Abstract: A method and apparatus for filtering a slurry utilizing a displacement filtering principle. The filter apparatus desirably includes an inner filter and an outer filter. Both the inner and outer filters are preferably substantially annular in shape and positioned concentrically with respect to each other. A particulate collection volume is at least partially defined between the inner and outer filter. The method includes directing a flow of slurry into the particulate collection volume under sufficient pressure to force fluid within the particulate collection volume through one of the inner and outer filters and any particulate matter blocking a filtering surface of the inner and outer filters.

Abstract: An open flow fluid filter has a pleated main filter element having a plurality of pleats in a closed loop having an outer perimeter defined by a plurality of outer pleat tips, and an inner perimeter defined by a plurality of inner pleat tips. The loop has a hollow interior extending along an axis. Fluid to be filtered flows through the main filter element from an upstream dirty side to a downstream clean side, and flows axially in the hollow interior. The main filter element has an axial flow passage extending along the axis and circumscribing the hollow interior and has a flow perimeter greater than the inner perimeter. A safety filter element downstream of the main filter element filters both the axial flow in the hollow interior and additional flow between the flow perimeter and the inner perimeter. A filter with additional flow is also provided.

Abstract: A multiple stage fuel strainer assembly for a fuel tank in a vehicle includes a strainer adapted to be connected to an inlet of a fuel pump disposed in the fuel tank. The multiple stage fuel strainer assembly also includes a valve connected to the strainer to allow fuel to flow through the strainer to the inlet when an external surface of the strainer is restricted with contaminants in the fuel.

Abstract: A disposable extended sump line having a pump end and a mouth end for removing water from a barge or other container. The mouth end has a double layered strainer basket covering its entrance. The pump end preferably has a valve which may be opened to introduce water into the sump line from above. The pump end of the line is also configured to connect to a pump, so that suction may be applied. The double layered strainer basket will keep the cargo away from the mouth end of the sump line and prevent clogging. By adding water to the sump line through the valve, the sump line may be primed quickly. Finally, by making the sump line from disposable materials, the problems of damage to the sump line during unloading may be overcome by simply discarding the sump line and replacing it with another before reloading.

Abstract: A sleeve or wrap that fits over a cartridge type filter whereby enhancing the effectiveness of that filter. A preferred embodiment of the invention is to fabricate this sleeve or wrap using the category of material commonly referred to as “nonwoven” taking advantage of one or more of the functional properties possible with the composition of this material such as the ability to capture large debris, filter out chemical elements, absorb oils and many other advantages beneficial to the filtering process. This sleeve or wrap may be fabricated as a one piece tube that slides snugly over the filter. Supplied as a blanket or wrap with a thin strip of hook material along one edge similar to that used in a “Velcro tm” hook and loop fastening system and with the nonwoven material of the wrap acting as the loop so the wrap may be fit snugly over a broad range of diameter filters.

Abstract: A concentric arrangement of bag-type filter sleeves 11, 12 of a filter insert are removably supported within a concentric arrangement of screens 60, 61 of an annularly-shaped basket 10a. The screens respectively support the filter sleeves against radial flow during filtration. A filter cartridge 37 is carried interiorly of the innermost filter sleeve and is configured to filter the liquid that has first been filtered in the filter insert and before the liquid can exit the filter vessel 30.

Abstract: A filter insert includes a plurality of annularly-shaped, bag-type filter sleeves (111, 112, 113) concentrically-arranged. The ends of the sleeves are attached to the flanges of an inlet plate 114, an annular terminal plate 124 or a circular terminal plate 121 (e.g. by ultrasonic welding). The filter insert is removably placed within a basket such that concentrically-arranged screens (160, 161, 163) of the basket support respective filter sleeves against radial flow during filtration.

Abstract: A bottle mountable filtration system typically includes a plurality of different filter elements or filtering and treatment elements having a substantially common central axis that are mounted to extend into a bottle from a cap with a manual valve. Mounting structures may be provided, by screw threads, or by an interference fit, and connect the filter treating elements to the cap. An outer filter treating element may comprise a chlorine removal primarily radial flow outer filter, and an inner treatment element comprising a flavoring, vitamin, mineral, or medication adding component including a mixing chamber which provides an axial flow chamber radially surrounded by the flavoring, etc., adding component. Conversely, the inner treatment element may be a radial flow carbon composite filter used independently or in conjunction with one of several independent outer water treatment elements which may be radial or axial flow in design for the removal of a variety of biological, organic, or inorganic contaminants.

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 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 connection configurations, 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 multiple stage fuel strainer assembly for a fuel tank in a vehicle includes a strainer adapted to be connected to an inlet of a fuel pump disposed in the fuel tank. The multiple stage fuel strainer assembly also includes a valve connected to the strainer to allow fuel to flow through the strainer to the inlet when an external surface of the strainer is restricted with contaminants in the fuel.

Abstract: A filter element assembly has at least two cylindrically shaped and concentrically arranged filter media sleeves each connected at one end thereof to an inlet plate and each connected at the other end to a closed end terminal plate. Openings are provided in the inlet plate to permit entry of liquid to be filtered into the annular space between the filter sleeves. The closed end terminal plate prevents flow of unfiltered liquid from the annular space between the sleeves so as to force the liquid through the porous media of the sleeves to effect filtration.

Abstract: A filter element assembly has at least two cylindrically shaped and concentrically arranged filter media sleeves each connected at one end thereof to an inlet plate and each connected at the other end to a closed end terminal plate. Openings are provided in the inlet plate to permit entry of liquid to be filtered into the annular space between the filter sleeves. The closed end terminal plate prevents flow of unfiltered liquid from the annular space between the sleeves so as to force the liquid through the porous media of the sleeves to effect filtration.

Abstract: A filter element assembly has at least two cylindrically shaped and concentrically arranged filter media sleeves each connected at one end thereof to an inlet plate and each connected at the other end to a closed end terminal plate. Openings are provided in the inlet plate to permit entry of liquid to be filtered into the annular space between the filter sleeves. The closed end terminal plate prevents flow of unfiltered liquid from the annular space between the sleeves so as to force the liquid through the porous media of the sleeves to effect filtration.

Abstract: A filter element assembly has at least two cylindrically shaped and concentrically arranged filter media sleeves each connected at one end thereof to an inlet plate and each connected at the other end to a closed end terminal plate. Openings are provided in the inlet plate to permit entry of liquid to be filtered into the annular space between the filter sleeves. The closed end terminal plate prevents flow of unfiltered liquid from the annular space between the sleeves so as to force the liquid through the porous media of the sleeves to effect filtration.

Abstract: A self-cleaning fuel oil strainer, coupled to a continuous fuel flow, that includes a pair of canisters, each having a cylindrical wedge wire fuel oil filter screen. An elongated brush running the length of the screen is disposed between two confining walls also running the length of the screen to form a chamber. A elongated partition, including two sets of apertures, is used, along with the elongated brush, to divide the chamber into two particulate dislodge chambers and a drain subchamber. A drain is in fluid communication with the drain subchamber. During cleaning, the drain is opened and the screen is rotated against the brush for liberating the particulate contaminants and a limited amount of fuel oil into the two dislodge subchambers. The particulate contaminants and the limited amount of fuel oil then pass through the apertures at a high velocity and into the drain subchamber which exits through the drain.

Abstract: The present invention provides a filter apparatus for use in removing impurities contained in a fluid that includes a housing, a full flow filter contained in the housing, the housing and the full flow filter arranged such that the entirety of the fluid to be filtered by the filter apparatus passes through the full flow filter, a bypass filter, and a conduit which contains a pressure reduction section. The full flow filter, bypass filter, and conduit positioned within the housing such that the bypass filter is positioned downstream of the full flow filter and the pressure reduction section is arranged to create a pressure differential across the bypass filter such that a predetermined portion of the fluid to be filtered by the filter apparatus passes through the bypass filter.

Abstract: A filter filters fluid flowing along an axial flow direction and includes a plurality of concentric cylindrical pleated filter elements having a common axis. A plurality of annular radial gaps between filter elements provide additional flow axially through the filter, providing equalized flow and reducing restriction. In further embodiments, a central filter element is concentrically surrounded by a cylindrical pleated outer filter element and provides additional flow axially therethrough.

Abstract: A filter element assembly includes two cylindrically shaped and concentrically arranged flexible media sleeves (302, 301), wherein the sleeves are respectively supported against radial flow by an inner and outer cage (325, 330). Respective ends of the sleeves are permanently affixed to an inlet plate 303 and a terminal plate 304. The inlet plate includes a closed central area 315 to prevent unfiltered liquid from entering the cylindrical space 306 defined by the inner filter sleeve. The inlet plate also includes openings 316 to allow unfiltered liquid into the annular space 305 between the sleeves. An end cap 340 is permanently affixed to the inlet plate and includes a support on an upper surface thereof for supporting the assembly within a housing.

Abstract: A filtering system for filtering effluent in a septic tank including an outer secondary filter secured within a pipe fitting, wherein the outer secondary filter includes a central opening passing therethrough; an inner primary filter, wherein the inner primary filter is slidingly engaged within the central opening in the outer secondary filter; and a filtering connection element, secured between the outer secondary filter and an inner surface of the pipe fitting, wherein the filtering connection element filters effluent passing upward through the filter pipe fitting and wherein upon removal of the inner primary filter, the outer secondary filter filters the effluent entering the pipe fitting before discharge. Either or both of the outer secondary filter or the inner primary filter may be formed with a biocide to retard the growth of biological material on their surfaces.

Abstract: A reusable filter for mounting on an engine is disclosed herein. The filter includes cylindrical reusable filter mounted in a housing. The reusable filter includes an outer screen, an inner screen, and a ported cylinder between the outer and inner screens. The ported cylinder has a plurality of acutely angled oil-directing openings extending toward the inner screen to cause a swirling fluid motion in a partially filtered compartment around the inner screen to assist in trapping sediment in a contaminant trap located between the inner and outer screens.

Abstract: A filtering apparatus of T-shaped configuration includes a vertically extending filter element receiving tube and a horizontally extending outlet conduit portion. A removable tubular filtering element having a flexible seal surrounding the outer surface of the filter element at a lower end is engagable with an inner surface of the filter element receiving tube. A stationary filter element is disposed at a juncture of the outlet conduit with a central opening in the vertically extending filter element receiving tube wherein the flexible seal of the filter engages with and cleans the particulates from the stationary filter element upon insertion and removal of the tubular filtering element from the filter element receiving portion.

Abstract: The present invention provides a filter apparatus for use in removing impurities contained in a fluid that includes a housing, a full flow filter contained in the housing, the housing and the full flow filter arranged such that the entirety of the fluid to be filtered by the filter apparatus passes through the full flow filter, a bypass filter, and a conduit which contains a pressure reduction section. The full flow filter, bypass filter, and conduit positioned within the housing such that the bypass filter is positioned downstream of the full flow filter and the pressure reduction section is arranged to create a pressure differential across the bypass filter such that a predetermined portion of the fluid to be filtered by the filter apparatus passes through the bypass filter.

Abstract: A submersible fuel filter device (1) of suctional type is connectable to the end of a fuel inlet hose (2) in a fuel tank and comprises a filter (3) consisting of porous plastic with a surrounding outer wall (10) with an upper border (11), a lid (4) provided with an outlet opening (24) that covers the filter (3) and is connected to the outer wall's upper border. The filter is embodied like a cup-shaped body and has a through flow thickness, or material thickness, which is considerably smaller than the other dimensions of the body, and its porosity is less than 10 &mgr;m. The inlet suction hose (2) is connected to said outlet suction opening (24).

Abstract: Two perforated metal sleeves are secured in radially spaced coaxial relation one within the other between a pair of rigid end caps that are releasably secured to opposite ends of a plurality of rods which support the caps removably and sealingly over opposite ends, respectively, of the sleeves. An annular filter cartridge is releasably secured in the radial space between the sleeves with resilient annular end caps on opposite ends of the cartridge disposed in releasable, sealing engagement with the rigid end caps. Fluid that is to be filtered is delivered to the radial space separating two annular filter elements in the filter cartridge. When one or the other of the end caps is removed from the support rods the cartridge can be removed from between the sleeves and replaced without having to destroy the sleeves or the rigid end caps.

Abstract: A filter for removing solids from a liquid comprising a filter housing with an inlet and an outlet, a first filtration element nested within the filter housing and having a first plurality of openings, a second filtration element nested within the first filtration element and having a second plurality of openings for filtering grease and non-particulate substances, where the second filtration element has a shorter height with an upper end thereof being located below at least one opening of the first filtration element thereby allowing bypassing of the second filtration element. Alternatively, the filter may also include a third filtration element nested within the second filtration element and having a third plurality of openings where the second filtration element has a shorter height than the third filtration element, an upper end of the second filtration element being located below at least one opening of the third filtration element thereby allowing bypass of the second filtration element.

Abstract: A filter assembly includes a filter vessel having an inlet, an outlet, and defining a filter chamber therebetween. A basket assembly is removably supported within said filter chamber and has a diameter less than the diameter of the filter chamber so as to define an annular flow path about the basket assembly. The basket assembly includes an outer, permeable member and an inner, permeable member having a diameter which is less than the diameter of the outer, permeable member such that the inner, permeable member is received with in the outer, permeable member so as to define an annular space therebetween and an inner flow path. The basket assembly supports a bag-type filter over both the inner and outer permeable members bounding the annular space therebetween. The bag-type filter includes a first portion having a first, larger diameter and a second portion having a second, reduced diameter. A transition portion is disposed between the first and second portions of the bag-type filter.

Abstract: A filter element assembly has at least two cylindrically shaped and concentrically arranged filter media sleeves each connected at one end thereof to an inlet plate and each connected at the other end to a closed end terminal plate. Openings are provided in the inlet plate to permit entry of liquid to be filtered into the annular space between the filter sleeves. The closed end terminal plate prevents flow of unfiltered liquid from the annular space between the sleeves so as to force the liquid through the porous media of the sleeves to effect filtration.

Abstract: A disposable extended sump line having a pump end and a mouth end for removing water from a barge or other container. The mouth end has a double layered strainer basket covering its entrance. The pump end preferably has a valve which may be opened to introduce water into the sump line from above. The pump end of the line is also configured to connect to a pump, so that suction may be applied. The double layered strainer basket will keep the cargo away from the mouth end of the sump line and prevent clogging. By adding water to the sump line through the valve, the sump line may be primed quickly. Finally, by making the sump line from disposable materials, the problems of damage to the sump line during unloading may be overcome by simply discarding the sump line and replacing it with another before reloading.

Abstract: A filtering system for filtering effluent in a septic tank including an outer secondary filter secured within a pipe fitting, wherein the outer secondary filter includes a central opening passing therethrough; an inner primary filter, wherein the inner primary filter is slidingly engaged within the central opening in the outer secondary filter; and a filtering connection element, secured between the outer secondary filter and an inner surface of the pipe fitting, wherein the filtering connection element filters effluent passing upward through the filter pipe fitting and wherein upon removal of the inner primary filter, the outer secondary filter filters the effluent entering the pipe fitting before discharge. Either or both of the outer secondary filter or the inner primary filter may be formed with a biocide to retard the growth of biological material on their surfaces.

Abstract: The present disclosure relates to a filter assembly including an outer housing, and a removable filter insert that fits within the housing. The filter insert includes a generally cylindrical filter element. An insert body is connected to the filter element. The insert body includes a top end cap in which a top end of the filter element is potted, and a bottom end cap in which a bottom end of the filter element is potted. The insert body also includes a cylindrical liner or wall that surrounds the filter element. The cylindrical liner is spaced-apart from the filter element such that an annular flow passageway is defined between the cylindrical liner and the filter element. The outer wall is configured to prevent contaminants from escaping from the filter insert and contaminating the inside of the housing.

Abstract: A flat or cylindrical screen includes rods and rod-bearing supporting elements. The rods have protrusions in the side walls which are received into inversely shaped recesses in a supporting element. The screen is manufactured by bending the supporting elements open elastically and inserting the rods, whereupon the supporting elements spring back, encircle the rods positively and form a screen mat.

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: A filter element assembly (10) has at least two cylindrically-shaped and concentrically-arranged filter media sleeves (11, 12), each connected at one end thereof to an inlet plate (13) and each connected at the other end to a terminal plate (20). Openings (16) are provided in the inlet plate to permit entry of liquid to be filtered into the annular space between the filter sleeves. The terminal plate is closed to prevent the flow of unfiltered liquid from the annular space between the sleeves and to force the liquid through the porous media of the sleeves to effect filtration. The ends of the filter sleeves are ultrasonically welded to flanges extending from the plates.

Abstract: A filter assembly includes a replaceable filter element disposed within a filter housing. The housing includes a removable cover, and a fitting including an internal central conduit extending along the central axis of the housing. The central conduit is bisected along its length and has a pair of flow channels connected to a pair of ports in the fitting. Another port is provided in the fitting and a still further port is provided in the housing. The filter element includes a first circular imperforate end cap, and a second annular imperforate end cap dimensioned to receive the central conduit. First and second filter media loops are supported between the first and second end caps. An imperforate cylindrical wall is radially disposed between the first and second filter media loops. Annular seals are provided around the opening in the second end cap, at the inner end of the first filter media loop, and at the inner end of the cylindrical wall.

Abstract: The filter element assembly includes a three-way valve member internal to the assembly. The filter element comprises a primary filter construction defining an open internal volume, a first end cover, a second end cover, and a valve construction. The valve construction is positioned within the primary filter construction open internal volume and includes a valve member movable between first, second, and third valve positions. The first valve position blocks fluid flow through a bypass, such that fluid only flows through the primary filter construction. The second valve position permits fluid flow through a secondary filter construction. The third valve position permits fluid to bypass both the primary and secondary filter constructions, and proceed directly to the open internal volume and into an outlet. Methods for filtering are provided.

Abstract: In a water purification system in which a first filter (20) is placed in a flow of raw water for filtering the raw water to produce filtered water, a second filter (27) is placed downstream of the first filter for filtering the filtered water. The first filter is conductive and has a plurality of water passages through which the raw water flows. Each of the water passages of the first filter has a first diameter. At intervals, an electric voltage is applied to the first filter to destroy bacteria which is captured by the first filter. The second filter has a plurality of water passages through which the filtered water flows. Each of the water passages of the second filter has a second diameter smaller than the first diameter.

Abstract: A filtering system for filtering effluent in a septic tank including an outer secondary filter secured within a pipe fitting, wherein the outer secondary filter includes a central opening passing therethrough; an inner primary filter, wherein the inner primary filter is slidingly engaged within the central opening in the outer secondary filter; and a filtering connection element, secured between the outer secondary filter and an inner surface of the pipe fitting, wherein the filtering connection element filters effluent passing upward through the filter pipe fitting and wherein upon removal of the inner primary filter, the outer secondary filter filters the effluent entering the pipe fitting before discharge. Either or both of the outer secondary filter or the inner primary filter may be formed with a biocide to retard the growth of biological material on their surfaces.

Abstract: A fuel filter comprises a head (96) having an inlet (100) and an outlet (102). The head is connected to an element (266) by a nipple portion (186) which has a valve element (196) therein. An actuating projection (222, 272) is engageable with said valve element to open flow through said nipple portion when the correct element is attached hereto. The actuating projection is further supported on a central portion (220, 276) which prevents connection to a nipple portion that extends too far into the element. According to a further embodiment, the filter includes a housing (412) with a removable element (424) mounted therein. The housing has an inlet port (414) in direct fluid communication with a chamber (418). The outlet port (416) is in direct fluid communication with a central standpipe (422). The standpipe has a flow element (442) movable therein for controlling the condition of flow openings (436) in the standpipe.

Abstract: A filter assembly includes a housing having a cylindrical side wall and a first and second end walls at either end of the cylindrical side wall. The first end wall has a fluid inlet port for receiving fluid to be filtered and at least one fluid outlet port for discharging the filtered fluid. The second end wall is easily removable from the housing, and includes a pressure-activated sensing device preferably extending centrally within filter media to an outlet. The filter media can comprise either a single filter element or a pair of nested filter elements, and is supported between the upper and lower end walls. The pressure-activated sensing device includes a piston assembly which is responsive to a pressure drop across the filter media. A first flow path is provided to the upstream side of the piston assembly from the inlet to the filter assembly, while a second flow path is provided to the downstream side of the piston assembly from the downstream side of the filter media.

Abstract: A filter element assembly has at least two cylindrically shaped and concentrically arranged flexible filter media sleeves each connected at one end thereof to an inlet plate and each connected at the other end to a closed end plate. Openings are provided in the inlet plate to permit entry of liquid to be filtered into the annular space between the filter sleeves. The closed end plate prevents flow of unfiltered liquid from the annular space between the sleeves so as to force the liquid through the porous media of the sleeves to effect filtration. Each of the filter sleeves is supported by a rigid, cylindrically shaped mesh screen of an annularly shaped basket.

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: A filter assembly for a flexible, portable bottle having a sealing cap including a filter attached to the interior of the cap to filter out substantially all INORGANICS, ORGANICS, RADIOLOGICAL CHEMICALS AND MICROBIOLIGY. The filter assembly also may include a second filter or Iodinator sealed in the flexible bottle to further remove micro-organisms from water passing therethrough. The filter assembly is designed so that the flexible bottle must be pressurized, as by being hand pressed, after it is filled with water to force flow of water through the either or both of the filters. The filter in the cap includes a check valve to allow the bottle to be repressurized after water has been dispensed from the bottle.

Abstract: Proposed herein is a superfine oil cleaning filter, comprising a casing joined together with a cover, an antidrain valve, a filter element, a relief valve with a coarse-cleaning filter element, and a spring, the coarse-cleaning filter element being positioned upstream of the filter element and the relief valve in the space confined within the internal surface of the casing and the external surface of the filter element and of the filter cover. Depending on operating conditions the coarse-cleaning filter element either may be provided with a safety valve or be made up of two components one of which is positioned upstream of the filter element, and the other is located upstream of the relief valve.

Abstract: A housing system for a removable filter cartridge in an automotive lubrication system. The housing is formed of a thin-walled sheet metal drawn cylinder, with end removed, to form an elongated cylinder with both ends open. A base end has a formed metallic base secured therein by a rolled flange in the sheet metal housing. A closure end has a formed threaded ring secured to the end thereof by another rolled and swaged connection between the sheet metal and formed ring. In the preferred embodiment, the base carries permanent center tubes, and the filter cartridge is of unsupported construction, containing no metallic supports, and adapted to be disposed of in an environmentally acceptable manner.

Abstract: A panel filter for filtering waste media comprises at least two stacked filtering medium sheets. Each sheet is shaped to have two substantially identically-shaped portions integrally interconnected along an intermediate portion thereof. The stack of filtering medium sheets is folded over upon itself along the intermediate portions of the filtering medium sheets to create an inner central cavity of said stack and mating marginal edges that are secured and sealed together to form an outlet opening at a point along the marginal edges. A filtration conduit is received in the outlet opening of the panel filter and communicates with the inner central cavity of the panel filter.

Abstract: A filter system using a filter cartridge adapted for disposal in an environmentally acceptable manner. The filter cartridge has no metal parts, and thus avoids the use of a metal center tube, or a center tube of any configuration. The housing itself carries a permanent center tube. A sealing arrangement formed between the filter cartridge and the housing provides a radial seal isolating the outer periphery of the filter cartridge from the remainder thereof. Filter and caps are in the lower pressure downstream zone, and thus any axial forces imposed on the filter place the filter media in tension to avoid the imposition of crushing loads on the unsupported filter.

Abstract: An on-site automated closed loop petroleum based hydrocarbon fluid filtration and recycling system that continuously recycles a spent petroleum based hydrocarbon fluid and simultaneously continuously dispenses the recycled petroleum based hydrocarbon fluid.

Abstract: A sludge dehydrating press device includes an outer screen case in which sludge to be treated is filled, the outer screen case having a screen surface in at least a part thereof, a press for pressing sludge filled in the outer screen case, one or more inner screen cases disposed slidably in the outer screen case including a screen surface extending in a direction crossing the direction of pressing by the press and having continuous slits and the inner screen cases having also a space into which water extracted from the sludge flows, and a positioning device for positioning the inner screen cases to a predetermined position after completion of pressing by the press. The screen surface of the outer screen case preferably is made of a wedge wire screen having a flat inside surface. The press device may further include an extracted water removing screen tube coaxially with the outer screen case.

Abstract: An interior wedge wire drum screen is mounted wholly within an exterior drum screen of narrower wedge wire spacing, and both are mounted to a frame and caused to rotate about a common central axis. One end of the outer drum is open and the other is closed by a disc-shaped drum head. The inner drum has an open end which is spaced inward of the open end of the outer drum. The waste water is presented to the surface of the inner drum screen by a waste water infeed which employs a vertical column. The column extends upwardly of an inlet and has a gradually increasing cross-section for reducing the flow of velocity of the waste water. A horizontal trough extends along the axis defined by the drums and communicates between the top of the column and a tray. The edges of the tray terminate in weirs which are parallel to the sides of the inner drum. Water flows in a smooth sheet over a weir to impact the sides of the inner screen with low velocity.

Abstract: A filter is provided for use with an in-tank fuel pump for an internal combustion engine. The filter is disposed within a fuel tank and includes a main filtration chamber connected to an inlet of the fuel pump and a return fuel chamber connected to the engine for introducing thereto return fuel from the engine. The main filtration chamber has an upper side peripheral wall formed from a meshed filter medium. The return fuel chamber is connected to the main filtration chamber in such a manner that the upper side peripheral wall of the main filtration chamber serves as a partition wall between the main filtration chamber and the return fuel chamber. In one embodiment, the return fuel chamber has a peripheral wall formed from sheet or plate impermeable to fluid.