Abstract: A self-priming filter holder for filtration of intravenous liquids is provided and is formed of one or two housing portions sealed to a core portion. The core portion has one or two ribbed surfaces forming a plurality of flow paths sealed at one end and open at a second end and at least one channel preferably larger than the flow paths. The channel(s) is in fluid communication with the flow paths and an outlet. An inlet is provided to the interior of the housing portion(s) which are sealed from the ribbed surfaces by hydrophilic membranes. The housing portion(s) can be provided with gas vents sealed with hydrophobic membranes. Fluids pass through the flow paths in one direction and through the channel(s) in an opposite direction to remove gas from the flow paths and channels prior to use.

Abstract: A liquid purifying porous filter and a filter assembly employing the same can significantly improve filtering performance for impurities in the drinking water, liquors, liquidous seasoning or pool water and can perform back washing while purifying operation is maintained. The filter assembly is small in size, compact and easy to handle, and achieves high performance both in senses of quality and quantity, and is capable of performing back washing while maintaining operation, is compact and is easily installed.

Abstract: A filter apparatus for filtering machine tool coolant is disclosed as including a drum filter or a disc filter assembly including a hollow rotatable mandrel mounting a drum filter assembly or plurality of removable hollow disc filter elements each element having a foraminous non-reticulated metal screen having minute openings and a smooth planar surface for providing improved scrape cleanability and preventing movement of machining chips, particulate and also elongate contaminants from one side of the filter to the other side thereof.

Abstract: Embodiments of this invention include pressure differential barrier members for separating selected substances from fluid, gaseous and/or liquid, and methods of making same. They include separation material which, with respect to the fluid to be treated, is pervious and exhibits desired separation capabilities. They may also, at least in part, include material which is substantially impervious to the fluid. They include bridges spanning flow paths to form lateral flow paths, and they may also include flow paths that are unbridged. All flow paths through such embodiments are either through structural elements which themselves have desired separation capabilities or are occupied by separation material that is pervious to the fluid being treated and is of such desired characteristics.

Abstract: A candle type precoated filter for residual volume filtration has a pressure vessel having a cylindrical upper part and a conical base, a plurality of filter elements arranged substantially vertically and including at least one residual filter element and other filter elements formed so that the at least one residual filter element is lengthened toward the base and is longer than the other filter elements and a separating wall which separates the residual filter element in an upper portion of the pressure vessel from the other filter elements so as to be tight against media and to project out in a lower portion of the pressure vessel beyond a length of the other filter element.

Abstract: A pressure filter includes a pressure vessel having a pressure chamber and a circumferential edge; a turntable rotatably mounted within the pressure vessel about a horizontal axis; a plurality of filters non-rotatably mounted to the turntable and spaced apart from each other at the circumferential edge of the pressure vessel and rotatable around the horizontal axis through a center of the pressure vessel such that the plurality of the filters continuously dip into and out of a solid solution in a bottom of the pressure chamber. A blow-off station is positioned above the solid suspension in the pressure chamber for freeing filter cake that has dried on the plurality of filters. A filter cake conveyor conveys the blown-off filter cake through a pressure lock in the pressure vessel.

Abstract: A modular table filter for a circular horizontal rotating table filter includes a number of sections which may be assembled on the support frame thereof. The sections are annular-sector-shaped and, when assembled, form an annulus on the table filter. Each section, in turn, may be broken down into an outer subsection and an inner subsection. Filtration fabric, or textile, may be placed on top of the outer subsection, and secured therein by the inner subsection, which is designed to lock thereinto. Alternatively, each section may be an integral annular-sector-shaped frame having a peripheral groove or channel. Filtration textile may be placed on top of the frame, and over the groove or channel, and wedges driven thereinto to hold the fabric tautly across the frame.

Abstract: A filtration apparatus specifically intended for removing particulate contaminants from commercial laundry waste water has at least one porous mesh-like filter bag coupled between an inlet manifold for receiving waste water containing particulate contaminants and an outlet manifold for discharging the particulate contaminants separated from the waste water. The filter bag is agitated by a paddle, so as to prevent the mesh-like material of the filter bag from being clogged. Also disclosed is a method for filtering waste water containing particulate contaminants.

Abstract: A filter sector for a filter disk of a rotating filter having a plurality of such filter sectors includes two spaced plate-shaped elements formed from a relatively thin material and defining main planes. Protrusions outwardly extend from the main planes and are shaped out of the material of the plate-shaped elements. The protrusions are adapted to keep a filter cloth at a distance from the main plane. Interior bulbs shaped out of the material of the plate-shaped elements extend from the interior sides of the plate-shaped elements. The protrusions and the interior bulbs have a material thickness substantially corresponding to the material thickness of the main plane. The interior bulbs are adjoined at engaging contact surfaces to provide strength and torsional rigidity to the sector.

Abstract: A disc filtering apparatus for filtering liquids, such as fiber pulps suspensions, includes hollow filter discs, each of which has two opposed side walls of filter material. A plurality of circumferentially spaced support arms extend within each hollow filter disc, for supporting the side walls of filter material. Between the support arms, each side wall of filter material is supported by at least one wire member extending substantially along the filter disc and attached to the support arms.

Abstract: Disclosed is a filter assembly for use in a baghouse having a cell plate provided with openings. The filter assembly includes a collar, filter bag, tubular supporting cage and locking ring. The filter bag filters particulate material and extends from below the cell plate. The collar supports the filter bag and has a longitudinally extended portion and a flange portion. The longitudinally extended portion is affixed to the filter bag below the cell plate, while the flange portion extends along the cell plate as a rim above a respective opening. The collar acts as a gasket to seal a respective opening in the cell plate. The tubular supporting cage has a longitudinally extended portion that structurally supports the filter bag. The locking ring is integrally fixed to the supporting cage and locks an arrangement of the filter bag, collar and cage in place. The locking ring also can include a venturi affixed thereto to assist in filtering and cleaning operations.

Abstract: A filter for fluids includes a pair of layers or multiple layers or pairs of material joined together to form a laminate having a fluid contacting surface. A plurality of spaced pockets is formed between the layers of material in the contacting surface. The layers of material are fluid permeable at the pockets whereby fluid may flow through the laminate at the pockets. The fluid contacting surface is fluid impermeable except for the pockets to require the fluid passing through the laminate to be confined to flowing through the pockets. Filter members are in the pockets for removing any contaminants from the fluid.

Abstract: A filter-collector apparatus comprising a closed vessel having in inlet for introducing pneumatically conveyed material thereinto and an outlet for discharging material therefrom, a detachable tube sheet disposed in the vessel and cooperating with the vessel to provide a material collector chamber and a plenum chamber, wedging means for detachably securing the tube sheet to the vessel, at least one filter tube extending through an opening in the tube sheet and into the collector chamber, having the interior thereof communicating with the plenum chamber, wedging means for detachably securing the filter tube to the tube sheet, means disposed in the plenum chamber for selectively injecting a stream of fluid under pressure into the filter tube for dislodging filtered material deposited on the filter tube, means for detachably securing the fluid injecting means to the tube sheet and the vessel having outlet means communicating with the plenum chamber.

Abstract: Disclosed is a filter assembly for use in a baghouse having a cell plate provided with openings. The filter assembly includes a collar, filter bag, tubular supporting cage and locking ring. The filter bag filters particulate material and extends below the cell plate. The collar supports the filer bag and has a longitudinally extended portion and a flange portion. The longitudinally extended portion is affixed to the filter bag below the cell plate, while the flange portion extends along the cell plate as a rim above a respective opening. The collar acts as a gasket to seal a respective opening in the cell plate. The tubular supporting cage has a longitudinally extended portion that supports the filter bag. The locking ring locks the filter bag, collar and cage in place. The locking ring can include a venturi affixed thereto to assist in filtering and cleaning operations.

Abstract: A filter assembly particularly useful for the nuclear industry is provided with a number of cylindrical cartridge filters attached to a plenum chamber which is formed by a rotational moulding process. A rod is provided on the assembly which can be attached to an automatic handling device to allow remote fitting and removal of the filter assembly into and from a casing. The assembly is easy and cheap to manufacture and can be destroyed after use.

Abstract: A filter assembly includes a housing having an inlet and an outlet, at least two filter elements stacked inside the housing, and a spacer positioned between the filter elements. The spacer includes a body having an opening which is larger than the inner diameter of at least one of the filter elements and is no smaller than about one-third of the outer diameter of a filter element. The spacer is free of any structure which extends into the opening.

Abstract: A rotating disc filter has a plurality of discs, each made of a plurality of sectors removably mounted on support structures which are fixed on a rotating hollow shaft into core drainage channels of which, the sectors drain. The drainage and support structure has flow channels designed to rapidly drain filtrate and to permit filtrate split between clear and fiber bearing fractions. Rapid drainage is made possible by a novel method and device for controlling fluid transit volume within the sectors.

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: A filter sector for a filter disk of a rotating filter, including folded or currugated means having ridges and valleys extending in a longitudinal direction of said means to form filtrate channels, and a filtering medium covering said means. Said means includes at least two elements (9, 10), each having parallel riges (12, 11') and valleys (11, 12') and said at least two elements are located in an at least partly overlapping relationship, such that filtrate channels (13) of one element (9) intersect with filtrate channels (14) of the other element (10). Preferably, the filter sector includes two at least substantially equally shaped elements and said elements are disposed such that there is communication between filtrate channels (13, 14) of said elements (9, 10) in zones of said partly overlapping relationship.

Abstract: A disk-type filter comprising a housing having an inlet connectable to an upstream pipe and an outlet connectable to a downstream pipe, and a stack of filter units disposed within said housing for separating solid particles from a fluid flowing between filter units in said stack of filter units from an upstream side of said stack of filter units to a downstream side thereof, characterized in that said stack of filter units includes a plurality of co-operating filter units defining a plurality of paired co-operating filter surfaces, including first and second surfaces each defining a plurality of fingers, said fingers defined by said first surface being arranged in registration with said fingers defined by said second surface, the exteriors of said fingers defined by said first and second surfaces communicating with either one of an upstream side and a downstream side and the interiors of said fingers defined by said first and second surfaces communicating with the other one of said upstream side or downstream

Abstract: Disclosed is a filter assembly for use in a baghouse having a cell plate provided with openings. The filter assembly includes a molded collar, filter bag, tubular supporting cage and locking ring. The filter bag filters particulate material and extends from below the cell plate. The collar supports the filter bag and has a longitudinally extended portion and a flange portion. The longitudinally extended portion is affixed to the filter bag below the cell plate, while the flange portion extends along the cell plate as a rim above a respective opening. The collar acts as a gasket to seal a respective opening in the cell plate. The tubular supporting cage structurally supports the filter bag and has a longitudinally extended portion and a collar portion. The longitudinally extended portion supports the filter bag, while the collar portion partially overlaps the flange portion of the collar. The locking ring locks the filter bag, collar and cage in place.

Abstract: A filter screen assembly for removing particulate material from a slurry in a vessel. Mass producible slotted faced plates are assembled in pairs to enclose a chamber means between two slotted faces, an apertured edge and three closed edges mounted on a collector tube with the chamber in communication with the bore of the tube through said apertured edge, one end of the tube being closed and the other end being in communication with an intake port of a pump and said chambers. A filter media envelopes assembled pairs of slotted faced plates and the portion of the collector tube they are mounted on, while the other portion of the collector tube projects from an opening in said envelope and is sealingly engaged by a collar portion of the media secured against the collector tube. Reduced pressure impressed on the interior of the collector tube causes a slurry of liquid and particulate no greater than a predetermined size to be drawn through the media and slots in the plates.

Abstract: A disk-type filter comprising a housing having an inlet connectable to an upstream pipe and an outlet connectable to a downstream pipe and a stack of filter units disposed within the housing for separating solid particles from a fluid flowing between filter units in the stack of filter units from an upstream side of the stack of filter units to a downstream side thereof, characterized in that the stack of filter units includes a plurality of co-operating filter units defining a plurality of paired co-operating filter surfaces, including first and second surfaces each defining a plurality of fingers, the fingers defined by the first surface being arranged in registration with the fingers defined by the second surface, the exteriors of the fingers defined by the first and second surfaces communicating with either one of an upstream side and a downstream side and the interiors of the fingers communicating with the other one of the upstream side or downstream side, spaces being defined in association with the fin

Abstract: A tangential flow filtration apparatus which utilizes a single manifold formed of a stack of manifold segments to introduce liquid to be filtered into the apparatus and to remove a filtrate stream and a retentate stream from the apparatus is provided. A plurality of filtration modules are stacked between the manifold and a plate. Holes and sealing means are provided within the filtration modules to effect flow of the filtrate, retentate and feed liquid through the stack and manifold while preventing admixture of the filtrate with the retentate or the feed liquid. A feed manifold is positioned at an intermediate position within the stack of manifold segments. All manifold segments with the exception of the most downstream manifold segment or most upstream manifold segment from the point of introducing incoming liquid must have a filtrate exit from both ends of the manifold segment. The most downstream or the most upstream manifold segment also can have filtrate exits from both of its ends.

Abstract: A filter apparatus for use in filtering a fluid is provided. The filter apparatus has a plug-in, quick-connect cartridge. The filter apparatus has walls forming a first chamber and a second chamber. The filter apparatus also has a diaphragm having a first surface and having a second surface for separating the chambers. The diaphragm has an aperture with an inner surface for receiving the cartridge. The cartridge has a connector member for attachment to the diaphragm, and has a filter member for filtering the fluid passing between the chambers. The first and second chambers have respective inlet and outlet ports. The connector member has an upset portion which bears against the diaphragm first surface. The connector member also has an extended portion, which extends through the aperture. The extended portion has a groove, which has a snap locking ring that bears against the diaphragm second 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: In a method for filtering a suspension through a stationary filter having a vertical filter element arranged in a pressure vessel and for re-conditioning the filter after filtering, the filtrate is discharged from the bottom of the filter element during the main part of the filtering. After filtering, unfiltered suspension is discharged in a known manner from the pressure vessel later to be returned to the suspension inlet. Thereafter, back-wash is performed with another medium other than filtrate, an outlet for material deposited on the filter element being opened for removal of said material together with the back-washing medium. Preferably, before back-wash, drying of the material deposited on the filter element takes place by means of a gas medium circulating within the filtering plant.

Abstract: A tangential flow filtration apparatus which utilizes a single manifold formed of manifold segment or manifold segments to introduce liquid to be filtered into the apparatus and to remove a filtrate stream and a retentate stream from the apparatus is provided. A plurality of filtration modules are stacked between the manifold and a plate. Holes and sealing means are provided within the filtration modules to effect flow of the filtrate, retentate and incoming liquid through the stack and manifold while preventing admixture of the filtrate with the retentate or the incoming liquid. All manifold segments with the exception the most downstream manifold segment or most upstream manifold segment from the point of introducing incoming liquid must have a filtrate to exit from both ends of the manifold segment. The most downstream or the most upstream manifold segment also can have filtrate exits from both of its ends.

Abstract: Multichamber-candle filter element for filtration of a residual volume of a suspension with rapidly settling solid components, includes at least two chambers (1,2) positioned in succession above each other, a lowest of the chambers being from 1/3 to 1/10 of a total length of the candle filter element, and a separate filtrate delivery pipe (8,9) extending into each of the chambers to provide a separate filtrate outlet for each chamber and a partition member separating each of the chambers from each other in a fluid-tight manner. The multi-candle filter element also has a fluid-tight cover plate (6) and a fluid-tight bottom plate (3) and fluid permeable walls (14,15).

Abstract: A filter for cylindrical of flat filter equipment for the mechanical purification of liquids as described which is assembled of several filter elements (4) arranged one above the other which disclose always gap-shaped filter openings between them and which are fastened by rods led through them and locking flanges. The passage openings for the rods are formed as sleeves (7) to which distance holders (8) belong. The filter elements have trapezoidal cross-section, the outer longer base side (16a) of which, together with the height of a filter opening, make out the height of the sleeve (7).

Abstract: A method and apparatus for cleaning filter elements that are vertically positioned within a filter vessel that has a tube sheet dividing the filter vessel into a lower filter compartment and an upper plenum compartment. A fixed volume of backwash liquid is rapidly directed from the plenum compartment above the tube sheet through the filter elements into the filter compartment that has been drained of liquid. The rapid movement of the backwash liquid is a result of a pressure differential between the plenum compartment and the filter compartment. The volume of backwash liquid is maintained above the tube sheet by a pressurized condition in the filter compartment, which volume may be changed by adjusting the pressure in the filter compartment.

Abstract: The filter unit is of the type comprising a casing (2), filter tubes (5) associated with a filtering surface (6), shaker means (7) for the filtering surface (6), a suction pipe (10) associated with the casing and a suction pipe (11) associated with one or more turbines and characterized in that the casing (2) comprises above the filtering surface (6) at least two separate chambers (13,13') each independently connected to the suction pipe (11) associated with one or more turbines.

Abstract: A modular filter assembly is described comprising a filter stack having a plurality of filter sheets and a plurality of filter support plates each having a perimeter and an internal filter flow passageway portion. The filter sheets are sandwiched between surrounding filter support plates forming the stack and the filter flow passageway portions of the plates and filter sheets are aligned to form a filter flow passageway extending from the top to the bottom of the stack. The filter stack has engaging means capable of keeping the filter support plates together while minimized top to bottom dimension because it is not necessary to use external clamps for keeping the support plates together. Also described are support plates for modular filters and a method for forming a modular filter assembly.

Abstract: In a filter device with a filter stack (32) which is held in sealing position by two end plates (9, 2). At least one of which comprises fluid connections (3, 4, 5), and consists of round flat-filter elements (41) and alternatingly arranged, congruent, draining support elements (38), the end plate (2) comprising the fluid connections (3, 4, 5) is part of a housing (1, 2) surrounding the filter stack (32) and the peripheral approach flow of the filter stack (32) takes place via an annular housing space (11). The filter stack (32) is penetrated approximately in the direction of its diameter by a slot-like shaft (30, 30') for the fluid guidance of the retentate which shaft empties in the end plate (2) comprising the fluid connections (3, 4, 5). At least one permeate shaft (31) for removing the permeate from the plane of the filter elements (41) is arranged in the diametric end area of the stack surface. The permeate shafts (31) empty in the end plate (2) with connections (3, 4, 5).

Abstract: A filter segment disc of a segment filter comprises a support and drainage plate with slots radiating from the filter hub toward the filter edge. The slots are configured to provide a substantially uniform fluid flow over the filtering medium of the filter segment, reduce residence time of filtrate in the filter, eliminate dead spots in the flow, and facilitate cleaning of permanent filters.

Abstract: A disk-type filter comprising a housing having an inlet connectable to an upstream pipe and an outlet connectable to a downstream pipe, and a stack of filter units disposed within said housing for separating solid particles from a fluid flowing between filter units in said stack of filter units from an upstream side of said stack of filter units to a downstream side thereof, characterized in that said stack of filter units includes a plurality of co-operating filter units defining a plurality of paired co-operating filter surfaces, including first and second surfaces each defining a plurality of fingers, said fingers defined by said first surface being arranged in registration with said fingers defined by said second surface, the exteriors of said fingers defined by said first and second surfaces communicating with either one of an upstream side and a downstream side and the interiors of said fingers defined by said first and second surfaces communicating with the other one of said upstream side or downstream

Abstract: A pressurized liquid filter in which a series of spaced apart, vertically extending filter plates are mounted between the sides of housing, inflatable hose seals extending across each top entrance and bottom exit. Filter media strips are draped vertically into the spaces, each disposed over a perforated sheet forming the outer layer of either side of each filter plate. The space between each pair of filter plates is subdivided into two filtering chambers by a dual element dewatering diaphragm mounted in a frame disposed centrally in each space. Liquid slurry is introduced into each chamber under pressure, flow induced to pass through the filter media strips and passing into vertical passages in the filter plates and into collection troughs extending along each row of passages.

Abstract: A filter bag (1) for a disc-like filter, comprising filter surfaces (2) to be positioned on both sides of a filter element. The filter element is inserted into the filter bag, and the filter bag is heated so that the heated portion shrinks, thus tightening the filter bag around the filter element. The filter bag (1) is so shaped that the filter parts (2) to be positioned on both sides of the filter element are substantially of the same shape and size as the required filter surfaces. An edge part (3) of a material substantially impermeable to liquid and shrinkable at elevated temperature is attached to the edges of the filter parts.

Abstract: A backflushable filter including a housing having an inlet coupled to an upstream fluid inlet and an outlet coupled to a downstream fluid outlet, a filter assembly including a plurality of cylindrical filters, defining an upstream surface communicating with the inlet and a downstream surface communicating with an axial hollow volume therein, the axial hollow volume communicating with the outlet, a backflushing assembly comprising a backflushing nozzle disposed in each axial hollow volume for backflushing engagement with each of the cylindrical filters at its downstream surface, and a backflush drain communicating with the upstream surface.

Abstract: A spacer element for guiding flowing medium, especially for apparatus for separating the medium by reverse osmosis and ultrafiltration, with a respective filter element being accommodated between each two essentially plate-like spacer elements, about which the medium flows. The spacer element includes a plate member having a rim region in which is provided at least one passage for the flowing medium. The plate member has two oppositely disposed plate-like surfaces, on at least one of which are disposed a plurality of raised bosses that project from the surface, with the filter element resting on the bosses. The filter element is in the form of a diaphragm pad, with the medium flowing on both sides thereof.

Abstract: A filter apparatus for use in filtering a fluid is provided. The filter apparatus has a plug-in, quick-connect cartridge. The filter apparatus has walls forming a first chamber and a second chamber. The filter apparatus also has a diaphragm having a first surface and having a second surface for separating the chambers. The diaphragm has an aperture with an inner surface for receiving the cartridge. The cartridge has a connector member for attachment to the diaphragm, and has a filter member for filtering the fluid passing between the chambers. The first and second chambers have respective inlet and outlet ports. The connector member has an upset portion which bears against the diaphragm first surface. The connector member also has an extended portion, which extends through the aperture. The extended portion has a groove, which has a snap locking ring that bears against the diaphragm second surface.

Abstract: An integral filter leaf assembly comprising microporous polymeric filter cloths heat-bonded to the apices of an undulating screen to form a strong unitary pressure resistant filter unit which essentially replaces filter leaf assemblies. The screen and felt sides of the filter cloths are preferably heat sealable thermoplastics, usually polypropylene to allow heat-bonding and heat-sealing of seams throughout for a unitary assembly strong in compression. Outer filter coat is preferably porous expanded polytetrafluoroethylene. Optionally, a circumferential stiff load-bearing frame may be enclosed within the assembly.

Abstract: A cell-type filter cartridge is disclosed having netting thereon, as well as a method for producing same. Briefly stated, the surface area of filter material exposed to unfiltered fluid has disposed thereon a netting thereby preventing flaking, cracking and the like of filter media during backflow or cleaning operations. The netting is secured to the cell by a molded circumferential retainer and a circumferential centrally disposed ring.

Abstract: This invention relates to a filtering apparatus for filtering liquids, in particular beverages. To attain an effective seal between two superimposed filter supports and the associated filter bodies in such a filtering apparatus, the upper side of an underlying filter support has formed therein a groove which opens upwards and has a substantially trapezoidal cross section and whose interior groove wall is substantially parallel to the inner wall of the apron of the filter support respectively lying thereabove, and the profiled seal has, on the whole, a substantially rectangular cross section, with the profiled seal portion supported on the respectively lower filter support being adapted to the cross section of the groove.

Abstract: A closed, cross-flow fluid filter assembly having a pressurized input line for polluted fluids entering into a closed header box. The closed header box fits within a filter tank and is provided with apertures and spacer assemblies on the bottom wall thereof communicating with the filter tank, the apertures providing the pressurized fluid thereto. Filter leaf assemblies are arranged in parallel within the filter tank and are maintained at their top edges in spaced relation by the spacer assemblies. The filter leaf assemblies are composed of abutting offset grids, contained within a fluid tight frame which is covered on each side by a filter media. The filter leafs are drained of filtrate through a medial tube connected to a central manifold which is connected to a vacuum source. Flow-through backwash stop-grids are arranged in the filter tank to prevent excessive bulging of the filter membranes during backwash for cleaning of the filter media.

Abstract: A filter for thickening fiber suspensions or other liquids containing solid material includes a plurality of rotatable filter disks (3) mutually spaced in axial direction and adapted to be partially submerged in a liquid (5) to be filtered. Each filter disk includes a plurality of filter sectors (4) communicating with axial filtrate discharge ducts (2) at the outer peripheries of the filter disks (3) for removal of filtrate. The axial filtrate discharge ducts (2) are open to atmosphere at at least one end (2') thereof for the purpose of conducting air through these ducts into the interior of the filter sections to replace filtrate flowing out. Advantageously, there is communication between all axial filtrate discharge ducts through annular filter disk holders (1) carrying the filter sectors (4) of the filter disks.

Abstract: A universal swimming pool water filter apparatus for a bottom opening tank comprising multiply useful dual reverse flow port means and cooperating filter medium support having various filtered water passing openings arranged to accommodate fixed cloth or free particulate filtering media, the port means flow being varied with the type of filtering medium support so that a minimum of different production parts are needed to meet all filtering needs, with a consequent reduction in manufacturing equipment and parts inventory.

Abstract: A stacked permeable membrane envelope assembly comprises two clamping plates with spaced, permeable membrane envelope assemblies clamped between them on frames. Each membrane envelope comprises two membrane covered, perforated plates clamped together to provide inner permeate chambers and outer feed fluid passages. Fluid distributing and permeable membrane sealing collars are provided comprising two annular plates with a radially scalloped, stiff-spring-like, channel separator ring located between them. The annular plates seal the membranes against the dished plates around feed fluid passages through the envelope assemblies while the radial scallops form passages for fluid to flow between adjacent membrane envelopes.

Abstract: A filter screen assembly for removing particulate material from a slurry. The assembly includes filter media for accumulating particulate of larger than predetermined size as filter cake exteriorly of plates having a plurality of slots therein. A hook member along an edge of each of the plates engages a tubular distributor having slots therealong. Each of the slots of the tubular distributor receives the hook member of one of the plates so that the plates are mounted on the tubular distributor. Other edges of the plates are connected to form chamber means therebetween. The chamber means communicates with the interior of the tubular distributor. A reduced pressure is impressed on the interior of the tubular distributor to cause liquid of the slurry to be drawn through the slots in the plates so that the particular material collects on the outside of the plates.

Abstract: In a disk-type decker that is employed to drain suspensions and that has axially distributed suspension chambers and filtrate chambers that are separated by rotating screen disks and open into a stationary tub, the filtrate chambers are evacuated to increase the throughput of the decker and improve and accelerate drainage. The filtrate chambers are for this purpose divided by radial and axial transverse partitions into individual filtrate-chamber sections distributed along the circumference and sealed off from one another. When the screen disks and hence the filtrate-chamber sections rotate and the sections enter into flow engagement with filtrate outlets at the bottom of the decker, they are simultaneously evacuated, accelerating drainage through the disks. The results are a higher throughput, a lower material density in the filtrate, and lower specific investment costs at the same throughput or material density in the filtrate.