Abstract: A filter device has a filter housing (14) with a housing pot (12), which accommodates a replaceable filter element (16) and is closed by a removable lid part (32). The element material (20) of the filter element (16) separates an unfiltrate chamber (22) from a filtrate chamber (18, 43). A measurement sensing device (108) senses pressure values from at least one of the chambers (18, 22, 43), is disposed on a lid inner side (45) of the lid part (32), is at least partially guided in the lid part, and projects into the filter housing (14). At least parts of a measurement value evaluator (78) are connected to the measurement sensing device (108) and are disposed on the opposite lid outer side (42) facing the environment.

Abstract: A filter device with a filter housing (2, 6), in which a replaceable filter element (4) is accommodated and which has a cover part (2). Element material (30) is delimited at the end by at least one end cap (32). This end cap (32) of the filter element (4) is placed on a fluid channel (58). A device (84) for transverse force support for the filter element (4) is provided between this one end cap (32) and the fluid channel (58). The device (84) for transverse force support supports the filter element (4) in relation to the fluid channel (58) engaging in the interior of the filter element (4) at least partially at the end.

Abstract: A filter device has a housing (3, 5) and a filter element (23) that can be received in the housing in a replaceable manner. The housing and filter element engage with at least two key parts (53, 56, 58) or lock parts. The lock parts (57) or key parts of the housing (3, 5) are associated with each other respectively in pairs in an engaged manner, as a coding and/or setting and/or functional structure and/or reproduction protection.

Abstract: A filter device with a removable termination part (81; 82) and a housing (3) that receives a replaceable filter element (5) having two end caps (25,47). Between the end caps, a filter material (12) extends. A positioning device (65) is arranged between the termination part (81; 82) and one end cap (47). The positioning device positions the filter element (5) within the housing (3), at least when viewed in the circumferential direction of the filter element, in interaction with at least one corresponding positioning element (71) of the end cap (47).

Abstract: A filter device with a removable termination part (81; 82) and a housing (3) that receives a replaceable filter element (5) having two end caps (25,47). Between the end caps, a filter material (12) extends. A positioning device (65) is arranged between the termination part (81; 82) and one end cap (47). The positioning device positions the filter element (5) within the housing (3), at least when viewed in the circumferential direction of the filter element, in interaction with at least one corresponding positioning element (71) of the end cap (47).

Abstract: A separating device, particularly a spiral separator (10), separates impurities, particularly in the form of solids, from a gaseous medium flow, such as air. The medium can be fed to a spiral-shaped guiding device (42) that brings about an at least partial separation of the respective impurities from the medium flow. The guiding device (42) has a plurality of spiral arms (44) that delimit radially extending flow spaces (46) and that are arranged in an adjacent manner opposite to one another such that the medium flow is guided radially outwards.

Abstract: A filter device for fluids, in particular in the form of a tank-installation return filter, includes a filter element (27) accommodated in a housing (3) having a fluid inlet (17) for supplying unfiltered fluid to an inner cavity (31) of the filter element (27). The inner cavity is surrounded by a filter medium (29) through which unfiltered fluid can flow. A flow-conducting apparatus (13, 49, 77) orients the flow of the unfiltered fluid reaching the filter medium (29) and is provided between the fluid inlet (17) and the inner cavity (31) of the filter element (27).

Abstract: A filter element has a preferably multilayer structure of a pleated filter medium (3) with a plurality of individual filter pleats (5, 7). Due to an alternating sequence of filter pleats (5) with a first pleat height (h1) and filter pleats (7) with a second pleat height (h2), more effective filter surfaces are available than with filter pleats with a uniform pleat height. Upon throughflow by a fluid to be filtered, a lower surface load for the filter medium (30 and lower passage speed of the fluid are present during filtration. A static loading of the filter medium (3) during operation of the filter is then reduced. A hydraulic circuit has such a filter element (1).

Abstract: A filter device has at least one filter element (17, 19) exchangeably received in a housing (9). The filter element has a filter medium (23) permeable to a flow of the fluid to be purified and has, on at least one end, an end cap (25) that, for the purpose of positioning of the filter element (17, 19) in a functional position, interacts with a fixing body (33) connected to a removable cover (11) of the housing (9). A bypass valve (51) is provided on the fixing body (33). On the fixing body (33), a wall part (57) in the functional position forms a dividing element in the housing separating the housing into a filter element chamber (65) and a bypass chamber (63) situated at the outflow side of the bypass valve (51). The bypass chamber has a protective filter (67) through which the fluid flowing out of the bypass valve (51) can flow.

Abstract: A filter device has a support part (39, 43) receiving a filter part (1), a sealing device (17) acting between the support part (39, 43) and the filter part (1), and a securing device (53, 57, 61) releasably connecting the support part (43) to the filter part (1). The securing device has a circumferential collar part (53) that, under the action of an energy store (61), exerts a force on the sealing device (17). That force seals the support part (39, 43) and the filter part (1) in a fluid-tight manner with respect to one another. The support part (39, 43) has, on its end region oriented toward the securing device (53, 57, 61), another circumferential collar part (39). The collar part (53) of the securing device (53, 57, 61) is guided concentrically within the collar part (39) of the support part (39, 43) provided with a sealing system (41, 72).

Abstract: A filter device, especially intended for incorporation into a fluid reservoir tank, has at least one, preferably exchangeable, filter element (18) having element material (20) through which a fluid can flow from the inside outward, viewed in radial direction, and encompassed by a support tube (36) with passage orifices. The support tube is surrounded with a fluid flow space defined by a housing wall of a housing and has a plurality of passage sites. At least some of the passage orifices in the support tube (36) of the filter element (18) have a flow-directing device (80) that impart a flow direction other than the radial flow direction to the fluid.

Abstract: A filter element has a preferably multilayer structure of a pleated filter medium (3) with a plurality of individual filter pleats (5, 7). Due to an alternating sequence of filter pleats (5) with a first pleat height (h1) and filter pleats (7) with a second pleat height (h2), more effective filter surfaces are available than with filter pleats with a uniform pleat height. Upon throughflow by a fluid to be filtered, a lower surface load for the filter medium (30 and lower passage speed of the fluid are present during filtration. A static loading of the filter medium (3) during operation of the filter is then reduced. A hydraulic circuit has such a filter element (1).

Abstract: A filter device, especially intended for incorporation into a fluid reservoir tank, having at least one, preferably exchangeable, filter element (18) having element material (20) through which a fluid can flow from the inside outward, viewed in radial direction, and which is encompassed by a support tube (36) winch has passage orifices and is surrounded, in each case with retention of a definable radial distance and with formation of a fluid flow space, by a housing wall of a housing having a plurality of passage sites, is characterized in that at least some of the passage orifices in the support tube (36) of the filter element (18) have a flow-directing device (80) which flow direction other than the radial flow direction to the fluid.

Abstract: A filter element (1) has an inner body (12) and an outer body (11). One casing body (12) has a cross section deviating from circularity. Body contact surfaces (20, 21) face one another for the contact of essentially all filter folds (18a-18f, 18I-18III) of a pleated filter web (10). The filter folds (18a-18f, 18I-18III), in terms of fold height (h), are divided into individual groups (I, II) each having several filter folds (18I-18II) of a common fold height (hmax, hmin) alongside one another in sections. Between two adjacent filter folds (18a-18f, 18I-18III) of different groups (I, II) filter folds are arranged (18b-18e; 18m) of at least one third group (III).

Abstract: The invention relates to a filter device for fluids, in particular in the form of a tank-installation return filter, comprising at least one filter element (27), which can be accommodated in a housing (3), which has a fluid inlet (17) for supplying unfiltered fluid to an inner cavity (31) of the respective filter element (27), which inner cavity is surrounded by a filter medium (29) through which unfiltered fluid can flow. The filter device is characterized in that a flow-conducting apparatus (13, 49, 77) that orients the flow of the unfiltered fluid reaching the filter medium (29) is provided between the fluid inlet (17) and the inner cavity (31) of the respective filter element (27).

Abstract: A filter element with a preferably multilayer structure of a pleated filter medium (3) with a plurality of individual filter pleats (5, 7) is characterised in that, due to an alternating sequence of filter pleats (5) with a first pleat height (h1) and filter pleats (7) with a second pleat height (h2), more effective filter surfaces are available than with filter pleats with a uniform pleat height, and therefore, upon throughflow by a fluid to be filtered, there is a lower surface load for the filter medium (3) and lower passage speed of the fluid during filtration, with the consequence that a static loading of the filter medium (3) during operation of the filter is reduced. The invention also relates to a hydraulic circuit with such a filter element (1).

Abstract: A filter element (1) has an inner body (12) and an outer body (11). One casing body (12) has a cross section deviating from circularity. Body contact surfaces (20, 21) face one another for the contact of essentially all filter folds (18a-18f, 18I-18III) of a pleated filter web (10). The filter folds (18a-18f, 18I-18III), in terms of fold height (h), are divided into individual groups (I, II) each having several filter folds (18I-18II) of a common fold height (hmax, hmin) alongside one another in sections. Between two adjacent filter folds (18a-18f, 18I-18III) of different groups (I, II) filter folds are arranged (18b-18e; 18m) of at least one third group (III).