Abstract: In a bypass filter unit, in particular, for filtering supplies of hydraulic oil in a bypass flow, comprising a motor-driven pump and a fixedly mounted filter housing closeable by a cover and containing an exchangeable filter element, it is proposed that the drive of the pump, the pump and the filter housing be arranged coaxially with one another, with the end of the filter housing that is closeable by the cover pointing upwards, that the filter housing be directly connected to the pump, and that the filter housing form a receptacle for the clean oil while the filter element is being changed, so as to enable changing of the filter element and renewal of the filter in a simple way and without risk of soiling the clean oil side.

Abstract: The present invention is directed to a filter cartridge that provides for a secure dust tight seal and is easily inserted and removed from a filtration unit. The filter cartridge includes a cartridge unit having a filter element, a bottom cap and a top boot and a sealing sleeve for insertion into the interior of the top boot. The top boot has an outside diameter which is slightly smaller than the inside diameter of the opening in a tube sheet into which the filter cartridge is to be inserted so that the cartridge may be easily inserted into and removed from the opening in a tube sheet. The top boot is also provided with a sealing ridge, which is located in the inside of the boot at the sealing point. The inside diameter of the sealing ridge is smaller than the cartridge boot and the sealing sleeve. When the sealing sleeve is inserted into the cartridge boot, the sealing sleeve contacts the sealing ridge and causes an increase in diameter of the sealing ridge.

Abstract: The vacuum filtration device has a disposable filter funnel and a disposable filtrate receptacle. The funnel and receptacle are used with a reusable base that is connected to a vacuum source. When the receptacle and funnel are mounted on the base the vacuum is applied through a connecting passage to the receptacle to draw the filtrate from the funnel into the receptacle.

Abstract: A fluid filter has separable upper and lower housing portions releasably joined in assembled relation wherein the lower housing portion closes the open lower end of the upper housing portion to form a fluid inlet chamber in the upper portion communicating with an unfiltered fluid inlet in the lower portion, and removable filter cartridges mounted on the upper end of the lower housing portion within the fluid inlet chamber in the upper portion and internally communicating with a filtered fluid outlet in the lower portion. The upper housing portion is separable from the lower housing portion to uncover the full lengths of the filter cartridges in a manner which facilitates periodic removal and replacement of the cartridges for cleaning or replacement of damaged cartridges and permits close inspection of the sealed ends of the cartridges to assure proper sealing of replaced cartridges to the lower housing portion prior to reassembly of the housing portions.

Abstract: A filter arrangement comprises a filter head and a filter body. The filter body and filter head are provided with components arranged to cooperate with one another to permit the filter body to be secured to the filter head by sliding the filter body in a lateral direction thereof relative to the filter head.

Abstract: Membrane element consisting of carrier disk and membrane cushion for filtering and separating flowing media, especially in devices for filtering and separating fluids by membrane techniques. Aim of the membrane element according to the invention is the essential reduction of the losses of pressure inherent to the modules by eliminating the sharp redirections of the flow by the usual carrier disks and membrane cushions in plate modules. This is achieved by a circular guidance of the flow of the fluid to be separated between carrier disk and membrane cushion. The carrier disk according to the invention is provided with a slit-like passage so that, after a concentric, circular flow over the carrier disk and the corresponding membrane cushion, a guidance of the flow to the next carrier plate level with the correspondingly formed membrane cushion is made possible with minimal loss of pressure and almost without redirections.

Abstract: A filter for filtering lubricating oil or fuel for an internal combustion engine is disclosed herein. The filter includes a filter housing having an inner end for connection to a connection flange associated with the internal combustion engine and an outer end connected to a detachable cover. The inner end of the housing includes a filter inlet duct, a filter return duct, and a plurality of coaxially spaced radial filter seals for providing a seal between the filter housing and the connection flange. The connection flange includes a connection inlet duct in matching registry with the filter inlet duct, a connection return duct in matching registry with the filter return duct, and a plurality of coaxially spaced sealing surfaces each in matching registry with a respective one of the radial filter seals. A locking connection is provided for securing the filter housing against the connection flange at a plurality of said angular positions with respect to the connecting flange.

Abstract: A filtration apparatus for deadend filtration is provided which is formed from multilayer presealed elements and monolayer elements that are insert molded together. The device is provided with a feed port, and a filtrate port. The sealing configuration of the presealed elements and the seal provided by the insert molding step effect a seal configuration that causes a feed liquid to be filtered to form a filtrate such that the filtrate is not mixed with the feed.

Abstract: A fuel filter assembly (10) has a head portion (12) and an element portion (14) enclosing a replaceable cartridge (18). The assembly has a first inlet port (22) which accepts fuel from a tank (90) and filters it by passage through a screen (43) supported on a tube (36). The fuel that has been filtered by passage through the screen is delivered from the assembly through a first outlet port (24) for delivery to a lift pump (96). Fuel from the lift pump is returned to the fuel filter assembly through a second inlet port (26). The fuel is finely filtered by passage through a loop of filter media (60). Clean fuel is delivered from a second outlet port (28) to an engine (104). Contaminants separated from the fuel by passage through the screen and the media loop are collected in first and second sump areas (78), (80) of the filter housing respectively. An alternative embodiment (110) includes a prefilter screen (158) integral with a replaceable cartridge (118).

Abstract: The present invention provides a device with a filter bag for separating a liquid phase from a suspended solid phase in a biological fluid.

Abstract: A spin-on filter including an improved baseplate preferably die cast from aluminum provides an inventive outer gasket retaining groove. The baseplate comprises a hub joined to a rim by ribs. The rim provides a generally cylindrical wall and a seating surface extending radially outward therefrom. The cylindrical wall defines an inner vertical wall for the outer gasket retaining groove. Horizontal ribs extending from the top of the wall provides an inventive retaining device for securing and aligning an outer gasket in the retaining groove. The inventive baseplate can be used in filters with or without a seaming lid. The present invention improves the fastening technique for both types of aluminum in the baseplate filters.

Abstract: A seal arrangement for a fluid filter assembly which is constructed and arranged to threadedly mount onto an engine block mounting base includes an inner seal and an outer seal. The fluid filter assembly includes an outer shell, a filtering element located within the outer shell and defining therewith an annular clearance space. The fluid filter assembly further includes a nutplate which is anchored to the outer shell and which includes an internally-threaded center aperture for threaded engagement onto the engine block mounting base. The inner seal is positioned between the nutplate and the filtering element and cooperates with the nutplate in order to provide a plurality of flow paths between the inner seal and the nutplate from the engine mounting base to the annular clearance space. The outer seal is positioned between the engine block mounting base and the nutplate and includes a pair of spaced-apart ribs which provide a sealing interface against the engine block mounting base.

Abstract: In a fuel filter module for introducing fuel from a fuel inlet into a casing and for removing foreign matter from the fuel by passing the fuel through a fuel member and for discharging the fuel through a fuel outlet to the outside of the casing, and the casing is formed to have a D-shaped cross section. With this construction, the outer diameter of the casing is not increased even when an accessory is assembled on the outside plane wall of the D-shaped casing. The casing accommodates a filter member of C-shaped cross section. The center of a C-shaped sealing member provided for sealing the upper edge of the filter member is offset from the center of the casing. By thus offsetting, sufficient areas for fuel inlet and outlet can be ensured without increasing the size of the casing.

Abstract: A retaining ring assembly for a reverse osmosis filter cartridge includes a removable retaining ring inserted into the cartridge housing after insertion of the cartridge, the retaining ring including a demountable locking connection with the housing. When the housing is subsequently removed to replace the cartridge, the retaining ring forces the cartridge from its tightly sealed connection to the end cap or header, allowing the cartridge to be easily removed with the housing. Preferably, the housing includes a special brine ring adapted to cooperate with a conventional cartridge brine seal, the brine ring providing connection for the retaining ring and defining with the housing a brine flow passage.

Abstract: A water purifier includes a quick connect connector in a port that receives a tube that carries the water. The tube is received along the axis of the port in a first reference direction along the axis. The connector is assembled by inserting, in sequence, a support ring, an O-ring, and a plug into the port along the axis, but in a direction opposite the first direction. The plug is held in place by adhesive or conventional welding. To complete the assembly, a collet is inserted into the port along the axis and in the first direction. A tube is then connected to the water purifier by urging the tube through the collet, along the axis, and in the first direction. The tube is gripped by the collet, supported by the support ring, sealed by the O-ring, and stopped against the plug.

Abstract: A filter arrangement for filtering fluid comprises a housing having an inlet and an outlet, a first cylindrical construction, a second cylindrical construction, and a bypass arrangement. The first construction includes filter media mounted within the housing. The first construction defines a first open filter interior. The first open filter interior includes a first dimension being a largest dimension across a cross-section of the first open filter interior. The second construction includes a filtration construction mounted within the housing. The second construction defines a second open filter interior. The second open filter interior includes a second dimension being a largest dimension across a cross-section of the second open filter interior. The second dimension is at least as large as the first dimension. The bypass arrangement has an open position and a closed position.

Abstract: An assembly for extracting analytes from a sample using a fluid under pressure, and embodying the invention, includes an extraction cell receiving the sample and having a chamber body closed at one end by a translatable slide block assembly in fluid communication with the fluid under pressure to introduce the fluid under pressure into the sample located within the chamber body; and a cylinder block assembly at the opposite end of the chamber body for extracting the fluid passing through the sample, the sample being enclosed in a vessel having a thimble body closed at opposite ends by pressure-fit end cap assemblies, each having a thimble cap, a seal, and a frit cap assembly for retaining the sample within the thimble body and permitting the passage of the fluid therethrough.

Abstract: An engine oil filter has an upper cap and a lower case or plate, which are engageable with each other through a projecting portion and a groove portion. In one mode, the projecting portion is inserted into a first longitudinal groove wall and moved along a contact surface of a first skewed groove wall, whereby the cap and the case are moved and fitted together in an axial direction. As axial movement caused by relative rotation between the cap and the case takes place, an O-ring is tightly fitted therebetween at a fixed seal position. This engagement process applies no excessive force to the O-ring so that a sealed state of high reliability is provided.

Abstract: A filter and filtering cartridge with a removable center tube, for the filtering of fluids. The invention relates to a filter for circulating fluid of the type consisting of a filtering cartridge inserted in an outer shell, with the outer shell being intended to be removably connected to a base. The outer shell cooperates with an independent and removable center tube. A filtering cartridge is mounted in the outer shell around the independent and removable center tube which extends longitudinally inside said outer shell over at least a substantial part of the length of the outer shell. The filtering cartridge is longitudinally restrained inside said outer shell in part by the removable center tube.

Abstract: Disclosed is a housing for a reverse osmosis filter. The housing is preferably cylindrical and features a unique sealing assembly at each of its ends. The end assemblies enable the interior of the housing to be readily accessed and securely sealed. Each end assembly can be provided with one or more inlet and/or outlet ports.

Abstract: An air gap adapter for use with a water faucet. The air gap adapter has an adapter body with a base portion and an integral riser portion which extends generally vertically upwardly from a rear region of the base portion. The base portion has a hole for a water inlet shank of the water faucet, and the riser portion has brine inlet and outlet bores. The brine outlet bore is vertically oriented in the riser portion, and the brine inlet and outlet bores are open at their upper region. Two barbed connectors are located at a lower region of the adapter body and provide a brine inlet and outlet to the adapter. A venting aperture is formed near an upper region of said riser portion and passes into the brine outlet bore. A cap is positioned on the riser portion above the bores.

Abstract: A filter element for use in a pan, such as a oil pan for a vehicle transmission or internal combustion engine, is configured for positioning in the opening of a sump in the pan. In order to position the filter element, an inwardly projecting shoulder is provided on the wall of the sump upon which a shoulder on the frame of the filtering elements rests. Between the two shoulders a resilient seal is positioned and held compressed by a latching arrangement on the filter element. A preferred latching arrangement comprises plurality of detents that project laterally from the filter element frame and seat within indentations in the wall of the sump. Preferably, the filter element has a pleated filter media.

Abstract: A fuel filter assembly (10) includes a housing (12) with an internal chamber (14) and inlet and outlet (18, 22). The chamber is bounded by an annular wall (16) and has an opening (30) at an upper end thereof. An element (26) is accepted in the chamber. The element includes a manually engagable cap portion (28) for closing the opening, and a disk-shaped member (46). The disk-shaped member has a deformable lip portion (50) for engaging the annular wall, and for fluidly separating an aperture (24) in connection with the outlet fitting, from aperture (24) in connection with the outlet fitting, from an aperture (20) in fluid communication with the inlet fitting. A check valve (200) is also engaged by the lip portion to open a fluid path to the chamber when the filter element is located in the housing. A media body (54) of filter media (56) removes impurities from liquid flowing therethrough. Fuel flows from the inlet to the chamber and then through the media.

Abstract: A filter cartridge for purifying fluids such as water and chemicals is provided with sealing rings integrally formed with and extending circumferentially from a tube connected to the housing of the filter cartridge and intended to be inserted into a receptacle for providing or receiving fluids. The rings are elastic and compress when the filter cartridge is inserted into the receptacle, thereby providing a seal between the filter cartridge and the receptacle.

Abstract: A filter retainer for a vacuum cleaner includes a filter cage having several ribs. At the bottom of the filter cage is a lip which includes a plurality of notches. A cylindrical filter having open ends is slid over the filter cage. A cap is placed at the bottom of the filter in order to hold the filter to the filter cage. The cap has a pair of ramps which engage notches on the rim of the filter cage. As the cap is rotated, the cap is pushed towards the filter so that a lip on the cap engages a bottom of the filter.

Abstract: A reusable fluid filter assembly comprises a cylindrical housing, a top plate assembly, a top plate attachment member, and a replaceable coreless filter element. The housing has means for removably connecting the housing to the top plate, and a hollow central core having an open first end and being connected to the closed end of the housing at the second end. The central core has a plurality of fluid outlet perforations. The top plate has a rim, fluid inlet means and fluid outlet means extending through the top plate. The top plate attachment member has a tubular shape, and a fluid outlet port extending through it. The coreless filter element having annular end caps on first and second open ends is disposed in the housing. The fluid inlet means of the top plate are in fluid communication with a fluid inlet chamber defined by the filter element and housing. The central core extends into the first open end of the filter and the hollow cylindrical chamber of the filter element.

Abstract: Apparatus for filtering industrial liquids and gases by separation of suspension particles based on the principle of radial stationary filtering. The filtering apparatus comprises a cover (9), a body (6) and a base (19) whose volume is adjustable by altering the length of its body (6). A threaded rod is provided for sealing the unit and also for providing a sealed joint between a filter element (4), the cover (9) and the base (19). The threaded rod (2) can be tightened and untightened using a butterfly handle (11) without the use of other threaded connections. Depending on the liquid or the gas to be filtered, the filter medium will be made from towel-type paper or felt. The filter elements (4) come in a single size and a spacer device (22) is used to provide different lengths. The liquid or gas to be filtered is conveyed by a conical transmission conduit (16) past a circular rib (13) into the outer peripheral zone of the filter chamber (5).

Abstract: A liquid filtering apparatus includes a hollow cylindrical accommodation member having external screw threads at respective ends. Connecting members are disposed at respective ones of those ends, and each connecting member possesses a passage to enable liquid to flow through the accommodation member. Each connecting member is adapted to be connected to a water pipe and is retained on the accommodation member by a respective lid member which is threaded onto a respective end of the accommodation member. A filter disposed inside of the accommodation member is in the form of a cylindrical perforated net and a panel extending across one end of the net to resist radial crushing of the net when the filter is removed and is being cleaned.

Abstract: The fuel filter/regulator assembly comprises a cylindrical body open at one end and closed at its opposite end by an annular wall having a pocket for receiving the regulator. The annular fuel filter is received in the body and has an inner end cap configured to bear against and receive an upper portion of the regulator. A further end cap closes the open end of the body and bears against the fuel filter element. A fuel inlet is provided and all components of the housing are formed of stainless steel. In another form, a wave spring is employed to accommodate stack-up tolerances of the fuel filter.

Abstract: A fluid filter which comprises a canister having an open end and a closed end, the canister sealing to an adapter body to prevent leakage between the canister and the adapter body, the adapter body having a plurality of angled fluid inlet ports extending through the adapter assembly body into the cavity formed by the canister and the adapter body assembly, a threaded fluid outlet port extending through the adapter body, a threaded ring adapter for adapting the outlet port to a variety of filter receptacles, a multistage wire mesh filter element having a weave which is designed to prevent fluid contaminants from passing through the filter element while inhibiting the contaminant particles from becoming lodged in the filter mesh, the fluid inlet ports in the adapter body being formed at an angle to create a tornado type turbine fluid motion within the canister to suspend contaminants which are blocked from passage through the screen in the fluid and allow such contaminants to settle in the canister out of the f

Abstract: A filtration apparatus is provided which is formed from multilayer presealed elements and monolayer elements that are insert molded together. The device is provided with a feed port, a filtrate port and, optionally, a retentate port. The sealing configuration of the presealed elements and the seal provided by the insert molding step effect a seal configuration that causes a feed liquid to be filtered to form a filtrate such that the filtrate is not mixed with either the feed or a retentate.

Abstract: A filter including a first flow path having a plurality of interconnected channels and a second flow path having a plurality of interconnected channels. The channels of the first and second flow paths are alternatingly configured in a substantially concentric pattern. A filter media is interposed between the channels of the first and second flow paths. A filter including a filter media arranged in a plurality of substantially concentric layers; a fluid outflow system contacting the entirety of one side of the filter media, and a fluid inflow system contacting the entirety of an opposite side of the filter media.

Abstract: An improved oil reclamation device for removing solid contaminates and water or other volatile contaminates from the engine lubricating oils and hydraulic fluids. More particularly, this oil reclamation device relates to a unique combination evaporation chamber and filter housing, and to an improved filter assembly. A first feature of this oil reclamation device is the improved utilization of space through the efficient combining of the filter and evaporation chambers within one compact housing, which utilization brings the benefits of a compact installation with a minimum difficulty of installation. Another benefit of this design is the efficient use of engine oil to heat the evaporation surface evenly and effectively without the need of any additional heat source. This design eliminates cold spots on the evaporation surface and the need for potentially dangerous heating elements. Further, many different types of filter elements and filtration ratings may be used.

Abstract: A spin-on type filter assembly for lubricating oil includes a cast aluminum housing which contains a replaceable annular filter element. The filter element is resiliently retained in the housing by compressing a gasket thereon with a threaded end cap which closes one end of the housing. The housing includes a unitary front end wall with a plurality of inlet ports surrounding an axially positioned outlet port. In order to provide a secure coupling with the engine, an externally and internally threaded steel stud is threadably mounted in the outlet port for threadably coupling with the engine.

Abstract: A one-piece plastic injection molded filter housing has a first end and a second open end. An injection molded end plate member includes a circumferential annular flange, and an inward annular projection. Opposing, one-piece plastic upper and lower end caps include spaced flanges to receive the respective ends of a filter media therebetween. The upper end cap also includes an upper annular projection. The upper end cap is mechanically, removably connected to the end plate member via corresponding threads or a protuberance/recess interference fit combination. The end plate member is fixedly connected to the housing via a rib that fits into a recess on the housing via an interference fit, or by spin welding. The method for manufacturing the filter includes the following steps: connecting a plastic upper end cap to the media to form a media element; removably, mechanically connecting the upper end cap to the end plate member; and fixedly connecting the end plate member to the second end of the housing.

Abstract: A spin-on water-separating fuel filter has a built-in central drain tube for providing a sump port at the connection end of the spin-on filter located near the fuel inlet and fuel outlet ports. Water removed from the fuel is collected in a sump at the base of the filter. The drain tube, supported in the bore of the filter element, has a sump end projecting into the sump, and an outlet end adjacent to and aligned with a central threaded opening at the connection end of the filter. The outlet end of the drain tube, self-centered near the threaded opening, has a captured gasket which forms the sump port. When the filter is installed on the mounting head, the outlet end of the drain tube is coupled to a short stub tube projecting from the center of the central threaded neck to form a sealed passage for evacuating water from the sump.

Abstract: A device for filtering fluids which is cleanable and re-usable is described. The device includes a cylindrical canister, a cylindrical lid and a filter cartridge. The device is adapted to be disposed in a fluid flow circuit, filtering particulate from the fluid circulating therein. The filter cartridge is quickly removed, cleaned and reused. The fluid enters and exits the device from the top end through fluid inlets and an outlet extending through the lid perpendicular to the lids upper planar surface, thereby reducing the amount of space required to mount the device. The fluid inlets include sloping fins that direct fluids in the filtering chamber in a spiraling action, thereby increasing the effectiveness of the filter.

Abstract: The present invention is an improved method of employing a wet/dry vacuum cleaner for wet material pick-up. By employing a hydrophobic and air permeable filter material, such as an expanded polytetrafluoroethylene (PTFE), with a tight gasket around its edge in place of a conventional wet/dry vacuum filter, it has been determined that the filter can be retained in place at all times during operation, regardless of the material being collected.

Abstract: A filter assembly having a replaceable coalescing filter in which contaminants are separated from fuel, oil, or the like. The filter assembly has an outer housing that may be constructed from a cylindrical metal container and a top metal plate. A filter element is attached in a cantilever manner to the metal plate, by chemical bonding and/or mechanical locking, solely by way of an support member. The filter element is thus suspended from the plate leaving a clearance space between the bottom filter cap and the bottom of the filter container. No elements are disposed in the clearance space, thus maximizing the efficiency of the filter. The support member may be made of rubber or similar material suitable for sealing the inner and outer fuel chambers and for chemically bonding to the metal housing. The upper end cap of the filter element also may be chemically bonded to the element support.

Abstract: A filter (102) for filtering fluid from a machine (104) includes a filter housing (106, 250) having a first inlet (114) receiving a first fluid from the machine, a first outlet (116) returning the first fluid to the machine, a second inlet (118) selectively receiving a second fluid from a source (120) of cleaning fluid, and a second outlet (122) for exhausting the second fluid and for exhausting the first fluid from the dirty side of the main filter element (124) in the housing backwashed by the second fluid. The filter housing has a first flow path (126) therethrough from the first inlet then through the filter element in one direction then to the first outlet, and has a second flow path from the second inlet then through the filter element in the opposite direction then to the second outlet, the first and second flow paths having common but opposite direction portions through the filter element. A second filter element (156) is provided in the second flow path.

Abstract: A filter assembly has a housing accommodating a filter element. One end cap of the filter element has a generally annular body with support fins projecting from one surface. A peripheral flange extends from the edge of the body and is spaced from the outer ends of the fins to allow differential expansion of the flange without undue stress. The flange carries two opposed sets of pegs for supporting respective sealing rings to allow the flange to seal between parts of the housing.

Abstract: A plastic oil filter comprises a cup-shaped shell with an open end. The shell contains an annular filter media with an elongated opening therethrough. A backplate is positioned in the open end of the shell. An elongated core is positioned in the opening in the filter media. The core is hollow and has a plurality of openings in the walls thereof. A plurality of longitudinally spaced annular rings are formed on the outer surface of the core. Fluid to be filtered can pass through openings in the backplate into the space between the shell and the filter media, through the filter media to be filtered, through the openings in the walls of the core, into the flow passage in the core, and exit from the filter through the flow passage in the core. Sealing washers are provided at each end of the filter media for preventing undesired flow between the core and the ID of the respective sealing washers. Spring structure is formed on the core.

Abstract: The invention relates to a liquid filtration device, comprising a substantially cylindrical housing one end of which is closed and the other end of which is connected to a head provided with an inlet and an outlet, a filtration element being provided within said housing. According to the invention the housing is formed by a tube section of the desired diameter and cut at the desired length, said tube section being closed, at its end opposite from the head of the filtration device, by a bottom piece inserted therein with a sliding fit, the outer circumferential face of said bottom piece being sealed to the corresponding part of the inner circumferential wall of the tube section by means of at least one O-ring engaged in a corresponding groove, while the bottom piece end opposite from the head of the filtration device bears on a snap ring Provided within an inner circumferential groove of the tube section.

Abstract: A fuel filter assembly includes a housing (12) with a removable element (24) mounted therein. The housing has an inlet port (14) in direct fluid communication with a chamber (18). The outlet port (16) is in direct fluid communication with a central standpipe (22). The standpipe has a flow element (42) movable therein for controlling the condition of flow openings (36) in the standpipe. The element includes projections (88) for engaging recesses (90) in a cover (28) to selectively latch the element and cover together. The cover further includes a cover projection (82) for supporting a projection (78) on end cap (60) of the filter element, which opens flow into the standpipe only when the element is installed. When the element is removed, the flow element prevents the introduction of contaminants into the standpipe.

Abstract: An improved filter assembly is provided using a bag-type vessel shell and a removable adapter assembly that contains multiple filter cartridges. The invention can be used with both double-open-end filter cartridges and single-open-end filter cartridges. In either case, both ends of the filter cartridges are held in place by individual positioning guides, so as to maintain a perpendicular orientation and seal integrity. In all cases, a knife-edge end seal is provided to be forced into the end surfaces of the filter cartridges. In one embodiment, a compression plate is provided with a single coil spring to force the multiple knife-edge end seals against their respective filter cartridges. In a second embodiment, individual floating end seals are provided at the compression plate to provide good seal integrity regardless of variations in length of the individual filter cartridges.

Abstract: A fuel filter cartridge is formed from a pair of shell sections which are joined along a roll seam to form a retaining shoulder. The sections have generally cylindrical walls which are symmetric about a central axis. One of the sections has a diameter greater than the other section. Angularly spaced arcuate protrusions or keys protrude radially from the cylindrical wall of the cartridge.

Abstract: A dual media fuel filter which combines the functions of filtering the fuel passing from a fuel source to a lift pump, and the function of filtering the fuel passing from the lift pump to the fuel injectors. The present invention provides a fuel pump with distinct primary and secondary fuel filter cartridges which are compression loaded into a self-contained oil filter canister adapted for threaded attachment to an engine block. The primary filter cartridge is provided to filter fuel drawn under suction from a fuel source into a lift pump, and is therefore provided with a relatively coarse filtering medium to allow for adequate fuel to pass therethrough even under negative pressure and cold temperature conditions. The secondary filter cartridge is provided with a relatively fine filtering medium to filter the fuel passing from the lift pump and into the fuel injectors.

Abstract: A reusable fluid filter assembly includes a cylindrical housing, a top plate assembly, a top plate attachment member, and a replaceable coreless filter element. The housing has means for sealingly engaging the housing to the top plate, and a hollow central core having an open first end and being connected to the closed end of the housing at the second end. The central core has a plurality of fluid outlet perforations. The top plate has a rim, fluid inlet means and fluid outlet means extending through the top plate. The top plate attachment member has a tubular shape, and a fluid outlet port extending through it. The coreless filter element having annular end caps on first and second open ends is disposed in the housing. The fluid inlet means of the top plate are in fluid communication with a fluid inlet chamber defined by the filter element and housing. The central core extends into the first open end of the filter and the hollow cylindrical chamber of the filter element.

Abstract: A replaceable filter cartridge for use in a fluid filter assembly includes a substantially cylindrical filter element including a pair of oppositely disposed filter element ends. A first endplate is bonded to one of the filter element ends so as to close the end and prevent fluid leakage therethrough. A second endplate is bonded to the opposite filter element end so as to close the opposite end and prevent fluid leakage therethrough. The second endplate includes an outer annular wall which is sized so as to create a noticeable distance of separation between the second endplate outer wall and the outer surface of the filter element and thereby define an annular clearance space therebetween. The outer wall of the second endplate is annular and substantially concentric with the filter element and provides a lip or free edge for the snap-on assembly of a closing lid member.

Abstract: A filter comprises a housing having a container and cover which enclose a filter element. The container includes a hollow central post which extends upwardly from the base of the container. The upper end cap for the filter element includes a base supporting the filter media and a cylinder extending downwardly within the central cavity of the filter media. A first seal is provided around the periphery of the upper end cap to seal the intersection between the container and the cover. A second seal on an upwardly-extending flange on the upper end cap seals against a corresponding downwardly-extending flange on the cover. A plurality of slots in the base of the upper end cap provide a flow path from an inlet on the cover to the upstream surface of the filter media. The lower end cap also includes a base supporting the filter media and a cylinder extending upwardly within the cavity of the filter media and defining a central lower opening for receipt of the central post.