Abstract: An apparatus and method for filtering a fluid containing contaminants is provided whereby the apparatus includes an inlet for drawing fluid from a fluid source, a housing having attached thereto the inlet, a contaminant outlet, a clean outlet, a filtering assembly and a mechanism for agitating the filtering assembly. The filtering assembly has an upper or upstream end connected to the inlet and a lower or downstream end connected to the contaminant outlet. The filtering assembly is disposed within the housing and is connected to the contaminant outlet whereby fluid is introduced to the filter assembly at an upper end of the filtering assembly by the fluid inlet and whereby fluid is passed through the filtering assembly to provide clean, filtered fluid which is discharged via the clean outlet, and debris and other contaminants contained in the fluid are separated from the fluid and retained by the filtering assembly.

Abstract: The present invention relates to a filter unit, and a filtering system using the filter unit, comprising a housing having a longitudinal axis and an inlet and outlet for fluid containing solid contaminants and a back-flush inlet and back-flush outlet for cleansing fluid. This housing contains a substantially cylindrical filter element which has a longitudinal axis coincident with the longitudinal axis of the housing. The filter element has disposed within it a conduit, adapted to be opened to atmospheric discharge, having a longitudinal axis coincident with the longitudinal axis of the filter element. The conduit also has disposed along its surface cleansing members, which extend from the conduit to the filter element and have apertures to allow the cleansing fluid to flow through the members and into the conduit.

Abstract: A liquid recycling and filtering system is well suited for use in continuous flow recycling surface cleaning devices. The system employs a canister containing a liquid cleaning solution, and a cylindrical filter submerged in the liquid and defining a chamber containing a portion of the liquid. A liquid supply conduit withdraws liquid from the chamber and supplies the liquid to a cleaning tool head, where the liquid is sprayed upon a floor or other surface being cleaned. A counterflow conduit is coupled to the liquid supply conduit and to the chamber, for transporting liquid under pressure to a spraying assembly within the chamber. The spraying assembly includes a rotatable manifold and nozzles at opposite ends of the manifold. The nozzles spray the liquid in planar, fan-shaped patterns that impinge upon the filter over limited surface areas.

Abstract: A filter operable in either a filtering mode or in a flushing mode, includes a cylindrical filter body, and a plurality of partitions defining a plurality of axially-extending, circumferentially-spaced filter compartments each communicating with an axial section of the filter body. All the filter compartments communicate with the fluid inlet except for at least one filter compartment which is blocked. A flushing pathway is provided between each blocked compartment and the flushing outlet. A valve in the flushing pathway is movable either to (a) a closed position during the normal filtering mode, or (b) an open position during the flushing mode.

Abstract: An apparatus is disclosed for filtering slurries of minerals or other fine particles. The apparatus includes a filter plate having an interior porous support layer and a microporous metal filtration layer overlying the support layer, the pore sizes in the filtration layer preferably being in the range of from about 0.2 to 3 microns. The side of the filtration layer non-adjacent the support layer constitutes a filter surface for the mineral.

Abstract: A floating media biofilter is provided, comprising a tank having a bottom and a sidewall, the sidewall having a lower portion inwardly sloping toward the bottom. Floating media are present in the tank for forming a media pack when the tank is filled with liquid, and the media are retained by an upper screen positioned in the upper portion of the tank. An inlet line provides nonfiltered liquid to the tank from an aquaculture environment, while an outlet line above the upper screen delivers filtered liquid back to the aquaculture environment. A weir is employed between the upper screen and the outlet line to collect filtered liquid from the media pack. Backwashing is accomplished by a motorized blade system which causes the media to circulate within the tank with substantially no expansion of the media pack. The circulating media loosens filtered matter and sludge entrained therein so that the waste solids can be removed by a sludge line connected to the bottom of the tank.

Abstract: A continuous filtration device comprising a cylindrical filter rotationally driven around the axis thereof, a filtration tank in which an outer chamber having an inlet for a liquid to be cleaned and an inner chamber having an exit for a liquid filtrate are separated by the filter, a cleaning means disposed in the outer chamber for spraying a cleaning liquid at high pressure at an acute angle to a surface of a filter to be cleaned, and a guide plate disposed at a position on the side opposite to the cleaning means with respect to the surface to be cleaned for guiding obstacles removed by cleaning and detaching them from the filter. The filter can be automatically cleaned by spraying a liquid to be filtered, liquid filtrate or similar other liquid to the surface of the contaminated filter. The device is useful, for example, for filtration of marine fuel oils or lubricants.

Abstract: A method and apparatus for cleaning a filter apparatus of the type having an atmospherically vented tank, a rotatable filter frame in the tank having filter material thereon providing one or more filter effluent compartments on the filter frame. An influent line supplies liquid containing suspended solids to the tank and a filtered effluent outlet communicates with the filter effluent compartment, and a spray wash device including spray nozzles is operable during a wash cycle to direct high pressure liquid spray at a side of the filter material on the filter frame in a spray zone. An air tight hood is mounted inside the tank and extends above the upper periphery of the filter frame to an open lower end below the spray zone.

Abstract: A backwashable self-cleaning strainer has a vertical housing containing a rotatable strainer basket. The housing has an inlet adjacent the top thereof and an outlet adjacent the bottom wall, with a flush discharge opening in the bottom wall. Components for rotating the strainer basket are located outside the flow of water containing particulates that enters the housing. A hollow backwash conduit with a passage through the sidewall is positioned adjacent the inner surface of the strainer basket and communicates with a sealable aperture in the wall of the housing. Upon opening of the aperture, cleaned water flows through the side wall of the strainer basket, removing particulates therefrom, and out the hollow backwash conduit. An intermittently rotatable brush is also provided to brush the inner surface of the strainer basket.

Abstract: A method and apparatus for cleaning a filter apparatus in which liquid influent is passed through web filter material on a rotatable filter frame into a filter effluent compartment and wherein the filter material is intermittently backwashed during a filter time by a suction device at an outer side of the filter material which draws filtered liquid from filtered effluent compartment in a backwash direction through the filter material, and wherein the filter material on the filter frame is subjected to a wash operation during a wash time by directing a high pressure liquid spray at one side of the filter material. The pressure in the suction device during backwashing is monitored, and the wash operation is initiated after the pressure in the suction device reaches a preselected sub-atmospheric pressure.

Abstract: A cylindrical plastic pipe is used as the sidewall of the rotary portion of the strainer. Apertures are drilled radially through the pipe, and one or more screen assemblies are circumferentially wrapped around the outside of and removably fastened to the pipe to cover the apertures. The central core of the strainer contains both supply and suction pipes. The supply pipe feeds cleaning and drive nozzles that are aimed at the pipe apertures. The cleaning nozzles are aimed radially for cleaning certain apertures. The drive nozzles are aimed tangentially toward a circumferential succession of other apertures near the bottom of the pipe to drive the rotary portion. In one embodiment the drive nozzles can rotate the rotary portion in either direction.

Abstract: A continuous, self-cleaning strainer and method of straining comprising a housing, a rotatably driven shaft mounted on the housing, a primary and a secondary drum concentrically mounted on the shaft and rotatable therewith, the drums having a number of perforations and strainer inserts mounted in each of the perforations, each drum being provided with a reduced pressure backwash zone outside the drum and connected to backwash outlet connected to atmospheric pressure whereby, when a strainer insert passes the reduced pressure zone, pressurized liquid inside the drum forces liquid backwardly through the insert to flush accumulated solids therefrom. Backwashing operation can be commenced by means of a valve disposed in the backwash outlet lines and actuated by a timer or by a pressure differential switch, or both.

Abstract: Apparatus for filtering liquid effluent comprises, in sequence, inlet means, filtration means, and outlet means. Each filtration means comprises at least one disposable sack filter (2, 3, 4, 31) of defined porosity. The open end of each sack filter is attached to an outlet conduit in communication with the inlet means. The opposing closed ends of the sack filters are attached to movable supports to cause agitation of the sack filters.

Abstract: The invention relates to a process and a centrifuge for removing solids located on a cylindrical casing wall (3) of a rotating centrifuge, in particular solids precipitated in the centrifuge from a liquid-solid mixture, to a solids exit opening (6) by sweeping the entire casing inner wall (9) in the direction of the solids exit opening (6). In order to reduce clogging, it is proposed according to the invention that in each case the casing inner wall (9) is swept in strips up to the solids exit opening (6), during one sweep up to the solids exit opening (6) only a part of the casing inner wall (9) is swept, and after a certain time the entire casing inner wall (9) is swept by strips (11) swept sequentially in time.

Abstract: A cleanable filter system including a housing defining an inlet for fluid to be filtered and an outlet for filtered fluid, a stack of filter disks disposed within the housing and defining an upstream surface communicating with the inlet and a downstream surface communicating with the outlet and filter disk cleaning apparatus including a plurality of nozzles coupled to a source of backflushing fluid and providing a high pressure stream of fluid impinging on the downstream surface, and apparatus for providing both linear and rotational motion of the plurality of nozzles relative to the downstream surface thereby to result in systematic scanning of generally all of the filter disks.

Abstract: The invention concerns a backwashable filter device, specially for domestic water conduits that includes an inlet for raw water, a raw water chamber connected to the inlet, an outlet for clean water, a clean water chamber connected to the outlet, a filter element and an outlet for backwash water. The filter element is arranged between the raw water chamber and the clean water chamber and features a partial area (B) that accommodates water flow only in backwash but not normal operation. A conduit channel connects the outlet for backwash water with the partial area (B). At least one separate conduit connection is provided from the clean water chamber to the partial area (B). A conduit area is present in the conduit connection and designed in a nozzle-like shape so that clean water can be conducted from the clean water chamber at increased velocity against the partial area (B).

Abstract: An apparatus for filtering slurries of minerals or other fine particles is disclosed. The apparatus includes a ceramic filter plate and a fluid flow device for drawing a partial vacuum across said filter plate and to supply a pulsed liquid to the filtrate side of said filter plate. The apparatus also includes an oscillating device that facilitates removal of cake which accumulates on the filter plate when sued simultaneously with or successively with said pulsed liquid.

Abstract: A liquid filter and method is disclosed comprised of a housing defining a filter chamber, with a filter belt advanced into the filter chamber and receiving liquid flow to filter the liquid. Different sections of the filter belt are alternately positioned in the filter chamber by a pair of drive-take up rollers each positioned on one side of an entrance opening to the filter chamber, which are driven in opposite directions after alternate cycles. Each section of the filter belt is scraped when exiting and subsequently cleaned with washing sprays as the particular section is advanced back into the filter chamber. The filter belt is detachably attached at either end to a respective roller by a sewn in flexible element received an undercut groove in the roller surface.

Abstract: The device is the dual functional filter of the slurry, scraping of the filtered cake, compression the scraped cake and discharging the compressed cake, continuously. The device is composed of both the filter part and the cake compression part. While the filter part is positioned upward holding the filtrate room, the slurry chamber and the filter medium in between, the lower cake compression part contains the screw blade attached to the shaft stationed from the top of the filter part to the end of the cake compression part. The filter cake piled on the filter medium during the filtration of the slurry fed under pressure, is scraped by the scraping blades attached to the shaft or, if necessary, peeled off by the pressure flashings of the back wash liquid through the cake on the filter medium. Precipitated cakes from the above is compressed in the compression part by the screw.

Abstract: A filter for flowing polymer having a filter element progressively advanced between an on-stream position communicating between the upstream and downstream passages and a backflush position. In the latter position, filtered polymer is forced through a segment of the element in the direction opposite to on-stream flow. The filter is advanced in steps alternately with the energization of a pump for creating the backflush pressure. The steps are determined to cause each filter portion to remain in the backflush position for at least two consecutive steps.

Abstract: Filter apparatus for continuously filtering fluids containing large amounts of particles, including large amounts of ultrafine particles. The filter apparatus includes filter media and a backwash system which continuously removes deposited filtrate from an inlet side of the filter media. The filter apparatus also includes means for at least temporarily retaining filtered fluid in an outlet chamber of the apparatus at a location immediately proximate an outlet side of the filter media, such that backwashing of the filter means occurs continuously and instantaneously as filtered fluid passes through the filter means.

Abstract: A rotary self-cleaning strainer comprises a circular cylindrical walled pipe on which a circular cylindrical filter screen assembly is journaled for rotation. The pipe has an intake that is surrounded by the filter screen assembly and a discharge that is connected to a pump. When the strainer is placed in a body of water that is to be pumped, water is drawn through the screen that forms the sidewall of the filter screen assembly and enters the intake of the pipe. The filtered water is conducted through the PVC pipe and to the pump. Two sets of nozzles disposed within the filter screen assembly are supplied with return water through a supply line tapped into the pump outlet. The water is forcefully emitted against the screen to both rotate the screen assembly and dislodge adhering debris from the exterior of the screen. Each set of nozzles is 180 degrees from the other so that each acts upon a limited zone of the screen.

Abstract: Method and equipment for filtration of a suspension so that the suspension to be filtered is fed from a feed part (4) onto the filter face of a filter member (5), which moves relative the feed part. The pulp layer is formed on the outer face of the filter member and the filtrate flows into the interior of the filter member, and the pulp layer is removed from the filter member at the removing point. After the pulp removing point (17), before the feed point (4), one or several cleaning points (12) are provided wherein liquid is made to flow through the filter member (5) from the inner face of the filter member to the outer face. The flow rate of the liquid that flows through the cleaning point or points is adjusted higher than the rate of any liquid flow that may flow through the rest of the filter member from the inside-face side to the outside-face side.

Abstract: In a filter centrifuge with a filter medium, a filter cake is formed following the introduction of a suspension. In a first filtration phase the suspension is exposed to centrifugal filtration a first filtration which dewaters by the inertia forces. In a second filtration phase, the cake is subjected to compressed gas filtration using frictional forces generated by a gas flow. In the second filtration phase, gas at atmospheric pressure flows through the filter cake and filter medium and is exhausted from a filtrate collector space. This space is composed of a gas space and a filtrate liquid space. To obtain flow through the solid cake at an increased pressure difference, it is proposed to provide the filter centrifuge in a pressure housing with a superatmospheric pressure controlled by a difference in filtrate liquid levels in the filtrate liquid space and the annular space following the filter. This liquid control prevents the penetration of filtrate liquid into the gas exhaust line.

Abstract: An improved control valve for use in a filtration apparatus for treating waste product which comprises a tapered rotary cylinder, a rotary filtration cylinder disposed around the tapered rotary cylinder, a fixed steam injection pipe disposed above the rotary filtration cylinder, and a plurality of control valve members whereby the waste product which is conveyed inside the rotary filtration cylinder and is heated, and which collects in the holes of the rotary filtration cylinder is cleaned away by the spraying of the surface of the rotary filtration cylinder with hot steam through nozzles of a fixed injection pipe under the control of the pressure in a treatment zone between the tapered rotary cylinder and the rotary filtration cylinder.

Abstract: A filter used for separating solids from liquids, the filter having a surface on which a filter cake is formed with the solids and being adapted to treat said cake. The filter utilizes a housing; a stirring apparatus disposed within the housing, said apparatus including stirring arms and a first motor for rotating the arms; and at least one second motor for raising and lower the apparatus. The second motor includes a hydraulic cylinder having a piston which is raised and lowered by hydraulic pressure. The piston is connected to the apparatus to raise and lower the apparatus in accordance with the movement of the piston. The cylinder has a first port above the piston and a second port below the piston. The piston is raised when the pressure applied at the second port is higher than that applied at the first port, and is lowered to lower the apparatus when the pressure applied at the first port is higher than that applied at the second port.

Abstract: A horizontally mounted cylindrical container is adapted to mount through demountable end plates a cartridge filter in the container through demountable end plates for rotation around a lower axis than the center axis of the container. The combination of container and filter is connected in an aqueous system through a top inlet pipe and hand controlled valve and a lower front end plate outlet, and to a source of pressure cleaning media through an upper quadrant valve controlled turnable tube slidably mounted through a rear plate inlet and supported in the container by a combination track and baffle member fixed to the container top. A nozzle fixed to the free end of the pressure media tube jets cleaning media against the filter to rotate it alternately in both directions of rotation and for its full length. A second inlet pipe and valve is fixed to the top inlet pipe a chemical cleaning soak in baffled minimum amounts because of the baffling and filter mounting below the center of the container.

Abstract: A fluid filter comprising a housing defining a fluid inlet and a fluid outlet, a filter element defining an upstream surface communicating with the fluid inlet and a downstream cylindrical surface communicating with the fluid outlet, the filter element comprising a stack of filter disks defining a hollow volume interiorly thereof and a longitudinal axis, and backflushing means for removing filtered out sediment from the filter element comprising an axially displaceable backflushing nozzle assembly disposed within the hollow volume comprising a rotating head coupled to the fluid inlet and having fluid outlet means, arranged to provide a generally radially directed pressurized jet and rotational motion of the rotating head.

Abstract: A fluid filter comprising a housing having a central aperture formed in the bottom thereof, a filter element disposed in the housing and arranged to receive a flow of fluid to be filtered from an upstream side of the element to a downstream side thereof, and a fluid inlet and outlet manifold disposed at the bottom of the housing in communication with the central aperture for providing fluid inlet and outlet communication through said aperture with a fluid inlet and a fluid outlet.

Abstract: Apparatus adapted for use in a water clarification system which removes particles of greater than a predetermined size from the clarified water includes a screen or a pair of concentric screens positioned in a clarified water storage area between an inlet and a clarified water outlet. One or more spray heads for direct a shower of high pressure filtered clarified water at the outlet side of the screen or screens to loosen or remove particles therefrom. In addition, a rotating brush can act on the inlet side of the screen. Particles removed by the cleaning elements are recirculated through the system. Water levels are maintained by overflow control or by monitoring the water level and utilizing the output from the monitor or monitors to selectively control valves in the inlet or outlets from the system.

Abstract: Separation of vaporizing oil and smoke to clean polluted air. That is, by inducing the particles to directly impact the revolving filter drum, and some small particles to be intercepted in the meshes and some large particles to collect in the groove means, due to the rotation of blower blades. Clean air will go upwards through the revolving filter drum through a pressure effect. Automatic cleaning of the polluted revolving filter drum and groove means is achieved by rotation of an axial fan causing a centrifugal effect.

Abstract: A plate-type filter that is provided with a sealing element that is disposed in the flow path of liquid that is to be filtered and seals off the in-flow region relative to the filling space of the filter housing. The sealing element is movable into its sealing position under the pressure of in-flowing liquid. The sealing element is therefore in the sealing position only when liquid is flowing in. When the filter elements are rotated for centrifuging off the filter cake, the sealing element is no longer in its sealing position due to the absence of liquid pressure, so that the sealing element is not stressed during the centrifuging process.

Abstract: The invention relates to an apparatus for cleaning viscous materials, more particularly melted down scrap synthetic materials in a recycling process. The apparatus of the invention comprises a cleaning screen in the form of a strip which can be moved at right angles to the direction of flow of the material to be cleaned, so that the soiled area of the screen may be replaced by a clean area. In order to prevent the synthetic material from escaping when the cleaning screen is advanced, the volume before the screen is enlarged. This reduces or eliminates the pressure upon the screen so that the strip can easily be displaced, with no escape of the viscous material from the gaps in which the cleaning screen is located.

Abstract: A filter comprising a housing having a plurality of filter tubes suspended from a partition which divides the housing into an upper and lower chamber and a backwash selector which is rotated by backwash fluid so that during the backwash mode filter tubes are sequentially exposed to the full force of the backwash fluid so that an improvement in backwashing is obtained. The use of the filter is also disclosed.

Abstract: An arrangement for scraping the filtered solids build-up from the surface of a drum filter is disclosed, in which a scraper is mounted with an edge against the surface so that rotation of the drum will accomplish scraping of the surface. Clutching engagement with a rotary drive member is produced by a predetermined extent of axial shifting of the drum against the resistance of a spring bias force. The drum is also arranged to be subjected to an axial pressure force developed by flow through the filter so that clutching engagement is automatically produced upon build-up of solids to a predetermined extent to cause a level of pressure force to be developed to produce a consequent axial shifting sufficient to produce clutching engagement and rotation of the drum. A drag out conveyor moving through the tank engages a rotary sprocket which comprises the rotary drive member, and the scraper edge and drum are positioned to directly deposit the scraped solids on the conveyer to be removed from the tank.

Abstract: A filter for hot melt adhesive is carried within a passageway in a manifold and is rotatable therein between a filtering position in which hot melt adhesive is directed to the inner core of the filter at one end thereof, and a backflushing position in which hot melt adhesive is directed onto the outside surface of the filter at the opposite end thereof. In the filtering position, the hot melt adhesive flows from the inner core outwardly through a filter screen into the main passageway for collection and discharge from one end of the manifold. In the backflushing position the adhesive flow is directed from the outside surface of the filter in the reverse direction through the filter screen to dislodge filtered impurities therefrom, and then the impurities are carried out a drain at the opposite end of the manifold.

Abstract: A self-cleaning filter apparatus including a first filter unit and a second filter unit. Each filter unit includes a housing forming an internal cavity, a liquid agitator means rotatably mounted within the cavity and adapted to be rotated by a rotating means external of the housing. A flat filter element is mounted in supported relation between the housing and a connected housing cap with a filter face openly exposed to said cavity. The housing forms inlet and outlet liquid flow passages for circulating a liquid sample through the cavity around the agitator and into filterable contact with the filter face. The agitator means agitates the liquid sample within the cavity and forces a portion of the liquid sample in a washing action across the filter face. The housing cap forms a liquid filtrate passageway for withdrawing a filtered sample of the liquid sample through filter element. A drive is connected to concurrently drive the agitators of both first filter units.

Abstract: A filtering device has a one-way filter belt guided by an endless screen support belt in the filtration area through at least 120 degrees on an arcuate path for the formation of a deep liquid inlet area. The supply of liquid occurs in the central portion of this arcuate path. Sludge bars coming to rest on the filter belt prevent sludge accumulations in the liquid inlet area.

Abstract: In a self-cleaning filter of known type comprising a cylindrical body, a removable cover, a plate provided with holes and defining an inlet and outlet chamber inside said body, filtering tube-shaped elements engaged at their open ends with the central plate and at their closed ends with a support plate rigidly connected to the central plate, cleaning tubes automatically sucking the stored material from said filtering elements and leading off to a reception tube rotated by external power means, the improvement consisting in that the support plate is engaged between the cover and the free end of the cylindrical body and is provided with additional holes in coaxial relation with the through holes of the central plate and engaging said filtering elements in the region of their respective closed ends, each of them being substantially composed of a closing wall disposed at a predetermined distance from the edge of the filtering element facing said cover and being furthermore provided with an annular shoulder abutti

Abstract: Liquid filter devices, particularly for irrigation systems are known to comprise automatic, periodic reverse-flow rinsing arrangements, whereby water is flushed in the opposite direction to release clogged particles from the filter member. The disclosed devices utilize the reverse, flushing water flow to release the filter member of the device from its normal, stationary position, and rinse it by jets. The jets are also useful to impart a rotatable movement to the filter member. In the case of disc filters, the discs become released and spaced from each other, and individually spin during the rinsing thereof.

Abstract: A filter device is disclosed in which the filter element is made to spin about itself during reverse-flow, flushing operational stage thereof. The device comprises a sprinkle member rotatably supported inside the filter element. Reaction forces generated by water jets forced through the sprinkle member cause its rotation, and the filter element is then caused to rotate by the jets sprayed against its inner surface. In a preferred embodiment disclosed, the filter is of the disc-type, provided with a hydraulic cylinder adapted to release the compact engagement of the disc. The discs become separated from each other, each disc being imparted the rotational movement of the rotating jets.

Abstract: An improved desludging device for basket centrifuges facilitates the automatic withdrawal of hard sludge from the centrifuge. The device includes a sludge discharge tube and a sludge re-slurrying tube, the tubes being connected in a loop, so that fluid exiting the centrifuge through the discharge tube reenters the centrifuge through the re-slurrying tube. The re-slurrying tube terminates in one or more nozzles or slots, pointed in the general direction of the discharge tube. This continual recirculation of fluid causes the hard sludge in the centrifuge to return to the form of a slurry, and the slurry is periodically withdrawn from the centrifuge. The re-slurrying effect may be enhanced by the occasional introduction of some process liquid, or other liquid, into the centrifuge. The sludge discharge tube and re-slurrying tube are mechanically linked, and are programmed to move towards the rim of the centrifuge until substantially all the sludge is removed.

Abstract: There is disclosed a nutsch filter having blades fitted to a central, vertically positioned hollow shaft by a hollow arm, the blades having a plough-like cutting edge and a spatula-like bottom surface acting in the opposite movement direction. A discharge pipe, arranged concentrically to the hollow shaft, is axially displaceable. The discharge pipe is moved upwards against a cover for sealing the filter casing. The filtration or resuspension or drying of the filter cake takes place in this position. In order to discharge the compressed filter cake, the upper edge of the discharge pipe is set by the blades to the level of the paring or skimming process. Paring of the filter cake and conveying of the pared mass into the central discharge pipe opening takes place in a single operation by means of the blades. On drying, hot air or a hot fluid is passed through the cavities of the arm as well as the parts connected thereto.

Abstract: Apparatus particularly useful for the removal of iron particles and other magnetic solids from printing ink. Included is a casing (22) through which flows a liquid to be clarified. A plurality of straight bar magnets (M), mounted to the inside surface of a tubular sheath (50), are magnetically attached to the outer surface of the casing for creating magnetic fields within the casing. The magnetic solids contained in the liquid are magnetically attracted to the inside surface of the casing and so are separated from the liquid. The detachment of the magnets from the casing causes the separated solids to settle to the bottom of the casing for easy discharge through a drain port (38) formed therein. A cartridge filter (28) is provided centrally within the casing for the separation of nonmagnetic solids from the liquid.

Abstract: Apparatus is disclosed for continuously filtering a flow of melted plastic which includes a mechanism for purging the filter without interrupting continuous operation. A filter screen is disposed in a circular chamber within the filter housing. A collector plate including a plurality of radially oriented, triangularly shaped passages is disposed on the upstream side of the filter screen, defining triangular pockets for collecting contaminants that cannot pass through the filter screen. A collector head is rotatably disposed for selective registration with the collector pockets, and an indexing mechanism is included for sequentially stepping the collector head around the collector plate for momentary registration with each collector pocket. The collector head communicates with a contaminant discharge passage that is opened and closed in timed sequence with movement of the collector head.

Abstract: The invention relates to means for filtering a liquid containing impurities. Said means comprise a filtering drum (9) rotating within a housing (1) and having around it an annular chamber (13) into which opens a conduit (6) for supplying the liquid to be filtered and a conduit (7) for evacuating the liquid leaving the drum and for cleaning the corresponding section. The lateral wall of the drum (9) is equipped with sliding blades (11) which prevent any and all communication between the two conduits (6) and (7). The filtered liquid is evacuated through the lower wall (9d) of the drum (9) through the lower wall (9d) of the drum (9) through an axial opening. The invention applies in particular to the filtration of fuel for aircraft engines.

Abstract: A clarifier allowing increased fluid pressure differentials across the filter septum is arranged with one face of the septum exposed to the contaminated liquid and the opposite face exposed to the suction pressure of a pump with the discharge of the pump capable of being redirected to backflush through the filter septum, such backflushing being carried out sequentially through small area segments of the septum. The return of a flight conveyor may be moved selectively into and out of scraping or wiping relation with the filter and filter wiping and backflushing may be automatically controlled.

Abstract: Method and apparatus for clarifying liquids wherein a flight conveyor in the settling tank has a forwarding run for removing sludge from the bottom of the tank and a return run which is selectively moved into and out of wiping cooperation with a filter between the settling tank and a clean-liquid tank, and a filter backwasher in the clean tank is selectively operable to progressively backwash the filter, and both the wiping and backwashing being accomplished in accordance with the clogged condition of the filter.

Abstract: A water intake for example for taking cooling water for industrial installations from a river, a lake or the sea, has a sieve with a filter element and a recovery channel associated with the filter element for collecting and saving elements of the biomass which become stuck to the filter element. Electrodes are associated with the recovery channel 25 and are designed to induce an electrical field, at right angles to the recovery channel in the water to be tapped, so as to compel fish either to swim by themselves in the direction of this recovery channel or to allow themselves to be carried towards the recovery channel by a reverse water current induced at right angles thereto.

Abstract: A self-cleanable filter, comprises: a housing having a fluid inlet, a fluid outlet, and a dirt purging opening; a filter body within the housing and having a surface facing the inlet side of the housing; and a cleaning body within the housing and movable from a home position along the cylindrical surface of the filter body for cleaning same. The cleaning body comprises a first section defining an internal chamber having an inlet opening facing the surface of the filter body to be cleaned and movable along said surface, and a second section closing the dirt purging opening when the cleaning body is in its home position. The second section has an outlet opening communicating with the internal chamber and located within the housing in the home position of the cleaning body but movable through the housing purging opening to a position externally of the housing upon the movement of the cleaning body for cleaning the filter.