Abstract: A two-stage filter apparatus for removing particles entrained in a liquid wherein the liquid is initially presented to the first filter stage having an endless filter belt for removal of a portion of the entrained particles to result in a liquid having a decreased density of particles. This resulting liquid of decreased density is then presented to a cyclone filter in the second filter stage and divided into two parts, one part which is substantially free of any particles which is then available for its intended use and a second part that is presented to another endless filter belt and returned serially to the first filter and then the second filter stages for subsequent filtering of particles.

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: Filter chambers composed of two adjacent filter disks are attached to a drum-like filtrate collection chamber and are adapted to rotate therewith. The filtrate penetrates the filter disks and enters the collection chamber and thereafter exits the collection chamber through a collection space. The collection space is sealed from the trough by means of a rotating seal. The suspension inlet is provided on a sidewall of the trough and the suspension outlet is provided on the opposite wall of the trough. The disk concentrator serves to remove filtrate from aqueous suspensions containing fibrous components.

Abstract: A pre-filtering apparatus for pre-filtering raw material to be pressed by a continuous screw press having a hopper includes a filtering screen arranged rotatably within the hopper about a shaft, so that the inside space of the hopper is divided into two portions. The raw material is supplied into the one of the two portions which communicates with the continuous screw press. Water, oils and fats extracted by the screen from the raw material are discharged out of the hopper through an outlet pipe provided to the hopper at a position above the shaft.

Abstract: The invention relates to a method of manufacturing plastic, electrically conductive pressure-formed plates from thermoplastic plastic particles which are mechanically formed. In this method, mechanically formed, thermoplastic particles, each particle having maximum particle diameter in the range of about 1 mm to about 10 mm in the middle of the particle, are mechanically mixed with an amount of at least one electric-current-conducting substance sufficient to provide electrical conductivity. The electric-current-conducting substance is furnished in the form of a plurality of particulate, electrically conducting solid bodies, said mixing being effected in the temperature region below the glass temperature (Tg) of the thermoplastic plastic material of which the thermoplastic particles are comprised. The mixture thus produced is compressed to form plastic pressure-formed plates by means of a pressure-forming device.

Abstract: A diatomaceous earth caking filter element includes a first elongated tubular manifold having a slot therein and a suction coupling formed thereon for drawing a liquid from said first manifold. A second elongated tubular manifold has a slot therein and a plurality of hollow pipes connected between the first and second manifolds with one end of each pipe extending into the first manifold through the slot therein and the other end of each pipe extending into the second manifold through the slot therein. Each pipe is held by the slot edges of each manifold extending into an annular groove on each end of each pipe. A filter cake screen covers both sides of the plurality of hollow pipes for catching a filtering medium, such as diatomaceous earth, thereon for filtering liquid passing therethrough, so the liquid can be drawn through the filter medium and filter screen into the first and second manifolds and out the suction coupling.

Abstract: A continuous separation apparatus having a plurality of separation chambers in a continuously rotating block between fixed end plates. The axis of the chambers, preferably cylinders, is parallel to the axis of rotation of the block, wherein the end plates are provided with stationary inlet and discharge ports which overlap openings in the cylinders as the cylinders rotate so that cylinders are constantly being filled by forcing a free-floating piston to one end of the cylinder, cylinder contents are separated by hydraulically forcing the piston toward the fill end of the cylinder where the liquid is removed through screen means at the fill end of the cylinder and solid contents evacuated through an end plate port. The cylinder block continues rotation to permit a constant flow into the apparatus, a continuous removal of separated fluid and a constant separated solids flow from the apparatus.

Abstract: A water filter formed of an upright closed vessel having water inlet and outlet openings adjacent the top thereof, an outlet pipe extending within the vessel from the water outlet opening to adjacent the vessel interior bottom, a permeable barrier filter positioned within the vessel adjacent the interior bottom and affixed to the lower end of the outlet pipe, the vessel being filled with a particulate filter medium, preferably charcoal or the equivalent, the filter medium surrounding the barrier filter, and the barrier filter being formed by a short length tubular wall of impervious material having an opening in the tubular wall, a filter inlet pipe received in the opening in the tubular wall and extending within the housing, the end of the filter inlet pipe within the housing being closed and the pipe having a plurality of small openings therein, two semi-circular permeable foam plastic filter members within the interior of the housing, the semi-circular filter members being the thickness substantially that

Abstract: A tank filter having a drag conveyor circulating through the tank interior, the conveyor having flights frictionally engaging a disposable filter media belt to advance the same through the tank during indexing cycles, the belt unconnected to the conveyor to readily separate from the conveyor after passing out of the tank. A distributed bias force generating arrangement is employed to establish a sufficient frictional engagement of the conveyor flights to reliably drive the filter media belt, the arrangement comprised of a pair of spring loaded bars acting on the conveyor to urge the conveyor flights into frictional engagement with the filter media belt, allowing the use of a more steeply inclined exit end wall for a more compact tank structure.

Abstract: A method of treating a liquid, for example dewatering a sludge by ultrafiltration, in which the liquid is caused to flow repeatedly along a permeable walled tube (22) so that a filtrate passes through the wall of the tube, the progress of the treatment being monitored by monitoring the pressure difference between the ends of the tube (22). The method has enabled sludges of widely varying compositions to be dewatered to produce products of uniform viscosity, suitable for subsequent immobilization by cementation.

Abstract: An improved filter system is disclosed for filtering a liquid media such as molten metal, e.g., molten aluminum and aluminum base alloys, the system comprises a housing containing a first chamber into which molten metal to be filtered passes, a second chamber in the housing, a filter cloth that separates the first chamber from the second chamber, a high specific flow static filter in the second chamber, and means for moving the filter cloth in the housing to expose fresh surfaces of filter cloth to the metal being filtered to inhibit clogging of the filter cloth means by buildup of the filter cake and maintaining a constant high level of filtration efficiency.

Abstract: A centrifuge for the removal of solids from liquids, for example, the removal of solid fission products from dissolved nuclear fuel. The centrifuge is mounted behind a solid wall and is provided with a pivotable catch tray which cooperates with a feed inlet extending through the wall of a casing about the bowl of the centrifuge. The catch tray is pivotable between a first position at which it cooperates with the feed inlet to introduce feed liquid into the bowl and a second position at which it is removed out of cooperation with the feed inlet to permit withdrawal of the bowl from the casing through a removable plug in the wall.

Abstract: A method for filtering liquid or gaseous materials where the filtration is conducted with a porous filter media prepared from an aqueous wet-laid, lofted fiber-reinforced composite sheet, the composite sheet comprising a heat fusible polymer, reinforcing fibers and a binder. The random fiber composite sheet can be selectively lofted or recompressed to form filter media having variable porosity. Also, a membrane support means prepared by applying or treating the fiber-reinforced composite sheet with a discriminating membrane layer.

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 replaceable water filter unit which can be used with a water pitcher, water bottle, or other such water dispensing device utilizes activated charcoal particles which are sandwiched between a pair of pads which may be fabricated of polyester felt batting material. The pads and charcoal particles sandwiched therebetween are installed in a frusto-conical housing with the pads in tight abutment against the side walls of the housing. The opposite end walls of the housing are apertured and each of the pads is installed directly opposite one of these end wall portions. The housing is removably installed in the outlet portion of the water dispensing device such that the water passes through the pads and the charcoal particles when being dispensed.

Abstract: A vacuum filter having a filter tank provided with a lower vacuum chamber covered with a filter medium and connected to the intake of a pump. The filter medium, either a paper web or a fibrous filter aid, is removed when contaminated by a chain and flight conveyor after the vacuum is relieved. The vacuum is relieved by a single power actuated valve operable to supply clean liquid to the pump from a clean liquid tank and to supply a limited amount of liquid to the vacuum chamber.

Abstract: The invention relates to an improved process and apparatus to produce a filter cake formed by retained solids collected on a filter cloth during filtering. Accordingly, the filter cake is sub-divided into a plurality of filter cake elements which are kept separate from each other at predetermined distances. Further, impermeable zones on the filter cloth are formed around the filter cake elements. The filter cake elements and the impermeable zones are of a size that the filter cake elements can freely contract in any plane without cracking, while the filter cloth between the filter cake elements is covered by the impermeable zones.

Abstract: To wash and dewater solid-water mixtures in the preparation of construction materials, particularly in recycling processes (processes using recycled waste materials), a sturdy washing trough structure is formed of a sheet steel washing trough to which a vibration box (also solid) is connected on the solids discharge side in order to achieve improved dewatering, and to provide at least one "washing pulsator" and at least one "conveying pulsator", in the form of hydraulic or pneumatic organs, which engage the washing box itself. In addition, with the aid of a hydraulic or pneumatic thrust organ, the entire assembly can be swung up around a swing pivot, said swinging up being toward the solids discharge location; and/or said assembly can be swung up toward the washing water overflow.

Abstract: Apparatus for continuously filtering a flow of melted plastic which includes means for purging the filter without interrupting continuous operation. A filter assembly consists of a trap plate and breaker plate between which filters are disposed. The trap and breaker plates each defines triangularly shaped openings diposed in a circular array, each of which is subdivided into smaller passages for filtering larger contaminants. Individual filters also of triangular configuration are sandwiched between registering openings between the trap and breaker plates, each filter consisting of a fine and coarse screen. A collector head is rotatably disposed for selective registration with each of the openings of the trap plate, and an indexing mechanism is included for stepping the collector head for stationary registration with each opening. The collector head communicates with a contaminant discharge passage that is open and closed in timed sequence with movement of the collector head.

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.