Abstract: A filter element has a pleated filter mat (3). The terminal axial ends (7, 8) of the mat are connected to end caps (9, 11). The mat has a main structural layer (15) having filtering properties and a first additional structural layer and a second additional structural layer (17,19). The surface area of each of the additional structural layers (17, 19) is smaller than the surface area of the main structural layer (15). The axial ends (12, 14) of one additional structural layer (17) is located at an axial distance from the axial ends (16, 18) of the other additional structural layer (19) on the filter mat (3).

Abstract: A method for degassing flowable fluids, in particular liquids used for hydrogen storage, uses a device including a desorber (12) that can be filled with fluid to be degassed and through which the fluid can flow. A circulation pump (48) circulates the fluid during a degassing process in the desorber (12). A vacuum pump (38) generates a vacuum in the desorber (12) during a filling step with fluid and for discharging the gas from the desorber (12) during the degassing step. At least one sensor (44a, 44b) measures the pressure in the desorber (12) and/or a dwell time. A control unit ends the degassing process when a predefined pressure is measured by the sensor (44a, 44b) and/or when a predefined dwell time of the fluid in the desorber (12) is measured.

Abstract: A filter assembly, in particular used as a portable service unit for hydraulic applications, has a motor-pump unit (8) with one outlet (14) connected to a filter element (18) in the main flow. Another other outlet (26) of the motor-pump unit is connected to a device for measuring particles in the fluid in a bypass flow having a particle sensor (36). As a component of the device for measuring particles, a fluid line (38) of predeterminable length as a stilling section is on the inflow side of the particle sensor (36) in such a way that gases carried along in the fluid re-dissolve in the fluid. The fluid line (38) of predeterminable length is accommodated in a housing part (52) of the assembly, combined to form at least one winding.

Abstract: A filter element (3) is designed as a replacement element and has filter medium (59) formed as a hollow body and extending between two closure parts in the form of end caps (13, 19). The filter medium is pleated with individual filter folds (66), and includes a filter material (61) made of cellulose.

Abstract: A filter element for fluids, in particular for hydraulic fluid, has a foldable filter casing (10) with at least one filter layer (18, 20, 22, 24) extending between two end caps (26, 32). To vary in regions the thickness of the filter casing (10), the height (h1) of each filter fold (12, 44) increases from one end cap (26) to the other end cap (32). Alternatively, with the filter fold height (h1) being maintained, the outer diameter (40) of the filter casing (10) varies in the direction of one of the end caps (26, 32).

Abstract: An apparatus (10) for dewatering fluids includes a dewatering chamber (12) through which the fluid for dewatering, especially by a gas that dries the fluid, can flow via an inlet (30) from a fluid reservoir (80) to a fluid input (16) of the dewatering chamber (12) and an outlet (32) from a fluid output (20) of the dewatering chamber (12) to the fluid reservoir (80). A common line (34) is assigned alternately to the inlet (30) and the outlet (32). A fluid pump (36) is disposed within the common line (34). A control valve (40) connects the common line (34) to the fluid reservoir (80) in a first position and to the fluid output (20) of the dewatering chamber (12) in a second position. A flow divider (82) disposed at the opposite end of the common line (34) from the control valve (40) divides the fluid stream coming from the fluid pump (36) into a first substream (t1) that leads to the fluid input (16) of the dewatering chamber (12) and a second substream (t2) that leads to the fluid reservoir (80).

Abstract: A device removes moisture from a hydraulic medium (2) with at least one gaseous drying medium (3). The drying medium (3) is air and/or some other working gas with a moisture absorption capability. The drying medium is conducted by a delivery device (4) from an area surrounding the hydraulic medium (2) to the hydraulic medium (2) when the moisture content of the gaseous drying medium (3) is lower than the degree of water saturation of the hydraulic medium (2).

Abstract: A method for detecting particles in a fluid stream includes generating a measurement field that can be passed through by the fluid stream, acquiring and evaluating measurement values of the fluid stream passing through the measurement field, and detecting at least one particle by way of a distinctive sequence of measurement values. Each of the distinctive successions of measurement values is acquired and evaluated to determine if a particle or a gas bubble is passing through the measurement field.

Abstract: The invention concerns a method of operating a particle sensor and evaluation of a result. A method of operating a particle sensor and evaluation of the results thereof comprises at least the following method steps: determining the frequency of the particle occurrences by means of the particle sensor; and signalling the exceeding of a predefinable threshold value, determined from the maximum particle number detected per time interval.

Abstract: A filter apparatus (10) for cleaning functional fluids, especially selected from phosphate esters, phosphate ester-based oils, mineral oils and phenols, includes a filter housing (12) into which a filter bed (14) has been introduced. The filter bed has a mixture of anionic and cationic ion exchange resins. At least one filter element (16), designed as a flow guide device, enables the diversion of the fluid from a radial to an axial flow direction (18) or vice versa.

Abstract: A method and a device detects contaminants in a fluid (1). Fluid (2) with particles is conveyed by a first metering pump (3) to a device (4) for measuring the contamination or the particle density in the contaminated fluid (2). Before entering the device (4) for measuring the contamination, the fluid is mixed with cleaned fluid (5) in a defined mixing ratio. The particle density or the contamination of the mixed fluid (6) is measured. The particle density or the contamination of the contaminated fluid (2) is determined by an arithmetic unit (7).

Abstract: The invention relates to a method and a device for detecting contaminants in a fluid (1), wherein the fluid (2) that is contaminated with particles is conveyed by a first metering pump (3) to a device (4) for measuring the contamination or the particle density in the contaminated fluid (2). Said method and said device are each characterized in that, before entering the device (4) for measuring the contamination, the fluid is mixed with purified fluid (5) in a defined mixing ratio, the particle density or the contamination of the mixed fluid (6) is measured, and the particle density or the contamination of the contaminated fluid (2) is determined by an arithmetic unit (7).