Abstract: A filter element (1) has a filter pot (3) delimiting a cylindrical interior (5) and has a bottom part (7) with a fluid connection (11). A lid part (37) is opposite the bottom part. A filter medium (29) is adjacent to the inner wall of the filter pot (3) in the form of a hollow cylindrical body leaving the central region of the interior (5) free. Fluid passages (31) in the wall of the filter pot (3) surround the filter medium (29). A ring body (53) as a connecting part 10 between filter pot (3) and lid part (37) and has a jacket part (55) extending axially along the end section (57) of the filter pot (3). An end part (51) extends radially inward and spans the edge of the filter pot (3) and the edge of the lid part (37). On the end part (51) of the ring body (53) and on the lid part (37), interacting snap connectors (59, 61) are provided to form a snap connection between end part (51) and lid part (37).

Abstract: A filtering apparatus includes a pot-type filter housing (10), a filter element (28) accommodated in the housing, a holding mechanism (38) disposed in the filter housing (10) to removably fix the filter element along its longitudinal axis, and a sealing device (60) that seals between a lid (20) of the filter housing (10) and the filter element (28). The holding mechanism (38) is provided with cooperating holding elements embodied on the interior face of the filter housing (10) as well as on the filter element (28). The filtering apparatus dispenses with the need for O-seals that are known in prior art and extend in a radial direction between the filter element and the filter head as a housing lid because the sealing device (60) encompasses at least one sealing edge (62) or sealing surface placed parallel to the longitudinal axis in a radial direction and seals under the effect of the pressure applied it by the holding mechanism (38).

Abstract: A filter device, especially a line filter forming part of hydraulic installations, includes a filter housing (1) that can be removed from a filter head and is used to receive a filter element (5) that separates a non-filtered side (13) from a filtered side (11) in a position in the filter housing for the operation of the filter. The filter device is provided with a display device (19, 21) signaling the absence or presence of the filter element (5) in the filter housing (1) in the operating position.

Abstract: A modular unit has at least one filter (10), pump (12) and cooling unit (14) fluidically connected to each other by a connection module (16) and connected to a tank unit (18). The connection module (16) opens out inside (22) the tank unit with a suction opening (20), together with the cooling unit (14) when the tank unit is connected (18). The filter unit (10) and pump unit (12) are arranged outside the tank unit (18). The modular unit can then be placed on and connected to a tank unit. The cooling unit protrudes inside the tank unit.

Abstract: An apparatus for determining the filterability of fluids, in particular of transmission oils, has a test filter device (21) through which a sample amount of the fluid can flow, and a line system which forms a circulation circuit (1) for the fluid. The line system includes a foam tester (3) receiving the sample amount of the fluid. A circulating pump (23) removes fluid from the sample amount situated in the foam tester (3) and conveys it through the filter device (21) and back to the foam tester (3).

Abstract: A lubricating device for gear trains (10), especially for wind power stations, includes at least two gear stages (16,18) that are disposed next to each other and are effectively interconnected, and a lubricant circuit (20) into which at least one filter unit (26) is mounted. To prevent stagnant resting zones for the lubricant from being created within the gear train housing including the gear stages, while ensuring that the entire lubricant that circulates in the gear stages is fed to the filter unit to be drawn off and filtered within predefined periods of time, the lubricant circulating inside the lubricant circuit (20) is discharged at one gear stage (18), is drawn off through the filter unit, and can then be fed to the other gear stage (16).

Abstract: A filter device comprising a filter element (9), which forms a body extending along a longitudinal axis and can be received in a housing (1) that can be closed by means of a cover part (3), a sealing arrangement (49) being provided in order to form a fluid-tight seal between the housing (1) and the cover part (3), is characterized in that the sealing arrangement (49) as a component of the filter element (9) is fixed to a sealing carrier (48) rigidly connected to said element.

Abstract: A filter device includes at least one filter element (10) housed in a filter housing (22) and connected for the flow of fluid by fluid connections (30, 36) to a fluid device, in particular in the form of a hydraulic tank (40), using a connector device (44). A plunger valve arrangement is achieved, whereby the connector device (44) is provided with at least one longitudinally-displaceable blocking piece (46). In the blocking position, the blocking piece blocks the provided fluid connections (30, 36). After displacement into an open position, it releases the fluid connections. A blocking or releasing of the fluid connections in a rapid operation process is permitted to carry out a filter element exchange for the used filter medium.

Abstract: A filter element includes a filter medium (10) extending between two end caps (12, 14) that are respectively connected to an associable end region (16, 18) of the filter medium (10). The filter medium is supported at least on one side on a supporting tube (20). At least one of the end caps (14) and/or at least one end region (16, 18) of the filter medium (10) has a contacting device (22) and/or the respective end cap (14) itself or its parts are embodied in such a way as to derive the electrostatic charges, especially occurring during the operation of the filter element to ensure that the charge generated on the filter medium (Meshpack) by tribo-electrical effects can escape towards a mass point or a mass site via the contacting device (22) or the respective end cap (14).

Abstract: A device tests at least one quality parameter of a fluid in fluid apparatuses, e.g., working cylinders (10), hydraulic accumulators, valves, filter housings, pressure tubes, which at least temporarily accommodate a given fluid volume in at least one fluid chamber (12, 14). The fluid volume is stored in a storage unit (16) with the aid of a control mechanism (16) after being discharged from the fluid apparatus in order to be redirected from there into a measuring element (22, 24) to verify the respective quality parameter of the fluid. The inventive device makes it possible to specifically obtain a statement about the operability of the respective fluid apparatus within a very short period of time.

Abstract: A coupling device provides a quick-release coupling of hose-like or tubular pipes to a connecting part at an outlet for a pressurized fluid. The connecting part has a locating face against which the end face of a flange positioned at the end of the pipe can be pressed by means of clamping screws. A sealing element is held between the flange and locating face. The clamping screws are anchored in the connecting part. The locating face of the connecting part is embodied by the base of a recess surrounding the outlet. The flange, at the end of the pipe, is housed in the recess such that the edge of the recess secures the flange against radial displacement. The clamping screws directly cooperate with the face of the flange opposite the end face.

Abstract: The invention relates to a filter element comprising a filter material (10) which comprises individual filter folds (12) which are folded in a star-like manner, at least one fluid-permeable support element (26) which extends at least partially in the space between two adjacent filter folds (12) and/or on the inner peripheral side and/or external peripheral side of the filter folds (12). The invention is characterised in that the respective support element (26) is provided with filter-active substances or is made of said filter-active substances. A certain type of filter auxillary agent can be obtained which is used to reduce influences of fluid components which reduce the service life, in the form of specific ageing products or in the form of other agents which damage the fluid.

Abstract: A non-return valve includes a valve body (1) which defines an internal fluid through-opening (7) extending along the longitudinal axis (5) of the body. A seat body (17) defines a valve seat (31) arranged in the through opening (7). A closing body (35) is axially displaceable in the through opening (7) oppositely to a closing force produced by a closing spring (45) between a closed position applied to the seat body (17) and an open position lifted from the valve seat (31) on the closing body (35). The valve body (1) forms a guide along which the seat body (17) is axially displaceable in different adjusting positions corresponding to the desired preloads of the closing spring (45) and, consequently to the desired adjustments of the closing force quantity of the closing spring (45).

Abstract: A filter element includes a filter cylinder whose outer side rests against a fluid-permeable supporting tube (15). The inside (3) of the filter cylinder can be flown through by the fluid to be filtered. The filter cylinder is formed by a filter mat web. The filter mat web has a series of folds (9) that rest against one another at least in areas. Both ends of the filter mat web are joined to one another at a junction (5) to form an annular body (1). The filter element includes a device that acts upon the junction (5) to prevent, in the area of the junction (5), a bulging of the folds (9) caused by the flow of the fluid.

Abstract: A filter device includes at least one filtering element arrangeable in a filter housing (11) connectable to a hydraulic device (9), in particular a hydraulic tank. The tank is connectable to the filter housing through hydraulic connections (37, 39) by a connection system in such a way that a fluid is enabled to circulate. The filter housing is removably mounted on the hydraulic device (9) by a fixing unit. The fixing unit is embodied in the form of a bayonet fitting (17, 19) which is lockable and detachable by the filter housing (11) rotation. The connection system has at least one movable locking element which locks in the locking position the hydraulic connection (37, 39) associated with it, and releases the connection after displacement in the open position. The locking element is displaceable in a sealing or opening position by rotational motions of the housing (11) for detaching and locking the bayonet fitting (17, 19).

Abstract: A filter device has a filter housing part (10) with a filter element (12) and can be detachably connected to another filter housing part (20). A valve (24) clears a fluid path in the interconnected state of the housing parts (10, 20) with the filter element, and in the separated state of the housing parts (10, 20) from one another or without the filter element at least partially blocks it. Instead of known quarter-turn fastener and stopper solutions, a blocking is devised which can be economically implemented and which requires decidedly less installation space. A process for operation of a filter device is also provided.

Abstract: A filter element for filtering fluids has at least one filter unit (12, 14, 16) that is disposed concentrically around the axis of the element. The unit is supported on at least one supporting element (24, 26, 30) in the direction of the flow of the fluid. At least part of the supporting elements (24, 26) is provided, at least on the side facing the filter unit (12, 14, 16), with channels (28) for guiding the fluid. Longitudinal ribs (50) delimit the channels (28), and extend along the supporting element (24, 26) in the form of spiral tracks. The two free ends of each channel (28) emerge at opposite ends of the corresponding supporting element (24, 26). The channels (28) extend continuously along the supporting element, are devoid of multiple deviations in the fluid flow and only partially surround the corresponding supporting element (24, 28) to form a torsional guide for the fluid flow.

Abstract: A hydromechanical driving device generates forward-pushing movements of a band-shaped filter material according to the pressure prevailing in the fluid to be filtered to operate band filter devices. The hydromechanical driving device includes a hydraulic accumulator (29) provided with a movable element (31) separating a first storage space (33) from a second storage space (35). The side of the separating element (31) bordering the first storage space (33) is impinged upon by the pressure generated the first storage space by the fluid to be filtered. A mechanical device (17) translates a movement of the separating element (31) into a forward pushing movement. A pressure control unit (47, 49, 51) generates lower pressure in the second storage space (35) than the pressure generated by the fluid to be filtered according to the amount of pressure and/or the degree of impurity of the fluid to be filtered. The lower pressure causes the separating element to be displaced.

Abstract: A fitting for formation of a fluid-conducting connection on a container (1) of plastic, in particular a tank for receiving a fluid, specifically a hydraulic fluid, has a connection part in the form of a hollow element (5) with a jacket (21). The jacket extends along a longitudinal axis of the hollow element (5) between its ends (7, 23). The hollow element (5) is embedded in the plastic of the wall (3) of the container (1). An open end (7) of the hollow element (5) on the edge of an opening (9) in the container (1) and at least one partial area of the jacket (21) of the hollow element (5) are enclosed by the plastic of the wall (3) of the container (1).

Abstract: The invention relates to a modular unit, comprising at least one filter (10), pump (12) and cooling (14) unit which are fluidically connected to each other by means of a connection module (16) and which can be connected to a tank unit (18). By virtue of the fact that the connection module (16) opens out inside (22) the tank unit with a suction opening (20), together with the cooling unit (14) when the tank unit is connected (18) and the fact that the filter unit (10) and pump unit (12) are arranged outside the tank unit (18), it is possible to place the modular unit on a tank unit and connect it thereto. The cooling unit protrudes inside the tank unit.