Abstract: A multiple-plate filter apparatus characterized by a plurality of individual filter units, each having dual filtering surfaces. The filtering surfaces are defined in part by bags made of plastic cloth. During the cleaning cycle, a flotation collar raises the filter unit assembly to the top of the tank so that the individual units can be retrieved without reaching into the solution.

Abstract: Phase separation in a solvent (liquid-liquid) extraction process is effected in a settling tank by passage through one or more coalescer units. The mixed liquid phases to be separated are introduced at a main supply position from which flow is radially outwardly into the settling tank. A polygonal settling tank is described having removable segments arranged around a mixer tank.

Abstract: A disc filter assembly in which a plurality of filter discs are attached to a central shaft. The central shaft is a fabrication which has a central mandrel. Pipe segments are removably secured around the mandrel with their longitudinal axes parallel to the mandrel's longitudinal axis. The pipe segments have walls which define a trapezoid in cross-section. The walls are positioned such that two side walls define planes which converge relatively close to the longitudinal axis of the mandrel. Each pipe has at least one aperture through which filtrate from the interior of the disc filter segment passes to the interior of the pipe. The pipe is in fluid communication with an end piece having apertures therethrough. The end piece apertures have a trapezoidal cross-section corresponding to the trapezoidal shape of the pipe interior. A wear plate is attached to the outer end of the end piece and has trapezoidal apertures therethrough which are aligned with the apertures of the end piece.

Abstract: A vacuum separator which includes an air pressure source, at least a pair of filter discs, each of the filter discs including a plurality of filter sectors, and means for alternately connecting the air pressure source first to one of the filter sectors of one of the filter discs and subsequently to one of the filter sectors of the other of the filter discs.

Abstract: The self-cleaning filter for purifying a liquid from suspended particles has a housing with pipes for the inlet of the liquid to be purified and for the outlet of the clarified liquid, accomodating at least one filtering partition dividing the internal space of the housing into chambers for the liquid to be purified and for the clarified liquid, and means for flushing this partition with a countercurrent of the clarified liquid. The inlet pipe for the liquid to be purified is arranged on the housing within the chamber for the clarified liquid so that its geometric axis is substantially parallel with the plane of the filtering partition and communicates with another pipe received in the chamber for the clarified liquid so that its geometric axis extends centrally of this chamber, substantially perpendicular to the plane of the filtering partition, the latter having made therein an opening the edges whereof are connected to said another pipe.

Abstract: A sector assembly for disc filters including an improved sector body, an improved bell member and two sector rods which extend along respective radial sides of the sector body and of the bell member to secure the sector body to the bell member. Each radial side of the sector body being formed to define a concave channel and formed to define within the channel a concave slot. Each radial side of the bell member being formed to define a concave channel and formed to define a passage inward of the channel. The slots and passages being dimensioned to allow the respective sector rod to extend therein.

Abstract: A rotary disc vacuum filter includes detachably-mounted conduits rotating with a trunnion to provide flow communication between disc-shaped filter elements mounted on the trunnion and a valve applying suction to the filter elements. The rotary disc vacuum filter further includes ferrules for mounting the disc-shaped filter elements to the trunnion.

Abstract: A filter cartridge assembly is formed of a series of stacked disc members interlocking with one another and held in compression by a preload force exerted through respective end members at opposite ends of the assembly. Each of the disc members is provided with a series of raised surfaces -- bosses, for positioning filter media thereon and providing fluid flow paths for the filtrate to pass through openings in the disc members into a central passage and out of the cartridge. Cooperating raised edge surfaces adjacent to the outer and inner periphery, engage and seal the filter media under a compressive load along the surfaces adjacent the outer and inner edges of the media, when the respective disc members are in stacked relationship and the media is sandwiched between neighboring discs.

Abstract: Apparatus for separating particulate matter from a flowing fluid which, for example, may be sand entrained in a flowing stream of oil and gas, comprises an assembly including a plurality of small diameter tubular elements, the walls of which have a selected permeability to said fluid. The tubular elements are held with their axes parallel between a pair of headers by suitable tension means. The interior of the tubes are connected to at least one plenum and to a well tubing. When this assembly is inserted into a well producing oil and gas which carries sand, the sand will be deposited against the outer walls of the tubular elements since the grain diameters are greater than the size of the openings in the walls of the tubular elements. The fluid flows through the openings in the wall of the tubular element, into the plenum and then through the well tubing to the surface of the well. By using suitable headers at each end, a plurality of these assemblies can be connected in series.

Abstract: A rotary filter for concentrating fiber suspensions comprises annular disks mounted in parallel and spaced from each other on a motor-driven drum having a lattice-shaped cylindrical wall, the drum being journalled in a vessel for liquid to be filtrated. Each filter disk is composed of sector-shaped filter boxes having at least two opposite filter walls and connected to outlet conduits included in the lattice-shaped wall of the drum. Further, a collecting hopper is stationary inserted in the drum to collect concentrated pulp falling down through the lattice-shaped drum wall from the filter surfaces at the moment such surfaces are in their uppermost positions.

Abstract: Filtration apparatus comprising at least one microporous member having at least a pair of opposed surfaces and a predetermined thickness, a tubular member positioned with respect to at least one of said opposed surfaces whereby fluid passing through said microporous member is filtered and the filtrate is received by said tubular member for distribution and/or collection.

Abstract: A filter which includes a container-shaped housing having a top wall with multiple openings therein. A filter element is fitted into each housing top wall opening. A cover having an offset portion spans the housing top wall with the offset portion thereof being located spacedly above each of the filter elements. The filter housing includes a liquid outlet. A liquid inlet is provided which directs liquid into the space under the offset portion of the cover. The liquid then passes downwardly through the filter elements, into the interior of the housing, and out the liquid outlet in the housing.

Abstract: A hollow upright shaft is surrounded at axially spaced locations by spacer rings. Intermediate these rings the shaft is surrounded by substantially horizontally oriented plate-shaped filter elements which rotate with the shaft. Each filter element has a liquid-impermeable annular plate the upper surface of which carries a filter material. The inner circumference of the plate is formed with a downwardly extending stepped collar which is received in the subjacent spacer ring and thus centers the filter element with reference to the ring and to the shaft. The latter has openings in its periphery through which filtered liquid can flow into the interior of the shaft, to be led away.

Abstract: An apparatus for concentration of or liquid treatment of liquid-containing substance mixtures, particularly cellulose pulp, in which a preferably upright container is adapted for axial flow of cellulose pulp therethrough. A plurality of screen bodies which have outlets and are mounted in the container and have perforated or slotted walls for the collection of liquid separated from the cellulose pulp are provided. The screen bodies are arranged substantially radially in the cross-section of the container and extend from the periphery of the container to a filling body or the like provided in the container preferably centrally therein.

Abstract: A filter, especially for swimming pools, comprises a group of superposed filter beds operating in parallel within a single outer casing. By this means, the capacity of the filter for the floor area used is greatly increased, and also the strength requirement for the outer housing is not greatly increased. The beds may be in open topped containers resting upon each other.

Abstract: In a filter apparatus of the type having a receptacle and an upright hollow shaft which is rotatable in the receptacle, a plurality of substantially horizontal filter elements are mounted on the shaft axially spaced thereon and rotatable with the shaft. Each of the filter elements includes a plate member which is imperforate and a filter cloth which overlies an upwardly facing side of the plate member. Spacers are located between each pair of adjacent filter elements, and each spacer includes a ring portion which surrounds the shaft and spaces the adjacent filter elements from one another, and a plurality of spoke portions which extend outwardly from the ring portion and of which each has an upper edge engaging a downwardly facing side of the plate member of the upper filter element of the pair, and a lower edge engaging the filter cloth on the lower filter element of the pair, in order to hold the filter cloth against the associated plate member.

Abstract: This invention relates to a self-cleaning filter formed of an assembly of filtering elements fed in parallel, a rotary distributor enabling the feed of a series of filtration chambers to be cut off, wherein the distributor is driven by a hydraulic motor functioning under the pressure of the liquid filtered or to be filtered.

Abstract: A filter unit for wet and dry filtration comprising a hollow shaft provided with ribs in parallel position with respect to the longitudinal axis of the said shaft, filter discs covered by a filtering material, said discs being stacked over and enclosing the shaft in positive connection therewith, the lower surfaces of the said filter discs having radial elevations the height of which corresponds to the distance between two adjacent discs, spacer rings provided with cams arranged between each filter disc and the respective filtering material, the said spacer rings enclosing the hollow shaft and the free cross sectional area between the cams of the said spacer rings diminishing from one disc to the other.