MXPA00001736A - Arrangement and method for sealing fluid filters - Google Patents

Abstract

A seal arrangement for fluid filters is provided. The seal arrangement generally concerns compressing a gasket between selected portions of the filter base and filter cartridge. A preferred frusto-conical configuration is provided, to advantage. Methods of assembly and use are described, as well as preferred filter base configurations and preferred filter cartridge configurations.

Description

ARRANGEMENT AND METHOD FOR SEALING FLUID FILTERS FIELD OF THE INVENTION The present invention is generally concerned with fluid filters. In certain particular embodiments shown, it is concerned with filters for fluid of the rotating type. More particularly, the invention is concerned with a seal formed between rotating filter cartridges and a filter base when the filter cartridge is mounted on the base. Methods for carrying out a preferred seal are provided.

BACKGROUND OF THE INVENTION Rotary filter arrays have been employed in a variety of applications including, for example, hydraulic systems, fuel systems and lubrication systems. Such filter arrangements generally include a filter element positioned within a can, box or housing having a cover plate or upper plate at one end thereof, by means of which the filter can be mounted on a filter head or filter base. A central opening and several openings or surrounding holes in the cover are usually provided to direct the flow through the filter and filter element therein, such flow can be either in an indoor / outdoor configuration (reverse flow) or a REF .: 32766 exterior / interior configuration (direct flow). A circular seal on the outside of the cover serves as an external seal between the filter and the filter head. A gasket (or combination of gaskets) on the inside of the cover functions as an internal seal between portions of the filter element and the cover. Rotary filters are commonly designed to be used for a limited period, with removal of tracking and replacement during service. Herein the combination of can, element and other components that are "rotatable" or otherwise mounted on the basis of the filter will sometimes be referred to as the removable and replaceable cartridge or filter cartridge. A variety of conventional arrangements have been stripped to provide a sealing engagement with respect to the flow of fluid outwardly between the base of the filter and the cartridge. Many of these are concerned with an O-ring, compressed, axially between the two as the filter cartridge is rotated on the filter base. Examples of these are shown in U.S. Patent No. 4,969,994, Figure 1 in 7 and Figure 3 in 134; in U.S. Patent 4,369,113 in Figure 2 in 44 and in U.S. Patent 4,743,374 in Figures 2 and 5 in 46. The complete disclosures of the '994,' 113 and '374 patents are incorporated herein by reference.

International publication O-A-95/11072 discusses a filter assembly attached to a box, wherein a portion of a filter container is contacted directly with the box. In Figures 15 and 17, O-A-95/11072 shows protuberances 124 on the housing that come into contact with an end surface of the filter assembly. U.S. Patent 4,832,844 shows a seal for a rotary filter wherein a graduated or stepped gasket is used between a filter and a filter head. The reliability and durability of the seal between the filter for liquids and the filter head is important. Significant leaks of fluid that is filtered during operation can result in catastrophic damage to the engine, vehicle components or other equipment and components involved.

BRIEF DESCRIPTION OF THE INVENTION In accordance with certain aspects of the present invention, a filter assembly is provided. The filter assembly comprises: a filter base; a removable and replaceable filter cartridge mounted on the base of the filter and a seal pressed between the base of the filter and the filter cartridge. The base of the filter generally includes an inwardly directed sealing surface (commonly directed radially inward), preferably frustoconical configuration. The term "radially" directed inward means that: the sealing surface is circular in configuration and the sealing surface circumscribes and is directed towards a central axis. The term "frustocomica" in this context means that the sealing surface has a flat portion in cross section (seen in a plane having the central axis therein) and thus defines a conical trunk surface. In general, the preferred arrangement is constructed and arranged in such a way that the seal is compressed between the frusto-conical sealing surface and a seal seat on the filter cartridge. Preferably, the frustoconical sealing surface has a flat portion in cross section that has a width in a range of 0.25 cm (0.100 inches) to 1.90 cm (0.750 inches). Also preferably, this flat portion of the frusto-conical sealing surface extends at an angle from about 85 ° to about 45 ° relative to a plane perpendicular to a center line (central axis) of the frusto-conical sealing surface. In the preferred assembly, the joint has a generally circular cross section. Thus, the seal is preferably an O-ring with a circular cross-section.

In the typical embodiment shown, the filter cartridge includes an end wall part having: a central recess or recess portion; an external wall, an internal wall, with the central hollow and the inner wall that define the joint seat against which the O-ring is compressed. In general, the central hollow extends between the internal and external walls, the internal and external walls are generally axially directed in extension from the hollow or recess, that is, the inner wall and the outer wall project generally towards the base of the filter during assembly. Preferably, the base of the filter includes a central post of circular cross-section (seen in a plane perpendicular to the center line), with external threads thereon and the filter cartridge includes a threaded bore internally dimensioned and configured to be received from Threaded way over the central post. Thus, in preferred embodiments, the filter cartridge is a rotary filter that is mounted on the filter base when being threaded thereon. The compression of the joint then, to form the seal, occurs as a result of the threading action (or assembly); that is, removing the cartridge towards the base of the filter. Preferably, the base of the filter includes a skirt structure or wall structure, constructed and arranged to directly contact a portion of the central void in the wall part of the end of the cartridge, when the filter cartridge is mounted on the top of the cartridge. filter base. Thus, preferably, when a rotating filter is involved, the rotation is carried out until a selected rigid portion of the filter base is brought into direct contact with a selected rigid portion of the filter cartridge, providing a "hard seal". to the assembly. This helps avoid the conjecture of proper levels of joint compression. In the immediate location of the arrangement where the "hold" is carried out, the joint is not positioned between the two contact pieces. Of course, the joint is compressed between the frusto-conical sealing surface and the filter cartridge. However, where the "hard seal" is present, preferably the base wall structure of the filter is directly contacted or spliced with the filter cartridge. In a preferred embodiment, the base wall structure of the filter includes an external shoulder with a plurality of protuberances or projections thereon, each of the plurality of protrusions projecting in a direction toward and in direct contact with a recess or recess in the wall part of the end of the filter cartridge, when the filter cartridge is operatively mounted on the base of the filter. "Operationally mounted" in this context means that the assembly is configured for use. Of course, when protrusions of the type described in this paragraph are used, they are the protuberances that provide the hard seal against the filter cartridge. In preferred embodiments, the base wall structure includes an inner wall portion and the frusto-conical sealing portion comprises a portion of the inner wall portion of the wall structure of the base. That is, the protuberances which provide the hard seal and the frusto-conical sealing surface are positioned on the same base wall structure, but at different sites, in certain preferred embodiments. Preferably, the base of the filter comprises a metal casting, for example aluminum, magnesium, zinc-sand casting or molding. The filter cartridge is preferably a filter for liquids. The filter cartridge can be either a direct flow filter or a reverse flow filter. Typical mounting applications are like a hydraulic filter, lubricating oil for engine, fuel or coolant filter in internal combustion engines. Also, according to the present invention, a filter base is provided. The filter base is generally one that is usable to form an assembly of the type previously described. Then the base of the filter would generally comprise a central post having an external threaded surface and a base wall circumscribing the central post and spaced therefrom. The base wall preferably has a frusto-conical sealing surface on an inner portion thereof and directed towards the central post. The frustoconical sealing surface preferably has a flat portion in cross section of the type described above. Also, the base wall preferably includes a plurality of protuberances of the type described above for use in forming hard contact as described. Also, in accordance with the present invention, a preferred filter cartridge is provided. The filter cartridge preferably has one. End piece including a central recess or recess positioned between an axially directed external wall and an axially directed internal wall. Also, preferably, a sealing gasket is provided on the filter cartridge which circumscribes the axially directed inner wall connected against the central recess and axially directed internal wall. In such arrangements, preferably the axially directed inner wall includes a flange that extends over at least a portion of the seal. This flange, in conjunction with the axially directed wall and the recess, will form a joint for the joint and will protect the joint during packing, handling and assembly. In accordance with the present invention, there is provided a method for sealing a filter cartridge to a filter base. In general, the method is concerned with mounting a filter cartridge on a portion of a filter base while compressing a seal between them. Preferably the constructions are used as described hereinabove.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a side elevational view of a combination of a filter element and filter base having a seal according to the present invention incorporated therein; Figure 2 is a partially schematic cross-sectional view taken generally along line 2-2 of Figure 1; Figure 3 is an enlarged fragmentary cross-sectional view of a portion of the arrangement shown in Figure 2; Figure 4 is an enlarged side elevation view of a filter base similar to that shown in the assembly of Figure 1; and Figure 5 is a bottom plan view of the filter base shown in Figure 4.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES I. Some Problems With Conventional Arrangements In many instances, fluid filter arrays are mounted on the motor or are otherwise mounted on moving vibrating machinery and as such are exposed to significant vibration and shock during the normal operation of the machine. Many of the seal systems designed for conventional rotary filters are designed in such a way that it depends on a face seal to provide the seal of the contained fluid. The joint can also serve as a vital structural component in mounting to the filter base, providing a support surface to the base of the filter that provides rigidity to the assembly. The dependence of an elastomer for a rigid interface can be problematic. For example, when exposed to vibration and shock, the joint flexes and can suffer from pinching or other damage and fatigue of the material due to excessive stress on the material. This can result in significant leaks that can lead to catastrophic failures in the system. Another related problem is concerning the installation method associated in general with the joints of surface sealing type. Commonly, the proper installation is specified as the rotation of the filter until the joint comes into contact with the sealing surface and then the additional tightening by a specified fraction of a turn. In some instances, during service, the filter is not properly tightened because there is no fixed reference point to consistently determine the proper fraction of a turn. Uniformly spaced marks around the circumference are usually provided as a visual reference, but they are not a reliable means of ensuring proper installation.

II. FIGURES 1-5 Reference numeral 1, FIG. 1, designates in general a mounting according to the present invention, comprising a filter base 4 (sometimes referred to as a filter head); a removable and replaceable filter or filter cartridge 5 and a seal ring, not shown in Figure 1, properly positioned between the filter cartridge 5 and the base 4 of the filter to cause a seal therebetween. The filter ring is shown in FIG. 2 with the reference number 10. Still with reference to FIG. 1, in general, an assembly or assembly 1 is installed for use to filter a fluid in a mechanical system, for example, a hydraulic fluid system in construction equipment or lubricating fluid system in a vehi(truck, wheel loader) or associated with a motor or some other form of equipment (for example motorized stationary). The base 4 of the filter in such assemblies 1 is generally assembled semi-permanently to the equipment. The filter cartridge 5, on the other hand, is an artidesigned to service it on a regular basis, commonly by replacement. In general, the cartridge 5 of the filter is of limited life and is removed and replaced, during the routine service of the equipment. Referring now to Figure 2, Figure 2 is a cross-sectional view taken generally along line 2-2, Figure 1. Figure 2 is somewhat schematic in its presentation for simplicity and clarity. With reference to figure 2, the base 4 of the filter generally comprises a seamless molding, commonly of metal, for example an aluminum molded part, machined by appropriate characteristics. With reference to Figure 2, the base 4 of the filter includes an opening 15 for the inlet of the fluid flow and the inlet conduit 16 of the internal fluid, ending at the outlet 17. In addition, the base 4 of the filter includes the conduit 20 of flow outlet of the fluid extending between the inlet opening 21 and the outlet opening 23. The base 4 of the filter includes a central mounting post 25 thereon, commonly circular in cross section in relation to Figure 2, defining a portion 26 of the conduit 20 extending therebetween and having on an outer surface thereof mounting threads 28 for the filter cartridge 5. With reference still to Figure 2, the cartridge 5 of the filter is now called attention. The cartridge 5 of the filter includes: a can or outer box 35 defined by the wall 36 and the cover flange (or end flange) 37; internally received filter construction 40, generally defined by filter means 41 extending between upper and lower end layers 42 and 43 respectively and positioned between external and internal liners 45 and 46 respectively; the internal board 50; cover piece 51 and inner spring 52. In the case 35, the wall 36 and the flange 37 are secured together along a seam of the peripheral seam or roll 38. In service, the fluid to be filtered is directed to the region 60 by passage through the opening 61 in the cover 51. That is, the flow of the fluid through the inlet conduit 16 is directed to the space 70 between the cartridge 5 and the base 4 of the filter and then either under pressure applied in the direction of arrow 75 or under suction pull in the direction of arrow 76, fluid is directed to region 70, through opening 61 and region 60. Then, the fluid flow is directed to through the construction 40 of the filter, in the direction indicated generally by the arrows 78 to the internal volume 79 defined by the inner liner 46. After having been so filtered, the fluid is then directed to the section 26 of the duct in the post central 25, in the general direction ind It is moved by the arrow 79 through the conduit 20 and out of the base 4 of the filter in the direction generally indicated by the arrow 76. Selected specific sizes and shapes of the conduit in the base 4 of the filter are used to accommodate couplings and for facilitate the flow of fluid. An arrangement constructed with the flow of the fluid as shown in Figure 2, that is, from an outer or outer liner 45 through the inner liner 46, during filtration, is generally referred to as a "direct flow" arrangement. It will be noted that seal arrangements as defined herein may also be used in association with various "reverse flow" arrangements, in which the fluid flow moves in an appropriate direction through the filter array 40; that is, from an interior to an exterior of the filter media.

Within the volume 77 defined by the external side wall construction 35, a spring 52 is included which drives the filter array 40 against the seal 50 and as a result, the seal 50 against the cover 51. As a result of this impulse and configuration of the the seal 50, a seal is provided to inhibit the flow of the filter between the seal 50 and the post 25 and the seal 50 and the end cap 42. As defined so far, the filter cartridge 5 and the base 4 of the filter are generally conventional. Arrangements and features such as those described in U.S. Patents 4,369,113 and 4,743,374, incorporated by reference, may be used for example in an analogous manner. The present description. is concerned with unique features provided in association with a specific seal between the base 4 and the filter cartridge 5, as will be better understood by reference to Figure 3, an enlarged view of a portion of Figure 2. With reference to the figure 3, the base 4 of the filter includes a dependent or prominent wall structure (or skirt structure) 80 therein. In the embodiment shown, the structure 80 is a ring-shaped wall structure 81 that depends (projects) from the base 4 of the filter towards the filter cartridge 5. The structure 81 circumscribes and is spaced from the post 25. The ring-shaped wall structure 81 includes a sealing surface directed radially inwardly. The terms "radially" and "inwardly" in this context mean that the sealing surface 83, as it circumscribes the post 25, is directed towards (that is, it is facing) the post 25 and / or centerline or axis 87; the central axis 87 is generally a central axis of circular symmetry for the sealing surface 83. In the preferred embodiment, the sealing surface 83 has the following characteristics: it is machined to be generally planar in cross-section, Figure 3, in an extension of width and is of frustoconical configuration, with a line such as line 85 tangential to surface 83 extending at an angle of about 85 ° to 45 ° in relation to a plane (or line) such as a plane that includes the line 86 perpendicular to the central axis 87, FIG. 2, of the central post 25. Still with reference to FIG. 3, the filter seal 10 is spliced into a circular recess 90 defined by a portion of the can end 37. In particular, the can end 37 includes a segment 92 defining a gap between the outer wall 93 and the inner wall 94. The sealing ring 10 is configured to be spliced against the inner wall 94. That is, the sealing ring 10 the inner wall 94 is spliced and circumscribed. Note that the inner wall 94 includes an upper flange 95. The upper flange 95 is preferably of a size sufficient to extend partially, but not completely, normally not more than about 95% and usually around 75 to 90% over the sealing ring 10. For the preferred construction shown, the sealing surface 83 is configured and directed to engage with the ring 10 by compressing it against the wall portions 94 and the surface 90, FIG. 3, as the filter cartridge 5 is mounted on the base 4, for example when rotating on the threads 28, figure 2. The directions of compression are indicated generally by the arrows 98, 99, figure 3 and include a radial and axial character (or component). That is, the compression forces are partially axial and partially radial. Note, however, that in the preferred embodiment shown, no portion of the seal 10 is compressed between and against the end surface 100 of the structure 80 and the cartridge 5, during sealing. In addition, during sealing 80, structure 80 is positioned between sealing gasket 10 and outer wall 93. This is a preferred configuration, for reasons described hereinafter.

With reference to Figures 4 and 5, the end surface 120 of the wall 80 includes a plurality of spaced projections or protuberances 101 downwardly thereof. In the specific embodiment shown, three protuberances 101 spaced radially evenly (ie, spaced by 120 °) are shown. Each protrusion is preferably projected by a distance of about 0.025 cm (0.010 inches) to 0.25 cm (0.100 inches) from surface 120 in a direction toward cartridge 5 (when mounted). The protuberances 101 are also preferably part of the molded part of the base 4 of the filter. With reference to Figure 3, the protuberances 101 are sized and configured to provide a "hard" obstacle or seal to the movement of the filter cartridge 5 towards the base 4 of the filter during assembly. Preferably, the total surface area of the protuberances 101 that engage the filter cartridge 5 are not greater than about 0.19 square centimeters (0.03 square inches) to 0.64 square inches (0.10 square inches) for each protuberance and preferably, the The total number of protuberances is between 3 and 6. This will ensure that the surface contact area will be relatively small and thus will be relatively easy to obtain and decouple.

As a result of the configuration shown, good control over the assembly is obtained. The filter cartridge 5 is rotated (mounted) on the base 4 until it meets the retainer (preferably a hard seal as described). This is preferably a rigid coupling between the cartridge 5 and the base 4 of the filter, when the end 37 of the filter can is coupled with the protuberances 101. If the appropriate combinations of sizes of the protuberances are chosen, together and seal surfaces, you get a good seal. This is because the sealing surface 83 is directed towards the ring 10, such that as the protuberances 101 come into contact with the surface 90, the seal 83 compresses the ring 10 in the direction indicated by the arrows 98, 99, figure 3. Thus, a fluid-tight seal is obtained by simply choosing the appropriate dimensions for the various portions. In the sections presented hereinafter, sample dimensions are provided. From these, a wide variety of alternative sizes and configurations can be easily developed.

SAMPLE SPECIFICATIONS In this section, an example of a set of operating materials and specifications is provided. They are proposed as an example. A wide variety of alternative materials and sizes can be used. This specific example is for use as a fuel filter. The base 4 of the filter would be molded of aluminum in the configuration shown in Figures 1-5. The dimensions would be in general as follows: Box 5 is constructed of steel. The box 5 has an external diameter of approximately 10.79 cm (4.25 inches) and a length of approximately 17.78 cm (7.00 inches). The outlet tube of base 4 of the filter has an average internal diameter of approximately 2.54 cm (1.00 inches). The filtration means include an elaborate medium of cellulose fiber or synthetic fiber. These media have an efficiency of approximately 50% or particles of 5 microns and a typical life of approximately 250-500 hours of service. Installed in the arrangement of Figure 1, the media has an outer diameter of approximately 9.52 cm (3.75 inches) and an inner diameter of approximately 4.44 cm (1.75 inches). The end caps on the filter element are constructed of steel. The end cap 42 has an external diameter of approximately 9.65 cm (3.80 inches) and an internal diameter of approximately 4.32 cm (1.70 inches). The end cap 43 has an outer diameter of approximately 9.52 cm (3.75 inches). The spring 52 is a coil spring with approximately 4 turns. In an uncompressed state, Pier 52 has a length of 3.8 cm (1.50 inches), a diameter of approximately 3.8 cm (1.50 inches) and is constructed of steel for springs. Spring 52 has an installed force of 13.6 Kg (30 pounds). The wall structure 81 has an internal diameter of approximately 8.38 cm (3.30 inches) and an external diameter of approximately 9.75 cm (3.84 inches). It has a length of approximately 1.14 cm (0.45 inches). The surface 83 is at an angle of the surface 86 of about 70 °. The seal element includes a hardness measurement of approximately 70 durometers. The upper flange 95 has a width of about 0.20 cm (0.08 inches). The inner wall 94 has a length of approximately 0.762 cm (0.300 inches). The protuberances are projected at a distance of approximately 0.1016 cm (0.04 inches) from the surface 120. It is noted that, with respect to this date, the best method known to the applicant to carry out the aforementioned invention, is that it is clear from the present description of the invention.

Claims (23)

1. CLAIMS Having described the invention as above, the content of the following claims is claimed as property: 1. A filter arrangement comprising a filter base; the base of the filter includes a central post and a base wall that circumscribes the central post and spaced therefrom; said base wall has an inner wall portion directed towards the central post; characterized in that: (a) such inner wall portion of the base wall includes a sealing surface thereon; such a sealing surface is for receiving the compression of a sealing gasket when a filter cartridge is mounted thereon and (b) such a base wall includes an external shoulder with a plurality of protuberances thereon; such protuberances are for coupling with a surface of a filter cartridge when a filter cartridge is mounted thereon, the protuberances circumscribing the sealing surface. 2. A filter array according to claim 1, characterized in that it further comprises: (a) a removable and replaceable filter cartridge mounted on the filter base. 3. A filter arrangement according to claim 2, characterized in that: (a) the filter cartridge includes a seal seat thereon and an end wall part; (i) the end wall part has; a central recess or recess; an outer wall and an inner wall; the central recess and the inner wall define the seat for the joint. A filter arrangement according to claim 3, characterized in that: (a) each of the plurality of protuberances on the base wall project in a direction towards and in direct contact with the central recess or recess in the part of the end wall of the filter cartridge when the filter cartridge is operatively mounted on the base of the filter. A filter array according to any of claims 3 and 4, characterized in that it further includes: (a) a compressed seal between the sealing surface and the seal seat. A filter arrangement according to any of claims 2-5, characterized in that: (a) the central post of the filter base includes an external threaded surface and (b) the filter cartridge includes an internally threaded bore, dimensioned and configured to be received threaded on the central post. A filter assembly according to any of claims 2-6, characterized in that: (a) the filter cartridge comprises a filter for liquid with flow from an outer portion to an inner portion. 8. A filter arrangement according to any of claims 1-7, characterized in that: (a) the sealing surface of the base wall is frusto-conical; (i) the frustoconical sealing surface has a flat portion, in cross section, having a width; (ii) the flat portion, in cross section, extends at an angle relative to a plane perpendicular to a center line of the sealing surface. 9. A filter arrangement according to claim 8, characterized in that: (a) the width is in the range of approximately
2. 2. 54 - 19.05 mm (0.1 - 0.75 inches). A filter arrangement according to any of claims 8 and 9, characterized in that: (a) the angle is in a range of 45 to 85 °. eleven . A filter arrangement according to any of claims 1-10, characterized in that: (a) the base of the filter comprises a molded piece of metal. 12. A filter arrangement according to any of claims 1-11, characterized in that: (a) the external shoulder includes 3-6 protuberances. 1
3. 3. A filter arrangement according to any of claims 1-12, characterized in that: (a) the protuberances project to approximately 0.254 - 2.54 mm (0.010 - 0.1 inches) from the external shoulder. A filter arrangement according to claim 3, characterized in that: (a) the sealing surface is frusto-conical and the central post includes external threads thereon, the sealing surface is directed towards the central post; (i) the frustoconical sealing surface has a flat portion in cross section, having a width in the range of about 0.25 cm (0.1 inches) to about 1.9 cm (0.75 inches); (A) the flat portion, in cross section, of the frusto-conical sealing surface extends at an angle of about 85 ° to 45 ° relative to a plane perpendicular to a center line of the filter base; (b) the base wall is constructed and arranged to directly contact a portion of the central recess or recess in the end wall part, when the filter cartridge is mounted on the base of the filter; each of the plurality of protuberances projects in a direction towards the central recess or recess in the end wall part, when the filter cartridge is operatively mounted on the base of the filter; (ii) the filter cartridge includes an internally threaded bore, sized and configured to be threadedly received on the center post and (c) a compressed seal between the frusto-conical sealing surface and the seal seat. A filter arrangement according to claim 3, characterized in that: (a) the sealing surface is frusto-conical and the central post includes external threads thereon, the sealing surface is directed towards the central post; (i) the frustoconical sealing surface has a flat portion; (A) the flat portion extends at an angle relative to a plane perpendicular to a center line of the filter base; (b) the base wall is constructed and arranged to directly contact a portion of the central recess or recess in the end wall part, when the filter cartridge is mounted on the base of the filter; each of the plurality of protrusions projects in a direction towards the central recess or recess in the end wall part, when the filter cartridge is operatively mounted on the base of the filter and (c) a seal gasket compressed between the frustoconical sealing surface and the joint seat. 16. A method for sealing a filter cartridge to a filter base; the base of the filter has a central post and a base wall that circumscribes the central post and separated from it; the base wall has an inner wall portion directed towards the central post; the inner wall portion of the base wall includes a sealing surface thereon, characterized in that: the base includes an external shoulder with a plurality of protuberances thereon, the protuberances circumscribing the sealing surface; the method includes the stage of; (a) rotatably mounting the filter cartridge on a portion of the filter base, while compressing a seal joint therebetween; (i) the compression step comprises compressing the seal seal between the sealing surface on the filter base and the filter cartridge until direct axial contact is obtained between the protuberances on the base wall and a surface on the cartridge of the filter. 17. A method in accordance with the claim 16, characterized in that: (a) the rotatable mounting step includes rotating the filter cartridge on the filter base, while removing a recessed surface of the filter cartridge towards a frustoconical portion of the sealing surface of the wall of base. 18. A filter cartridge and gasket assembly, characterized in that it comprises: (a) a box having an end piece that includes a central recess or recess positioned between an axially directed external wall and an axially directed internal wall and (b) a seal gasket positioned within the central recess or recess and spliced against the axially directed internal wall; (i) the axially directed inner wall includes a flange that extends over at least a portion of the seal seal; (ii) the central recess or recess is configured to receive a wall of a filter base that applies radial and axial compression forces to the seal seal against the axially directed internal wall. 19. The filter and seal cartridge assembly of claim 18, characterized in that: (a) the seal has a substantially round cross section. The filter cartridge and gasket assembly according to claim 18 or 19, characterized in that: (a) the end piece includes a segment connecting the axially directed external wall and an axially directed internal wall; (i) the flange is parallel to the segment. 21. A filter arrangement comprising a filter base and a removable and replaceable filter cartridge mounted on the filter base; the base of the filter includes a central post and a base wall circumscribing the central post and spaced apart therefrom, the base wall having an inner wall portion directed towards the central post; characterized in that: (a) the filter cartridge includes a seal seat thereon and an end wall part, (i) the end wall part has: an annular recess and recess and an internal wall adjacent to the recess or annular recess; the annular recess or recess and the internal wall define the seat of the joint; (b) the inner wall portion of the base wall includes a sealing surface thereon, the sealing surface is for receiving compression of a seal within the joint seat in both axial and radial directions and ( c) the base wall has an end surface, the end surface is in direct contact with the wall part of the end of the filter cartridge, the end surface of the base wall circumscribes the sealing surface. 22. The filter arrangement according to claim 21, characterized in that the end surface of the base wall further comprises protuberances and the protuberances are in direct contact with the central recess or recess of the filter cartridge. 23. The filter array according to claim 21, characterized in that: (a) the sealing surface of the base wall is frusto-conical; (i) the frustoconical sealing surface has a flat portion, in cross section, having a width; (ii) the flat portion, in cross section, extends at an angle relative to a plane perpendicular to a center line of the sealing surface.