Abstract: In a plate filter press with filter plates (8) suspended on support guides (3, 4), which filter plates are guided along stop rails (23, 24) for the purpose of preventing pendulating oscillations, the oscillation protection is to be constructed so that a required filter plate replacement or filter cloth exchange can be carried out without disassembly of the oscillation protection.For this purpose, the provision is made that the stop rails (23, 24) can be operatively adjusted away from the filter plates (8), and to attain this objective, the stop rails are preferably pivotable about axles (30, 31) extending in parallel to the longitudinal axis of the filter press.

Abstract: An improved filter plate of the type used with a vertical stack of other such plates to form an industrial filter of the type known as a horizontal plate filter. The improved filter plate has a generally upright side wall, and a divider plate or transverse planar plate portion secured to the side wall below the upper margin thereof. An open top trough is formed in the divider plate to receive the filtrate passing through a filter medium above the filter plate when the latter forms a part of a horizontal plate filter. A hole in the side wall permits the filtrate to be removed from the trough. The filter plate further includes a fluid inlet conduit and an air vent/blowdown conduit extending through the side wall into the space below the divider plate. The trough and removable conduits eliminate the need for fixed baffles for use as the fluid inlet, outlet, and blowdown means as found in a conventional filter plate.

Abstract: This invention relates to a vertical filtering device comprising a framework containing a plurality of horizontal superimposed filtering units, movable means for supporting the filtering units, the latter comprising each a movable frame with an inlet for the slurry to be filtered, a movable plate for the filtrate and an endless movable filtration band supported by two side rollers and extending between said frame and said plate, said supporting means being arranged so as to keep the filtering units stacked against each other during the filtering operation and so as to allow the parts of the filtering units to become spaced apart from each other when the filtration cakes have to be discharged.

Abstract: A molded thermoplastic filter plate (10, 50) having a peripheral rim (14, 54) which extends completely around the perimeter of and is integral with an inner web (12, 52) such that inner drainage faces (15, 53) are formed on each side of the plate (10, 50). Each side of the plate (10, 50) is divided into four triangular sectors (20, 22, 24, 26 and 60, 62, 64, 66). The boundary of each sector lies generally along a line extending from the center of the drainage face (15, 53) to a corner of the peripheral rim (14, 54), from the corner of the peripheral rim (14, 54) to an adjacent corner of the peripheral rim (14, 54), and from the adjacent corner back to the center of the drainage face (15, 53). Thus, each sector includes a corresponding side of the peripheral rim (14, 54). A plurality of drainage ribs (28, 68) are molded on the drainage face (15, 53) in each sector such that the ribs (28, 68) of a particular sector are parallel to the corresponding side of the peripheral rim (14, 54) in that particular sector.

Abstract: The invention provides a filter plate of increased size which includes a reinforcing bar which subdivides the inner face of the plate into distinct drainage areas. The drainage areas are in liquid flow communication with each other via recess formed in the reinforcing bar. The plate is provided with raised spacing elements which are positioned in a special pattern to provide uniform deflection across the plate when the filter press is under pressure. The plate is further provided with a staggered, offset pattern of drainage ribs which enhances filter cloth support, increases plate strength and improves liquid flow around the spacing elements.

Abstract: In a filter plate-and-diaphragm assembly for a filter press, which assembly includes a filter plate having a depressed base and a thickened marginal region defining a circumferential sealing edge, and a pressure diaphragm disposed at each side of the plate and having a cup shape to conform to the depressed base of the plate, the, or each, diaphragm is provided with a foldable tongue extending at least over the sealing edge along one side of the plate and securing the diaphragm to at least one lateral edge face of the plate.

Abstract: An expressing plate comprises a core plate, a pair of flexible fluid-tight sheets applied to the front and back of the core plate and cylindrically connected together at the central prefilt passage bore of the core plate to define a prefilt passage throughgoing bore, an annular body fitted between the core plate throughgoing bore and cylindrical portion of the sheets, and annular body slipping-off preventing members applied to the front and back of the fitting boundary region between the annular body and the core plate to extend over both the core plate and annular body. The slipping-off preventing members are fixed to at least either the core plate or the annular body.

Abstract: The invention relates to a filter press construction of the type having a plurality of filter plates suspended from two parallel I beam carriers, the filter plates being provided with a novel supporting arm suspension which prevents undesired swinging. The supporting arms are bent to diverge on both front and back sides of the filter plates, two arms on each side of the vertical center of the plate to provide a novel suspension consisting of two leading bent arms and two lagging bent arms for each filter plate in its operating condition suspended for movement on the I beam carrier. The arms of the filter plates are provided with roller or equivalent sliding elements to facilitate shifting movement on the guiding flange surface of the parallel I beam carriers. This unique leading and lagging supporting arm construction on the I beam carrier eliminates serious swinging problems encountered with conventional filter presses using the parallel I beam carrier suspension for the filter plates.

Abstract: A filter-plate assembly for a filter press has a substantially rigid support plate against which bears a filter plate. This filter plate is integrally formed of elastically deformable material and has an annular outer frame which lies against the support plate and defines a frame plane. A generally planar and elastically deformable central panel lies in a panel plane and is displaceable relative to the frame between a normal position to one side of the frame plane and lying against the support plate and a pressing position to the other side of the frame plane. This panel is formed with an array of bosses projecting away from the support plate. An annular web has an outer periphery connected to the frame at the frame plate and an inner periphery connected to the panel at the panel plane. This web is relatively thin and elastically deformable like the central panel and has a surface area which is greater than the surface area of the projection of the web on the frame plane.

Abstract: Method and apparatus for drying waste matter such as sludge accumulated in a sewage treatment facility. The sludge is mixed with flocculating chemicals and thoroughly stirred. The mixture is then allowed to drain for a predetermined time in a porous-bottomed basin. A porous web preferably of braided wire which is movable across the basin floor carries the drained sludge to a pressing facility which squeezes the sludge between a pair of linear squeezing plates. As the web leaves the basin it is joined by a second web capturing the sludge therebetween for delivery to the pressing facility. The sludge may be air-blown in the pressing facility to achieve further dryness.The common guiding roll about which the two webs merge also serves as an end wall for the aforementioned basin.

Abstract: A filter press having a plurality of filter plates so supported between fixed and movable heads of the machine framework that the filter plates can selectively be separated from each other and compressed together to a substantially watertight closure between the fixed and movable heads. A filter medium is provided for each filter plate and is composed of a pair of filter webs covering respectively the opposed filtering surfaces of the filter plate. The filter webs are connected at their one end to a winding device and at their other end to a tensioning and winding roll assembly after having turned around a pair of juxtaposed guide rolls. Each tensioning and winding roll assembly is composed of a cylindrical roll and a biasing element for biasing the cylindrical roll in one direction with the filter webs forced to be wound therearound.

Abstract: A filter press with a novel spray washing arrangement for the filter plates which plates are shiftable on horizontal guides. The novel spray washing means comprises a carrier frame encompassing the stack of plates together with the horizontal guides and a spray pipe. The carrier frame is movable along the stack of filter plates at vertical, lateral struts. The spray pipe is equipped with spray nozzle and is guided as a unit movably up and down along the vertical struts. The spray pipe comprises two branch lines enclosing between them a filter plate that is to be spray washed. The spray nozzles of the two branch lines face each other to provide the same pressure on front and back surfaces of the filter plate.

Abstract: Disclosed is an improved filter of the type comprised of a series of stacked plate assemblies forming filter chambers adjacent to sheets of filter media between plate assemblies. The plate assemblies are constructed so that liquid can be rapidly removed from the filter chambers to prevent spillage when it becomes necessary to separate the plate assemblies and replace the filter media. Each plate assembly has an internal baffle system along one side having inlets for liquid to be filtered. The baffle system for each plate assembly deflects liquid coming into the chamber so as to prevent it from disturbing the filter cake, and it also allows substantially all of the liquid to be blown out of the chamber during a reverse flow "blow-down" procedure prior to separation of the plate assemblies.

Abstract: A filter plate having a plate frame with filtrate discharge means covered by filter cloth adjacent the bottom of a filter cake chamber defined by recesses in the plate. A cam projects from the bottom of the filter cake chamber and is adapted to support the filter plate on a corresponding cam on an adjacent filter plate with the cam extending substantially to the level of the outer surface of the frame of the filter plate. An opening is provided in the filter cloth covering the plate frame for receiving the cam. A clamping ring surrounds the cam and the filter cloth adjacent thereto to form a seal therebetween. A washer-like member overlies the cam and a portion of the clamping ring and retains the clamping ring in place.

Abstract: A filter press plate for layer and settling filters having an open frame of stainless steel and at least one partition plate of corrosion resistance material detachably supported within the frame by means of cooperating lugs and recesses on the mutually facing edges of the at least one partition plate and frame, sufficient clearance space being provided between the peripheral edge of the at least one partition plate and the adjacent frame edges as to accommodate any difference in the heat expansions thereof at the maximum temperature to which the filter press plate is to be exposed. The frame includes exteriorly projecting hollow eyes which define manifolds for supplying and removing the liquid to be filtered when a plurality of the elements are stacked together in use. The at least one partition plate is profiled on its opposite side faces to form channels for the liquid being filtered.

Abstract: A filter press has a support frame; a plurality of face-to-face oriented filter plates movable towards and away from one another and forming a filter plate stack; a closing device connected to the filter plates for exerting thereon a pressure with which the filter plates are urged to one another; a closing pressure regulator coupled to the closing device; a stationarily supported path-sensing signal transmitter connected to the closing device; and a sensor arm connected at least indirectly to one of the filter plates for displacing the sensor arm by, and as a function of the motion of, that filter plate. The sensor arm is coupled to the path-sensing signal transmitter for controlling the closing pressure of the closing device by the signal transmitter as a function of the position of the sensor arm.

Abstract: A filtering unit which is used in filter presses having a plurality of filter elements, which filtering unit comprises at least two filtering layers which are connected by a seam, the latter being adapted to rest on the pertaining filter element, with the remainder of the filtering unit being adapted to hang along the sides of the pertaining filter element.

Abstract: A filter plate assembly in which a filter wall has a large number of small pyramidal projections on its opposite surfaces, a peripheral frame portion supporting the outer periphery of the filter wall and formed with a prefilt passage and a filtrate passage extending therethrough, and a filter medium supported by the peripheral frame portion and covering the opposite surfaces of the filter wall. The peripheral frame portion has a rigid frame and elastic frames sandwiching the rigid frame and joined thereto. Each of the elastic frames is provided, in its surface, with an open groove to form a prefilt inlet port through which the prefilt passage communicates with a prefilt chamber defined by the filter plate and another filter plate to be fitted therewith, whereby clogging of the prefilt inlet port is eliminated.

Abstract: A filtering apparatus comprises a plurality of plate and frame sections arranged adjacent each other in alternating sequence with a layer of filter media retained between each pair. Both plate and frame sections have peripheral members with openings which provide access to the inner space formed within the members. Peripheral conduit means on each frame section serve to distribute the liquid to be filtered in a way that does not disturb the filter media or any collected dirt on it as the liquid flows through the filter media and into the inner space of each plate member where it accumulates and passed out through an outlet conduit.

Abstract: In a filter plate-and-diaphragm assembly, the marginal sealing zone of the diaphragm has a sealing rib received in a groove of the filter plate frame. During operation, the diaphragm, with the exception of the sealing zone, is lifted off the filter plate by a pressure medium introduced in a pressure chamber bounded by the diaphragm. The rib is situated in the vicinity of that edge of the sealing zone that is remote from the pressure chamber, so that an intermediate sealing zone of considerable width is disposed between the rib and the pressure chamber.