.g. by-passes
    • B01D27/103—Bypass or safety valves

Definitions

  • the present invention relates to filter constructions. It particularly concerns a bypass valve for use in filter constructions.
  • the arrangement is well adapted for use in connection with fluid filters such as lubricating filters and hydraulic fluid filters.
  • Certain types of fluid filters for example, oil filters or hydraulic fluid filters, operate to remove substantial amounts of particulate material from liquid flow, typically in a circulating environment.
  • ensuring an appropriate liquid flow to machinery parts is of concern, to ensure proper machinery operation.
  • Bypass flow arrangements have been developed to accommodate this.
  • the fluid filter construction preferably comprises a filter cartridge having internally received components as described herein operably positioned therein.
  • the filter cartridge is preferably constructed and arranged for mounting on a filter base, in a fluid filter system.
  • the system may comprise, for example, a lubricating filter, such as an oil filter, or a hydraulic fluid filter.
  • the system may be used in a wide variety of mechanical systems, such as an automotive engine.
  • the cartridge generally has an outer wall or can, defining a cartridge housing.
  • a cover piece having a structure, typically a central post, defining a fluid outlet flow passageway therein.
  • the structure i.e. central post
  • the structure includes a bypass flow passageway therethrough.
  • bypass flow passageway and variants thereof are generally meant to refer to a fluid flow passageway which allows for passage of fluid directly into the outlet flow passageway, and bypassing the ordinary filtering flow path through the filter media, in the arrangement.
  • a valve member is positioned in covering relation to the bypass flow passageway.
  • the valve member is constructed and arranged to selectively open the bypass flow passageway in response to a selected pressure differential across the bypass flow passageway.
  • selected pressure differential across the bypass flow passageway and variants thereof, are meant to refer to a pressure differential between the ends of the bypass flow passageway, typically generated by a pressure differential across the filter element received within the cartridge. That is, either as a result of suction draw downstream from the filter element, or fluid pressure applied upstream from the filter element, a pressure differential across an occluded filter element develops.
  • valve member is constructed and arranged to open.
  • valve completely seal until the selected pressure differential is overcome. A substantial closure, but some leakage, prior to the selected pressure differential being overcome, will be tolerable in some systems.
  • the bypass flow passageway comprises a plurality of apertures through the cover piece central post.
  • the apertures may have a variety of sizes and shapes, depending on the particular flow characteristics desired, and pressure differential selected for opening.
  • the valve member comprises a circular ring or band. In certain arrangements, it is a continuous such band.
  • the valve member is positioned in a valve seat which lines the outlet flow passageway in the structure (central post).
  • the structure for example the cover piece central post, also includes a circular gasket seat thereon, and the cartridge includes therein a cylindrical filter element and a sealing gasket.
  • the sealing gasket is nested against the circular gasket seat, providing sealing between the structure, for example the central post, and the cylindrical filter element. Biasing pressure to maintain the seal (or to keep the valve as "closed” as desired until the selected pressure differential is overcome) is provided, in certain preferred arrangements, by an internally positioned biasing arrangement (typically a spring).
  • the cover piece comprises metal and the valve member comprises a steel spring and a rubber, plastic, or metal seal.
  • the cylindrical filter element positioned within the filter cartridge comprises a first end cap, a second end cap, and cylindrical filter media extending between the first and second end caps.
  • the cylindrical filter element will further include an inner liner and outer liner; and, the cylindrical filter media will comprise pleated media, typically pleated cellulose media.
  • the media may comprise a variety of alternative constructions including synthetic media, composites or laminates of synthetic media and cellulose media.
  • the inner and outer liners will comprise metal or plastic perforation.
  • the filter cartridge outer housing defines an internal volume of appropriate size to operably contain therein the cover piece, the filter element, the valve member, the sealing gasket and the spring. Also, preferably, it includes an internally threaded bore which is constructed and arranged for threadibly mounting the filter construction or cartridge to a filter base, in a fluid filter system.
  • the filter cartridge is a "spin-on" filter cartridge.
  • a cover piece construction for a filter cartridge is provided.
  • the cover piece construction generally comprises a cover piece, as described above, having a valve member as described above positioned thereon.
  • the valve member is positioned in a valve seat which lines an outlet flow passageway in the cover piece.
  • a method of providing for bypass flow in a fluid filter system generally comprises opening a bypass flow passageway in a cover piece, within a filter cartridge, in response to selected pressure differential across the bypass flow passageway.
  • the method is conducted by providing a valve member which biases away from a circumferential valve seat to open the bypass flow passageway.
  • circumferential valve seat and variants thereof in this context are meant to refer to valve seats which circumscribe, or are positioned around, an associated valve ring or valve member.
  • Fig. 1 is a side elevational view of an assembly including a filter valve arrangement, according to the present invention therein;
  • Fig. 2 is a schematic, cross-sectional view of a filter cartridge, shown in FIG. 1;
  • Fig. 3 is a perspective view of a component of the arrangement shown in Figs. 1 and 2;
  • Fig. 4 is a side elevational view of the component shown in Fig. 3;
  • Fig. 5 is an exploded perspective view of the component shown in
  • FIG. 3; Fig. 6 is a fragmented, schematic, cross-sectional view of a first alternate embodiment of a bypass valve construction, according to the present invention
  • Fig. 7 is a view analogous to Fig. 6, depicting a second alternate embodiment of a bypass valve construction.
  • Fig. 8 is a view analogous to Fig. 6-7, depicting a third embodiment of an alternate bypass valve construction.
  • the reference numeral 1, Fig. 1 generally indicates an assembly incorporating a bypass valve construction according to the present invention therein.
  • the assembly 1 includes a fluid filter construction or cartridge 2 mounted on a filter base 3 (sometimes referred to as a filter head).
  • assembly 1 is constructed as an oil filter. Oil to be filtered would generally enter base 3 in the direction of arrow 5, through entrance port 6. The fluid flow would be directed through cartridge 2, for filtering in a preferred manner as described below. The filtered oil would then pass back into filter base 3 and outwardly therefrom, in the direction indicated generally by arrow 8 through exit port 9.
  • the entrance port 6 and exit port 9 would be constructed, configured and positioned appropriately for connection with suitable couplings and fluid flow conduits.
  • filter cartridge 2 Periodically, filter cartridge 2 is dismounted from base 3, for servicing. Typically, engagement between the filter cartridge 2 and base 3 is threaded, with the cartridge 2 being a spin-on filter or filter cartridge. Spin-on arrangements are common. In many instances, cartridge 2 would be designed to be removable and replaceable. That is, periodically cartridge 2 is replaced with a new or refurbished cartridge.
  • FIG. 2 is a schematic representation of the filter cartridge arrangement of Fig. 1, shown in cross-section. From a review of Fig. 2, it can be seen that the particular embodiment shown is a "forward flow” system. That is, during operation, fluid flow during filtering is from an exterior region of the filter element through to an interior region. Such arrangements are conventionally .known as “forward flow” arrangements, as opposed to “reverse flow” arrangements, i.e., arrangements in which the fluid flow is directed oppositely.
  • filter cartridge 2 includes an outer wall structure 15, and internally positioned filter element or construction 16.
  • Filter construction 16 includes media 17 bounded by an inner liner 19.
  • the media 17 also extends between end cap 20 and end cap 21.
  • a variety of media configurations and materials can be used, for media 17.
  • the particular configuration shown is generally cylindrical, with the media defining an internal volume 35.
  • media 17 comprises a conventional, cylindrical, pleated filter media potted between end caps 20 and 21.
  • the specific media 17 depicted is synthetic media.
  • Internal spring 25 operates as a form of filter element biasing mechanism and compresses filter construction 16 into gasket 26 and outlet post 27, obtaining a seal to fluid flow in circumvention of filter media 17.
  • Internal spring 25 operates as a form of filter element biasing mechanism and compresses filter construction 16 into gasket 26 and outlet post 27, obtaining a seal to fluid flow in circumvention of filter media 17.
  • Such features are also generally found in a wide variety of liquid filter constructions, with variations depending upon specific applications and other features.
  • Such arrangements of material as disclosed in U.S. patents 4,872,976; 4,364,825; and 4,832,844, incorporated herein by reference, adapted to accommodate features associated with a bypass valve construction described herein, are applicable.
  • filter construction 16 also includes a structure comprising a head piece or cover piece 30 therein.
  • Cover piece 30 is securely retained within outer wall structure 15, with filter construction 16 sealed thereagainst, by gasket 26 and pressure applied by spring 25.
  • cover piece 30 is generally positioned between filter construction 16 and open end 55 in cartridge 2.
  • Cover piece 30 includes a plurality of flow apertures 31 therein, to allow fluid flow to be directed into cavity 32, between media 17 and outer wall structure 15, during operation.
  • Cover piece 30 also includes outlet post 27 thereon, with an internally received flow passageway 34 positioned to operate as a fluid flow outlet from region 35.
  • Region 35 is the interior region defined by cylindrical media 17, into which filter liquid flows during operation.
  • cover piece 30 has features which are generally conventional and known for fluid filter constructions such as those described in U.S. patents 4,834,885; 4,743,374; and 4,969,994, incorporated herein by reference. .Analogous material and structural features to those described in these references, again except for variations to accommodate a bypass valve construction as described herein, may be used for certain applications. aArrangements such as those described above can be operated under either pressure directed to fluid flow in the direction of arrow 5, Fig. 1, or suction applied to pull fluid in the direction of arrow 8, Fig. 1. Attention is now directed to features in Fig.
  • outlet post 27 of cover piece 30 includes a region 42 thereon which includes a fluid flow passageway 43 therethrough.
  • the particular fluid flow passageway 43 comprises a plurality of apertures 44; the apertures being oriented in a portion of the assembly in which direct fluid flow from cavity 32 terminating in outlet flow passageway 34, without passage through the media 17, is possible.
  • the passageway 43 is generally referred to as a "bypass" flow passageway.
  • a valve seat 46 In a regionof outlet post region 43, in alignment with apertures 44, is positioned a valve seat 46.
  • the valve seat 46 for the arrangement shown, is positioned on an interior wall 45a of outlet post 34 and lines a portion of passageway 34.
  • valve seat 46 is positioned in valve seat 46 (i.e., within passageway 34 in the preferred embodiment shown), in covering relation to apertures 44.
  • valve seat 46 is circumferential; that is, it circumscribes valve member 48.
  • the valve seat 46 includes a circumferential recessed portion along interior wall 45a.
  • Valve member 48 in operation, performs as a diaphragm type valve member. It is retained against apertures 44 (i.e., is closed), unless a pressure in the direction of arrow 160 becomes sufficiently large to overcome the closing pressure. When such is the case, valve member 48 is biased away from covering relationship with respect to apertures 44, to allow liquid flow (i.e., bypass flow) into flow passageway 34, from cavity 32, without filtering through media 17.
  • the valve member 48 is a thin band or ring 50 of appropriate size to fit securely within seat 46.
  • the band 50 may be continuous, as shown in Fig. 5, but alternate constructions are possible. Preferred materials for band 50, to provide appropriate resistance and sealing, are described hereinbelow.
  • valve is not only closed but it is also sealed. While in some systems a seal may be desired, typically some amount of leakage can be tolerated.
  • the primary variables for controlling opening operation of the bypass valve arrangement are the following: the size and number of the holes or apertures 44; and, the spring pressure applied by valve member 48.
  • the actuating pressure means the amount of pressure required to actuate the valve member, or move the valve member, into an open position.
  • the pressures within the following ranges will typically be selected as the "selected" pressure differential: For an oil filter in an engine, about 5-12 psid (pounds per square inch, differential) (34-83 kPa differential); for a hydraulic filter in a hydraulic system, 10-70 psid (69-483 kPa differential).
  • a perspective view of a preferred cover piece 30 is depicted.
  • the cover piece 30 depicted in Fig. 3 is shown molded from a material such as aluminum. It includes an outer peripheral rim 60 which, in use, is positioned within can, housing or outer wall structure 15, Fig. 2. Cover piece 30 further includes a plurality of flow apertures 31, allowing for fluid flow, Fig. 2, from region 13 into region 32.
  • a center post 70 is depicted, including a lower peripheral rim 71 against which gasket 26, Fig. 2, seals in use.
  • Post 70 further includes region 72 therein, circumscribing central exit flow passageway 34.
  • Region 72 includes flow apertures 44 therethrough.
  • flow apertures 44 comprise oval apertures 75.
  • flow apertures may be circular, or other shapes and sizes, or a combination of other shapes and sizes. It is anticipated that for the arrangement shown in Fig. 3, a set of flow apertures 44 analogous to the ones viewable are positioned radially 180° opposite, out of view.
  • the valve member 48 comprises a band 80 positioned on an interior of post 70, i.e., defining a portion of flow passageway 34.
  • the band 80 is nested within valve seat 46.
  • Cover piece 30 further includes radially directed fingers 90, beneath outer rim 30.
  • the fingers 90 add strength to the system.
  • On lower side 91 of each finger is positioned a pad 92.
  • the pads 92 operate as a fillet to add strength to the assembly.
  • a side elevational view of the cover piece 30 is depicted.
  • FIG. 5 an exploded perspective view of the arrangement shown in Fig. 3 is provided.
  • Fig. 6 depicts a fragmented, schematic, cross-sectional view of an alternate cover piece.
  • a portion of a cover piece 100 is shown in fragmented, cross-sectional view.
  • Cover piece 100 is analogous to cover piece 30 illustrated in Figs. 1-5, with the following modifications therein.
  • On an interior wall 101 of cover piece 100 is machined a groove 102 at one end (i.e., along interior wall 101) of apertures 104.
  • Apertures 104 are analogous to apertures 44 in the embodiment of Figs. 1-5.
  • Interior wall 101 also defines a circular retaining shelf 106. Retaining shelf 106 acts as a valve seat, and helps to retain and hold a valve member 110 in covering relation to apertures 104.
  • Retaining shelf 106 acts as a valve seat, and helps to retain and hold a valve member 110 in covering relation to apertures 104.
  • the valve member 110 comprises a circular coiled spring 112 aligning the interior wall 101 of the cover piece 100.
  • the coiled spring 112 is secured to a retaining ring 114 to secure it within the cover piece 100.
  • the retaining ring 114 engages and fits within the shelf 106.
  • the spring 112 may be coated in a rubber material for the purpose of creating a seal with apertures 104 when the valve is in a closed position.
  • a finger 116 is also illustrated in Fig. 6, and is analogous to fingers 90 in the Figs. 1-5 embodiment.
  • the Fig. 6 embodiment illustrates the valve member 110 in a closed orientation.
  • the valve member 110 moves into an open orientation. That is, the coiled spring 112 deflects away from a covering relation to the apertures 104 and permits fluid to pass through the apertures 104.
  • Fig. 7 illustrates another alternative bypass arrangement.
  • the Fig. 7 bypass arrangement is similar to Fig. 6, except that there is no machined groove similar to groove 102 in the interior wall of the cover piece.
  • the valve member 120 includes a coiled spring 122 with a flat surface for mating with interior wall 123 of the cover piece.
  • the coiled spring 122 is typically coated with a rubber material for creating a seal over the apertures 124.
  • the Fig. 7 embodiment illustrates the valve member 120 in a closed position.
  • the coiled spring 122 When installed in the filter construction such as that illustrated in Fig. 1, as the pressure differential builds and creates a force which overcomes the force exerted by the coiled spring 122, the coiled spring 122 will deflect and permit fluid to pass through the apertures 124.
  • Fig. 8 is another alternate embodiment of a bypass arrangement. In
  • a valve member 130 comprises a flat spring 132 having a lip 134 for engaging a shelf 136 in the cover member.
  • the flat spring 132 extends over and is in covering relation to apertures 138.
  • the flat spring 132 is typically coated with rubber for creating a seal over the apertures 138.
  • the Fig. 8 embodiment illustrates the valve member 130 in a closed position.
  • the flat spring 132 deflects away from the internal wall 140 of the cover member and allows fluid to pass through the apertures 138. . Any of these arrangements may be utilized with a stamped metal baffle plate.
  • the filter construction may include a stamped metal baffle plate defining inlet apertures therethrough.
  • a cylindrical tube is secured to the baffle plate, such as by spot welding.
  • the cylindrical tube is in fluid communication with an outlet aperture defined by the stamped metal baffle plate.
  • the cylindrical tube includes bypass flow apertures analogous to apertures 44.
  • the cylindrical tube includes a valve seat analogous to valve seat 46 and a valve member, such as that analogous to ring 80.
  • the first specific example is for use as an engine oil filter.
  • Such systems typically filter oil at a rate of about 5-25 gpm.
  • the housing is constructed from metal.
  • the housing 2 has an outer diameter of about 11/16 inches (17 mm), and a length of about 6 inches (15 cm).
  • the filter media includes a media made from synthetic fibers. This media has an efficiency of about 98% for 22 microns, and a typical life of about 400 hours. Installed in the arrangement shown in FIG. 1, the media has an outside diameter of about 3 inches (76 mm), and an inside diameter of about 1.75 inches (44 mm).
  • End caps on the filter element are constructed from metal.
  • the first end cap 20 has an outer diameter of about 3 1/16 inches (78 mm), and an inner diameter for receiving the outlet post 27 of about 1 11/16 inches (43 mm).
  • the second end cap 21 has an outer diameter of about 3 1/16 inches (78 mm).
  • Spring 25 is a coil with about 3 coils. In an uncompressed state, spring 25 has a length of about 1 inch (25 mm), a diameter of about 3/4 inches (19 mm), and is constructed from stainless steel. Spring 25 has a constant of about 40 lbs/in.
  • the head piece 30 is constructed from steel.
  • the rim 60 has an outer diameter of about 3 inches (76 mm).
  • the rim 71 has an outer diameter of about 7/8 inches (22 mm), and an inner diameter of about 3/4 inches (19 mm).
  • the radius at each end of each oval is about 1/8 inches (3 mm).
  • the distance between opposite oval ends is about 3/4 inches (19 mm).
  • the area defined by each oval is about 0J sq. inches (65 sq. mm).
  • the band 50 has an outer diameter of about 13/16 inches (21 mm), an inner diameter of about 3/4 inches (19 mm), and a length of about 2.5 inches (64 mm).
  • the band defines an outside surface area of about 1 sq. inch (6.5 sq. cm).
  • the band is constructed of metal or metal laminated to rubber. It has a spring constant of about 15 lbs/in. The band will deflect from a closed position to an open position at a pressure differential of about 10 psid.
  • the second specific example is for use as a hydraulic filter. Such systems typically filter hydraulic fluid at a rate of about 5-65 gpm.
  • the housing is constructed from metal.
  • the housing 2 has an outer diameter of about 5 inches (127 mm), and a length of about 9 inches (229 mm).
  • the filter media includes a media made from synthetic fibers. This media has an efficiency of about 98% with 22 microns, and a typical life of about 800 hours. Installed in the arrangement shown in FIG. 1 , the media has an outside diameter of about 4.5 inches (114 mm), and an inside diameter of about 1.75 inches (44 mm).
  • End caps on the filter element are constructed from metal.
  • the first end cap 20 has an outer diameter of about 4 5/8 inches (117 mm), and an inner diameter for receiving the outlet post 27 of about 1 11/16 inches (43 mm).
  • the second end cap 21 has an outer diameter of about 4 5/8 inches (117 mm).
  • Spring 25 is a coil with about 3 coils. In an uncompressed state, spring 25 has a length of about 1 inch (25 mm), a diameter of about 7/8 inches (22 mm), and is constructed from steel (music wire). Spring 25 has a constant of about 50 lbs/in.
  • the head piece 30 is constructed from aluminum.
  • the rim 60 has an outer diameter of about 4 11/16 inches (119 mm).
  • the rim 71 has an outer diameter of about 1.75 inches (44 mm), and an inner diameter of about 1.5 inches (38 mm).
  • the radius at each end of each oval is about 0.25 inches (6 mm).
  • the distance between opposite oval ends is about 3/8 inches (9 mm).
  • the area defined by each oval is about 0J sq. inches (65 sq. mm).
  • the band 50 has an outer diameter of about 1.5 inches (38 mm), an inner diameter of about 1 7/16 inches (37 mm), and a length of about 4.75 inches (121 mm).
  • the band defines an outside surface area of about 2.25 sq. inches (14.5 sq. cm).
  • the band is constructed of metal and/or metal with a rubber type seal. It has a spring constant of about 30 lb/in. The band will deflect from a closed position to an open position at a pressure differential of about 20 psid. Since many embodiments of the invention can be made without departing from the spirit and scope of the invention, the invention resides in the claims hereinafter appended.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

On décrit une construction de filtre pour fluide. La construction de filtre pour fluide comprend en général une cartouche de filtre dans laquelle se loge un élément filtrant, un couvercle et un élément de soupape. Le couvercle comporte un passage pour le fluide de dérivation. l'élément de soupape est placé de manière à recouvrir le passage pour le fluide de dérivation, il est construit et disposé pour ouvrir le passage pour le fluide de dérivation en réponse à une différence de pression sélectionnée au niveau du passage pour le fluide de dérivation.
PCT/US1998/022293 1997-10-22 1998-10-21 Dispositif de soupape de derivation utilise dans des filtres et procede associe WO1999020366A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US95578197A 1997-10-22 1997-10-22
US08/955,781 1997-10-22

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WO1999020366A1 true WO1999020366A1 (fr) 1999-04-29

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785491A (en) * 1971-10-28 1974-01-15 Purolator Inc Filter anti-drainback and relief valves
US3844947A (en) * 1972-09-27 1974-10-29 Carborundum Co Pressure responsive check valve
US3896848A (en) * 1972-09-27 1975-07-29 Carborundum Co Pressure responsive check valve
EP0473261A2 (fr) * 1990-06-27 1992-03-04 Mitsubishi Oil Co., Ltd Soupape de réglage de la pression
US5284579A (en) * 1992-08-31 1994-02-08 Dana Corporation One-piece anti-drainback and relief valve
US5405527A (en) * 1994-02-24 1995-04-11 Dana Corporation Anti-drainback/pressure-relieved filter cartridges for lubricating oil
WO1997044113A1 (fr) * 1996-05-23 1997-11-27 Filtertek Inc. Soupape de surete utilisee dans un filtre a huile

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785491A (en) * 1971-10-28 1974-01-15 Purolator Inc Filter anti-drainback and relief valves
US3844947A (en) * 1972-09-27 1974-10-29 Carborundum Co Pressure responsive check valve
US3896848A (en) * 1972-09-27 1975-07-29 Carborundum Co Pressure responsive check valve
EP0473261A2 (fr) * 1990-06-27 1992-03-04 Mitsubishi Oil Co., Ltd Soupape de réglage de la pression
US5284579A (en) * 1992-08-31 1994-02-08 Dana Corporation One-piece anti-drainback and relief valve
US5405527A (en) * 1994-02-24 1995-04-11 Dana Corporation Anti-drainback/pressure-relieved filter cartridges for lubricating oil
WO1997044113A1 (fr) * 1996-05-23 1997-11-27 Filtertek Inc. Soupape de surete utilisee dans un filtre a huile

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