Abstract: A filter belt movement control and belt treatment means for a pressure filter apparatus. The movement control includes a marking means in or on the filter belt medium and a sensing means on the filter apparatus. The sensing means detecting the position of the marking means in or on the belt filter medium and adapted to signal a controller for control of the position of the belt filter medium within the apparatus. The treatment means including cleaning, bathing and coating means for treating the belt filter medium and vibratory means for operation with the treating means.

Abstract: A pressure diffuser is constructed so that the compression of pulp that normally occurs during rapid movement of the screen assembly does not significantly degrade the efficiency of the washing (or other treatment liquid) action in the diffuser. This is accomplished by providing at least two headers, including a first vertical header and flow control assembly for one or more sets of horizontal treatment liquid conduits adjacent the pulp inlet to the diffuser, and a second vertical header and flow control assembly for one or more horizontal treatment liquid conduits remote from the pulp inlet. The first and second vertical headers may comprise a common pipe with a flow preventer precluding flow between them, or distinct pipes supplied with treatment liquid by a common pump. The advantageous results are further achieved by providing at least one ring [mounted between the outer screen and the concentric inner support cylinder of the screen assembly] with a plurality of rapid-flow restricting openings.

Abstract: A separation device for suspensions comprises a housing (1), a filter body (3) with a wall of filter material situated in the housing, spray means (14) adapted to spray jets of a suspension to be separated directly onto one side of the wall of filter material, and means (4, 6) for displacing the filter body relative to the spray means. According to the invention the filter body forms a substantially circular cylindrical drum (3) with a vertical center axis, the circumferential wall of the drum comprises said wall of filter material. Further, said displacement means (4, 6) is adapted to turn said cylindrical drum about said vertical center axis during operation.

Abstract: A fluid filter assembly having a body with a chamber for receiving a filter element supported by the body. At least one cleaning device is positioned adjacent the inlet side of the filter element. The cleaning device includes a hollow duct for collecting dislodged particulate matter, an adjustable scraper and a deflector substantially equal in length to the scraper. Nozzles may be provided for directing pressurized cleaning fluid toward the cleaning device.

Abstract: A filter apparatus for thermoplastic synthetic plastics material includes a screen carrier member having at least one screen nest, the screen carrier member being shiftable in a longitudinal direction in a housing. For backwashing the screen nest, the screen nest is in connection with a washing channel in a washing position of the screen carrier member In order to make the washing process quickly, effectively and uniformly over the surface of the screen and in order to avoid an additional loss of the mass in the main flow at the backwashing process, a storage space is provided in the screen carrier member which is filled in normal operation with cleaned melt. A piston in the storage space is shifted for moving the material provided in the storage space in the backwashing direction through the screen nest and into the washing channel.

Abstract: A filter backflushing system including either a pneumatically-driven piston or pneumatic accumulator for propelling a supply of a filtered backflushing fluid, contained in a backflushing fluid chamber, in a reverse direction through a filter element. The filter backflushing system provides a high intensity, substantially instantaneous, constant pressure backflushing flow which effectively removes clogging contaminants from the filter element.

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 filter drum with a tubular filter belt is journaled for rotation on a pipe which serves to supply filtered coolant to spray nozzles located within the drum and operable to backwash the filter belt.

Abstract: A mobile multi reservoir unit aspirates liquid with solids from septic tanks, treats immediately the liquor by a flocculent polymer and dehydrates the product by a low speed vertical centrifugal machine; the liquid is returned to the septic tank and the solid is maintained in a mud stade, easy to rake off by a rotating folding knife, followed by transfer to a storage reservoir; a pump unit enacts the material transfer from and to each reservoir in succession by aspiration and by pressure build up.

Abstract: The filter arrangement is provided with a filter in the form of an endless conveyor which is releasably mounted within a transport chute through which a flow of water can be directed. The filter is formed as a unit to be released from supports at the bottom of the transport chute for ease of cleaning. The filter is further pivotally mounted at the lower end so as to be adjusted angularly relative to the flow of water through the transport chute. Seals are provided between the sides of the filter and the side walls of the transport chute to preclude passage of liquid. A plurality of such filters may be disposed within the transport chute and may be associated with various discharge conveyors for discharging materials which have been filtered out of the flow of liquid.

Abstract: The invention pertains to a device to separate solid materials from a stream of liquid, particularly from cooling water. In the case of the known devices, difficulties occur in cleaning the filter from fibrous contaminants generally or starting with a certain size. The subject device draws off fibrous as well as coarse grained contaminants equally well.A preferably funnel shaped filter 3 with a suction device 4 running at an angle to the surface line 6 of the funnel filter 3 is arranged in a pipe shaped housing. The inclination creates a force component 19 which transports the coarse grained contaminants to the tip of the filter where they are drawn off by the suction opening 8 of the suction rotor 7. The fibrous contaminants are drawn off by the suction device 4.

Abstract: A self-cleaning filter including a filter housing having at least a raw-liquid inlet and a clean-liquid outlet, a filter medium interposed between the raw-liquid inlet and the clean-liquid outlet At least one nozzle is located in proximity to the filter medium and is connectable to at least two different sources of pressure, one of which pressures is higher than the pressure prevailing in the filter, the other one being lower than the pressure prevailing in the filter There is also provided an arrangement to produce a relative movement between the filter medium and the at least one nozzle to the effect of having a substantial part of the surface area of the filter medium covered by the nozzle.

Abstract: A method and apparatus for fibrous suspensions in the wood processing industry and more specifically to a so-called drum cylinder, the basic construction of which comprises a vessel, into which suspension being thickened is supplied and a wire-surface cylinder rotating in the vessel. The drum filter is characterized in that the closure member of the drum filter has a channel for leading gas from the filtrate tubes through the compartments of the distribution chamber to the outside of the closing member. The method is characterized in that the operation phase of the filter cylinder is divided into five separate stages. In the first stage, when the cylinder descends on to the vessel, air and the initial filtrate are discharged from the filtrate components and the formation of the pulp web on the wire surface begins. In the second stage, filtrate is discharged with vacuum and the formation of the pulp web continues.

Abstract: An improvement is disclosed which is applicable to the method for filtering an aqueous mineral slurry by flowing the slurry through a ceramic filter plate which is characterized by a porous support layer and an overlying porous filtration layer, the pore sizes in said filtration layer being in the range of from about 1 to 3 .mu.m, and the flow through the filter plate being from the filter layer side toward the base layer, and being effected by establishing a fluid pressure differential across the said filter plate by applying suction to the the porous support layer. The improvement facilitates effective discharge of the filter cake from the plate which accumulates upon the porous filtration layer. According to such improvement the suction is extinguished and the support layer side of the plate is subjected to one ore more positive water pressure pulses to effect a transient reverse flow through the plate.

Abstract: A strainer that is used in association with a motor-driven pump that sucks water out of outdoor pits, reservoirs, streams, ponds, and the like, usually for irrigation or watering purposes. The strainer has a cylindrical screen disposed on a spool-like body for rotation substantially about its own axis. Nozzles that are disposed interiorly of the screen spray water outwardly through the screen to both rotate the screen and to dislodge any debris that may have accumulated on it due to the pump suction force. The screen is a plastic that has a specific gravity of approximately one and it is guided for rotation by the margins of circular discs that form the axial ends of the spool-like body.

Abstract: A cycle of filtration is realized for liquids containing solids in suspension and a rotary filter, suited to realize and cycle, where the filtration is carried out by a rotary drum fitted with a filtering surface (2), immersed in a tank containing the liquid to be filtered (26). The phase of the separation of the filtered material deposited on the filtering surface is preceeded by a phase of removal of the material from the filtering surface carried out by using air blown from a slit and it is followed by a phase of washing of the filtering surface, carried out by a plurality of sprayers.

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 self-cleaning strainer comprises a vertically disposed housing which contains a rotatable strainer basket. The housing has an open top, closed by a closure plate, an inlet adjacent the top of the housing and an outlet adjacent a closed bottom of the housing, the closed bottom having a flush discharge opening. The components used to rotate the strainer basket are disposed outside the flow of any water containing particulates that enters the housing. Cleaning devices such as a scraper blade supported in the strainer basket, a rotatable brush supported in the strainer basket, and a water jet manifold disposed between the housing sidewall and the sidewall of the strainer basket are used to clean the rotatable strainer basket.

Abstract: An apparatus for the removal of oil from large bodies of water, such as oceans. A rotating drum, whose surface is composed of a steel mesh, retrieves oil off the surface of water. An adjustable vacuum is created within the rotating drum, causing contaminated water to pass through and oil to adhere to the steel mesh of the drum. The drum transports the oil to a collection point, where a high pressure water stream from within the drum works in conjunction with a squeegee on the drum surface to remove the oil layer from the mesh. Through the use of Archimedean screws, the oil is then transported up to the collection ship to which the apparatus is attached. Unique rake tines prevent solid debris, such as seaweed, from contacting the drum and subsequently clogging the system. The configuration of the apparatus provides for the connection of several recovery drums side by side, thus expediting the collection and removal of large oil spills.

Abstract: Rotary filter including a perforated, rotatable drum and at least one blowback valve located in close proximity to the interior surface of the drum. In a preferred embodiment, the blowback valve includes an opening adjacent the drum for the discharge of a gas and the opening includes at least one radial position adjusting device alignable with a hole in the perforated drum, whereby the radial position of the blowback valve in relation to the interior of the drum is adjustable externally through perforations in the drum. The external adjustment permits drums longer than possible with prior art rotary filters.

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 self-cleaning vacuum filter, particularly for filtering industrial lubricants and coolants, comprises a tank for the liquid to be filtered containing a filter assembly, the bottom of which communicates with a vacuum chamber connected to a suction device for the liquid. The filter assembly includes a screen and an endless loop of regenerable filter cloth movable in steps over the screen and through a station for the removal of the filtered material, the station extending out of the tank and having a removal device for removing the filtered material from the filter cloth. The removal device includes a roller extending transverse of the filter cloth, substantially in contact therewith, and a motor for rotating the roller at high speed.

Abstract: A device which employs high pressure air to remove oil from a used oil filter of a motor vehicle. High pressure air directed into a central core of an oil filter forces out oil in the filter, thereby permitting the filter to be disposed of in an environmentally safe manner, without the concern that oil may leak from the filter and cause contamination.

Abstract: An apparatus is disclosed for removing ash from repulped wastepaper which contains ash together with cellulosic fibers. The apparatus includes a frame and a plurality of rolls which are rotatably secured to the frame, such that the axes of rotation of the rolls are spaced and parallel to each other. The plurality of rolls include an upstream roll and a downstream roll having a cylindrical outer surface. A porous belt is supported by and extends around the plurality of rolls to define an endless loop. The belt moves between the upstream and downstream rolls for defining a screening portion. A headbox is disposed within the endless loop, and adjacent to the screening portion for ejecting the repulped wastepaper through the screening portion. A drainage device is disposed on the opposite side of the screening portion relative to the headbox for receiving ash passing through the screening portion.

Abstract: Apparatus for extracting liquid from a slurry containing fine solids and liquid comprising an endless screen formed of woven monofilaments of thermoplastic material so as to define a multiplicity of small openings extending between opposite sides thereof and a supporting structure for supporting the endless screen for movement through initial and intermediate operative run portions along an underside thereof in such a way as to present an upper operative side thereof for the accumulation of solids thereon by the passage of liquid through the openings thereof. The screen supporting structure comprises a multiplicity of fixed closely spaced parallel bars formed of material having favorable wear and coefficient of friction characteristics with respect to the thermoplastic material of the endless screen.

Abstract: The invention relates to a method for cleaning the filter plates of a suction drier, which suction drier (20) comprises a tank (13) for the slurry to be suction dried, in connection to which tank there rotates one or several filter disks formed of the said filter plates (14), on the surface or surfaces of which filter plates (14) there is collected and dried, owing to the suction flow passing through the filter plates (14), a filter cake, which is scraped or otherwise removed from the surface or surfaces of the filter plates. For the cleaning of the porous structure and surfaces of the said filter plates (14), there is arranged, in the tank (13) of the slurry to be filtered, under the liquid surface (11), mainly in the surface water area, an ultrasonic vibrator or vibrators (10), whereto ultrasonic electric power is fed from an ultrasonic generator (22). The cleaning with the ultrasonic vibrator or vibrators (10) is carried out esentially immediately after scraping.

Abstract: The filtering apparatus of the invention comprises a filter housing having a water inlet and a water outlet as well as a filter bell dome connected to the housing. A main filter member and thereabove a reversing flow filter member are coaxially arranged on a filter support member located in the interior of the filter bell dome. The filter support member is spirally movable within the filter bell dome. Further, reversing flow filter member cleaning brushes and main filter member cleaning brushes are fixedly mounted in said filter bell dome. In the operating position, the passage through the reversing flow filter is obstructed such that the water to be filtered flows through the main filter member from the exterior to the interior thereof. In the backwashing position, the filter support member is spirally displaced and simultaneously obstructs the direct access to the exterior of the main filter member.

Abstract: A method of stabilizing pressure and flow conditions in a screening apparatus for treating a pulp is described, the pulp being supplied continuously to the screening apparatus through an inlet and passed through a pulp space along a screen of a screen body and discharged continuously through an outlet, said screen body being moved axially with a forward-going movement during an extraction phase and a backward-going movement during a backflushing phase. The flowrate of the pulp through, and the pressure conditions in, the treating zone of the screening apparatus are controlled by altering the volume at the inlet end and outlet end of the screening apparatus during the movement of the screen body.

Abstract: An apparatus for dewatering and squeezing a water containing material comprises a drum with a sieve mantle defining two co-operating drum sections, each comprising a feed screw extending therein. The first section of the drum in the feed direction is formed for dewatering of the material mainly by self-drainage. The first drum section is rotatable and is provided with means for cleaning the sieve mantle holes. The second section is formed for increased compression of the material, and has a thread height for the feed screw smaller at the outlet of the second section than at the inlet to this section.

Abstract: A filtration apparatus characterized by efficiency of the precoating step and maintenance of filtration performance over a long period of time after precoating has been completed. The filter promotes parallel flow of porous precoat material along a porous septum, thereby achieving efficient stacking of this material against the septum. A dual-speed pumping system transmits the precoat material to the septum at high velocity, thereby further encouraging efficient stacking, but pumps the fluid to be filtered at a lower velocity to minimize energy consumption.

Abstract: A process is disclosed for recovering a cellulose ether from a cellulose ether suspension in which the cellulose ether is recovered as a filter cake from a pressure filtration, particularly using a rotary pressure filter. Clogging of the separation or filtration device is avoided, providing for a long useful life. A multi-layer wire mesh filter medium is employed, formed of mesh layers of different wire thicknesses and/or mesh size. After removal of the filter cake, the filter medium is cleaned with steam, compressed air or pressurized water.

Abstract: Method in a suction dryer (10), which comprises a basin (12) for a suspension to be suction-dried, in connection with which basin one or several filter-plate discs (14a) revolve, onto whose faces a filtrate cake is gathered and dewatered by the effect of a suction flow passing through the filter plates (14a), the said filtrate cake/cakes being scraped or otherwise detached from the faces of the filter plates (14a). For the purpose of cleaning the porous structure and faces of the filter plates (14a), an ultrasonic detector or detectors (30) are provided in connection with the basin (12) for the suspension to be filtered, to which detectors an electric power of ultrasonic frequency is fed from an ultrasonic generator (32). For the time of the cleaning intensified by ultrasound, the suspension basin (12) is filled with a connecting and cleaning liquid, e.g. water.

Abstract: An improved filtration for treating waste product which comprises a pair of filter belts, a plurality of squeezing rollers operatively connected to the filter belts, a plurality of fixed sprayers in the vicinity of the plurality of rollers for spraying hot steam, heating members for heating the rollers with hot steam, hot water, or hot air in the interior thereof, and a pair of cleaning members for cleaning and washing the belts, whereby the waste product is easily filtrated and dehydrated through the coaction between the belts and the plurality of rollers, and the belts are washed clean by the cleaning members.

Abstract: A filter apparatus for separating solids from a liquid in a slurry, is cleaned by a jet and a sludge removal device. The filter is generally flat and has an inflow side on which the solids are deposited and an outflow side supported by a grid. The grid subdivides the outflow side into a plurality of separate injection chambers and defines a plurality of separate small regions of the filter material. The jet directs a stream of liquid through one of the injection chambers and against one of the small regions of the filter defined by the injection chamber. A cover plate is provided on the jet for engaging the grid to close one injection chamber opposite the filter material. The sludge removal device is located on the inflow side of the filter and is aligned with the jet to receive solids dislodged from the filter. The jet and sludge removal device more simultaneously and in alignment with each other to close selectively and to direct a stream of liquid through each of the injection chambers.

Abstract: Screen cleaning showers for a sludge dewatering rotary screen thickener are kept open and effective by periodically rotating a steel wire brush positioned coaxially within the cleaning shower manifold. Shower nozzles are set into the manifold to assure full mechanical wiping of a nozzle interior surface by the axially rotating brush bristles. Brush rotation is motor driven. An automatic controller periodically and simultaneously rotates the nozzle cleaning brush and opens a normally closed solenoid valve in the shower manifold drain line.

Abstract: A device for mechanically purifying liquids in a pipeline includes a rotation-symmetrical sieve chamber forming a section of the pipeline and having an inlet with a central axis, a rotation-symmetrical sieve body having an inner surface and being disposed in the sieve chamber at an angle of substantially 30.degree. to 60.degree. relative to the central axis of the inlet, and a suction removal device for removing deposits from part of the inner surface of the sieve body, the suction removal device being coaxial with and upstream of the sieve body in flow direction of the liquid, and the sieve body and the suction removal device being rotatable relative to each other for successively sweeping all of the inner surface of the sieve body with the suction removal device.

Abstract: A fluid filtering system which includes a fluid filtering unit having a localized cleaning arrangement. The fluid filtering unit comprises a filter element through which the fluid being filtered is passed and structure for cleaning the filter element without interruption of the filtering operation of the unit. The cleaning structure includes a cleaning head which ejects fluid under pressure and which is moveable relative to the filter element to bring about localized cleaning of the element. Preferably, the filter element is moved, by an hydraulic arrangement to bring about localized cleaning over the whole of the filter element.

Abstract: A filtration apparatus includes a tapered conveying cylinder, a rotating filtration cylinder disposed around the tapered conveying cylinder, a pair of spaced-apart driving members movably supported to the rotating filtration cylinder for freely changing a size of a treatment zone between the tapered conveying cylinder and rotating filtration cylinder and one or more steam injection pipes disposed above the rotating filtration cylinder. The solid waste product in the treatment zone is heated and cleaned away by spraying the surface of the cylinder with hot steam through nozzles of the injection pipes, and freely changing the size of the treatment zone on demand.

Abstract: A filter arrangement comprises a belt filter for the separation of particles from a liquid, for which purpose the liquid is caused to flow towards the filter through an inlet (13) at one end of the filter, and the separated particles are collected at the opposite end. The belt filter consists of an endless filter belt (10) which runs over guide rollers (2, 3) in the direction of the water as it flows in, and supports and drains the particles as they are conveyed on an upper, forward-moving part of the filter belt from one end to the opposite end over a first drainage zone. A second drainage zone is arranged on the upper part (11) of the belt by the arrangement of a drainage arrangement (17) which comprises a blower unit (18) extending across the entire width of the filter belt (10) to direct currents of air against the under-side of the upper part (11) of the filter belt (10), so as to blow water from the belt and the particles over the second drainage zone.

Abstract: A rotary self-cleaning strainer comprises a circular cylindrical walled PVC pipe on which a circular cylindrical filter screen assembly is journaled for rotation. The PVC 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 PVC pipe. The filtered water is conducted through the PVC pipe and to the pump. A nozzle structure disposed within the filter screen assembly is supplied with water from a separate supply line connected to the strainer. The water is forcefully emitted against the screen to both rotate the screen assembly and dislodge adhering debris from the exterior of the screen. The strainer also has a lip type seal and a series of wheels which seal and journal one axial end of the filter screen assembly to and on the PVC pipe.

Abstract: A filter device comprises a central tube, a housing enclosing the central tube and defining an internal chamber therewith, and a filter body within the internal chamber. The central tube includes a plug between the inlet and outlet which directs the fluid to flow from the inlet through the filter body and out through the outlet. The housing and filter body are mounted for sliding movement axially of the central tube from a normal filtering position wherein the housing inlet communicates with the upstream side of the filter body, to a back-flushing position wherein the inlet communicates with the downstream side of at least a portion of the filter body. The housing may also include a valve member moved therewith under differential pressure between the housing inlet and outlet to regulate the pressure at the outlet.

Abstract: An apparatus for separating solids from various types of liquid is disclosed, which includes a vessel for a filtrate arranged adjacent to one side wall of receiving vessel for a solid-containing liquid, and a disc screen arranged at an opening of the side wall using a liquid seal, the disc screen being connected to a rotary shaft which in turn is connected to a driving source, while the disc screen at its surface of the filtrate vessel side being opposed with a submerged ejecting nozzle for a washing fluid thereby to backwash the disc screen during its rotation, resulting in an excellent solid/liquid separator having capability of preventing the clogging of the solids in the screen and continuous operation, as well as the compactness and high capacity of the apparatus. The apparatus according to the invention may be applied effectively to the separation of, for example, chips from a coolant for various machines.

Abstract: A backwashable filter comprises (a) an outer case, (b) a rotatable, permeable filter drum, (c) a fibrous filter element supported on the surface of the drum, (d) one or more stationary backwash arms, (e) a feed inlet leading to one side of the filter drum and (f) a filter outlet emerging from the other side of the drum. The backwash arms are in close contact with the filter element. The tendency of the feedstock to bypass the filter and enter the backwash arms is thereby reduced.

Abstract: The present invention relates to a filtration apparatus which includes a tapered, rotary cylinder, a rotary filtration cylinder disposed around the tapered, rotary cylinder and a fixed steam injection pipe disposed above the rotary filtration cylinder whereby solid waste material which is conveyed in the rotary filtration cylinder and is heated, and which collects in the holes of the rotary filtration cylinder is cleaned away by spraying the surface of the rotary filtration cylinder with hot steam through the nozzles of a fixed injection pipe.

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: In a method and device for filtering a suspension of particles in a liquid the liquid is passed continuously through a porous membrane, particles from the suspenion gradually accumulating on the membrane and clogging its pores. The filtered liquid is caused to flow momentarily in the reverse direction to return the accumulated particles to the suspension and so unclog the membrane. To achieve this the filtered liquid is fed into one end of a conduit wound around an axis and recovered from its other end, and the conduit is rotated about its axis, the speed of rotation gradually increasing, and then suddenly stopped.

Abstract: In a system for separating solids from a liquid in a slurry, a filter apparatus is cleaned by a jet and a removal device. The filter is generally flat and has an inflow side on which the solids are deposited and an outflow side supported by a grid. The grid subdivides the outflow side into a plurality of separate injection chambers and defines a plurality of separate small regions of the filter. The jet directs a stream of liquid through one of the injection chambers and against one of the small regions of the filter defined by the injection chamber. A cover plate is provided on the jet for engaging the grid to close one injection chamber opposite the filter. The removal device is located on the inflow side of the filter and is aligned with the jet to receive solids dislodged from the filter. The jet and removal device move simultaneously and in alignment to close selectively and to direct a stream of liquid through each of the injection chambers.

Abstract: Apparatus for the release and recovery of living organisms collected or trapped on the rotary filters of water pumping stations.The apparatus comprises:on the inside of the filters, a system of two rows of multiple washing jets using water under low pressure, whose nozzles are directed towards the filter panels, so that the jets of the two rows meet one another and cooperate to form a single liquid stream;deflectors arranged at radial intervals on the outer face of the filter panels;on the outside of the filters, a channel shaped like a trough for receiving the washing water and recovering the living organisms, whose opening is oriented towards the said rows of washing jets, the edge of the opening being rounded or rotary in its lower part.

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.