Abstract: A filter device for use in a domestic or office water supply system is provided. The device includes a container having an enclosed cavity, and includes a filter unit disposed in the cavity. The device is a two-stage device having a first radial flow filter subassembly and a second axial flow filter subassembly. The radial flow subassembly includes a radially inner perforated tube, a carbon block cylinder over the tube, prefilter cylinders over the carbon block cylinder, and a screen-like wrap layer over the radially outer second prefilter cylinder. The axial flow subassembly has a plurality of axial filter fiber tubes which have a support header wall. The header wall is mounted in a cup-shaped member. The cup-shaped member has a plurality of outlet passage slots at the closed end thereof and supports the header wall at the other end thereof.

Abstract: A chamber having side walls, a bottom wall and a top wall having an aperture includes a fluid inlet aperture and a fluid outlet aperture. The chamber includes a bottom baffle disposed within the chamber and adjacent to the bottom wall for dividing the chamber into first and second areas. The bottom baffle includes an aperture for providing a fluid communication path between the chamber first and second areas. A side baffle is disposed within the chamber and adjacent to the side wall containing the fluid outlet aperture. The baffle is disposed generally perpendicular to the bottom baffle for creating a fluid communication path from the chamber second area to the chamber fluid outlet aperture for discharging liquid free of particles of foreign matter from the chamber.

Abstract: A filter cartridge with a filter element inserted in a receiving space formed by a central cylindrical flow pipe 32 and a peripheral wall 34 is in terms of its possibilities of use and possibilities of adaptation to filtration problems substantially improved in that the filter element consists of fleece-like filter material and in that in its radial direction it comprises mutually enclosing zones of different filtering properties. For practical purposes, these zones can follow one another without any transition or they may be constructed with filtering properties which are varied in stepwise fashion. The filter element can be formed by the combination of a pleated filter fleece with a rolled-up filter fleece, the pleated part of the filter element being optionally on the inside or the outside.

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 liquid fuel dispensing system with improved means of preventing water and particulate contamination employing an underground fuel storage tank, a pump for moving fuel from the fuel storage tank to a pump fuel outlet, an underground enclosed sump in which at least a portion of the pump is located, a filtration vessel within the sump having a fuel inlet connected to the pump fuel outlet and a fuel outlet, a filter element in the filtration vessel in series with fuel flow therethrough, the filter element having a filter media which intercepts particulate contaminants and which absorbs water to thereby prevent particulate and water contaminants from passing therethrough, a fuel shut-off device in conjunction with the filter element which is moved to the closed position when a predetermined pressure differential develops across the filter media as water is absorbed, the shut-off device serving to, upon actuation, completely block the flow of fuel through the filter element.

Abstract: A coffee filter is provided that has tabs for easy removal of filter. There is defined in one side of the filter channels where the tabs are provided. The tabs are arranged and located in the upper portion of the filters, and wherein after the tabs are formed, slotted portions are provided in the filters. Extended tabs may also be used in one form of the filters.

Abstract: A high-strength disposable tube filter and associated mounting and fluid distribution head assembly with improved fatigue life and higher operating pressure capability. The tubular style filter housing being of a unitary construction utilizes metal tubing rather than the commonly used deep-drawn thin gauge malleable metal can having the closed end of the internal filtering element being the closed structural endcap, or cover, of the housing can. The specification discloses a new state of the art unitary construction method whereas major improvements over prior art will benefit the industry.

Abstract: A horizontal counter-top water filter adapted to reside behind a sink faucet fixture. The water filter has a horizontal housing defining a fluid inlet chamber and a fluid filtration chamber, an inlet end cap which is configured to conduct an incoming fluid flow from the fluid inlet chamber to the fluid filtration chamber and an outlet end cap configured to receive a filtered fluid flow from the fluid filtration chamber to a fluid outlet spigot. The water filter is additionally fitted with a diverter valve and fluid conduit, which conducts diverted fluid from a sink faucet into the water filter.

Abstract: A high-strength spin-on tube filter with improved fatigue life and higher operating pressure capability. The tubular style filter housing being of a unitary construction utilizes metal tubing rather than the commonly used deep-drawn thin gauge malleable metal can having the closed end of the internal filter element being the closed structural metal endcap, or cover, of the housing can. The specification discloses a new state of the art unitary construction method having several major improvements over prior art that will be of a benefit to the industry.

Abstract: An assembly is provided of a filter bowl (10), a cartridge (12) and a head (11) in which the filter bowl (10) can be removed after it has descended from the filter head (11) through a distance corresponding to only a minor part of the length of the filter cartridge (12). The cartridge (12) is a push fit into a vertical port (52) in the filter head (11). Flange (18) of the cartridge (12) and a slotted buttress (44) of the bowl (12) establish a mechanical connection between the filter bowl (10) and the cartridge (12) so that the filter bowl (10) and the filter cartridge (12) are together mounted to and demountable from the filter head (11). The filter cartridge (12) having the support flange (18) that coacts with the buttress (44).

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: A water filter cartridge has a cylindrical shell. A conduit runs between closing end walls and is disposed within a filtration material. There are additional openings in the respective end walls for communicating the flow of water through the material. A water filtration element of a porous medium is shaped to nest within a portion of the shell encircling a corresponding portion of the filtration material and defining space between the medium and the inner side wall of the shell with that space being in the water flow path from one of the end walls and the material through the medium. A reference color is exhibited over a portion of the exterior side wall of the shell adjacent to the location of the medium inside the shell, and the medium exhibits a given color upon beginning of usage but changes color with continued usage in response to its entrapment of matter in the water. The shell is transparent over the medium to enable the user to compare the medium color to the reference color.

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: A method for making a low pressure cartridge for liquid filtration, particularly of minerals from drinking water, comprises locating a pair of substantially identical end cap members telescopically on opposing ends of a tubular member. The end cap members are coupled to the tubular member mechanically by interference between four circumferential rings raised from an inner surface of each of the end caps and like numbers of circumferential grooves on a facing surface of the tubular member. O-rings between the telescoped members provide further fluid sealing and increased mechanical coupling, if desired. Different axial spacing between different adjoining pairs of rings assure axial alignment of the end caps with the tubular member during 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: The invention is directed to a liquid strainer and a blank for forming the strainer. The strainer has a conical shape with an apex portion completely surrounded by a filtering cloth and folded from the blank to exclude any unfiltered passageway. The blank has the general shape of a disk truncated about two angularly spaced radial sides, the angle between the sides allowing for formation of a conical shape when the sides overlap. A circular aperture is partly carved at the intersection of the two sides, the remaining portion of the aperture is surrounded by a ring extending from the sides. The aperture is covered by a filtering cloth peripherally adhering to the blank and the ring. When the blank is folded, the ring forms and continuously extends from the latter. The filtering cloth which is glued to the ring completely closes any passageway through the folded cloth.

Abstract: The invention is a filter including a housing within which are positioned annular, concentrically mounted filter elements that are folded in opposite helical pleats so that the inside pleats of the outer filter element touch the outer pleats of the inner filter element in a crisscross fashion. Being positioned in this manner, the filter elements support each other and form channels between them through which filtered material passes before exiting the filter. The invention also including a housing within which is positioned pairs of annular filter elements consecutively numbered with capped ends for selective fluid passage between the inner surface of the odd elements and the outer surface of the even elements.

Abstract: A high pressure spin-on filter is provided having a generally cylindrical filter housing with an open end and a closed end. A generally cylindrical filter element having a closed end and an open end is disposed within the housing. A multifunctional rigid cover is disposed in the open end of the housing and includes a circular rim member extending into the housing. The rim member has an axial bore extending through the rim member and defines an inner surface. The inner surface is partially threaded and further has a groove formed in the inner surface. A main seal is located in the groove of the rim member. The rigid cover further includes a circular hub member having an axial bore through the hub member concentric with the axial bore of the rim member. A plurality of ribs interconnect the rib member to the hub member and cooperate with the rib member and the hub member to define a plurality of openings between the rib member and the hub member.

Abstract: Compound filters using two different filter element types are disclosed. When a carbon element is used it is of the concentric type having a central cavity. Filter elements for filtering very fine particles are used in addition. Various types of such elements, including hollow fiber elements, are disposed in a lower portion and/or upper portion. Flow control arrangements, improved filter element removal arrangements, improved filter sealing arrangements, accommodations for filter elements having different lengths and tolerances and filter arrangements for preventing liquid flow when no filter element is present are described.

Abstract: To simplify the assembly of filter modules 10, the supporting tube 1 which carries the filter cells 9 is constituted in two pieces. Both the upper tube piece 4 and the lower tube piece 5 contain locking elements 7 which are received in correspondingly large recesses 8, thereby making possible a safe interlock as well as a relative axial movability of the tube pieces 4 and 5.