Abstract: A device for the suction filtration of fluids, such as urea solutions for exhaust gas after-treatment systems, has a tank (2) storing the fluid, and a filter element (34) arranged in the tank and provided with a filter medium (32) separating the tank contents from a clean-side inner filter cavity (20). The filter cavity extends from the bottom (10) of the tank (2) to a filling level height (28) and corresponds to a part of the filling volume of the tank (2). On the filter cavity (20), a suction connection (22) discharges the cleaned fluid by a suction pressure corresponding to a system operating pressure. The filter element (34) is provided with a filter medium (32), which is air-impermeable if suction pressures are within the range of a low system operating pressure.

Abstract: A fluid cooling device has at least one heat exchanger device (10) for cooling at least one fluid and has at least one filter device (12) also for filtering the fluid conducted to a hydraulic device (14). The device has a follow-up suction device (42) that, if required, conducts fluid to the suction side of the hydraulic device fluid cooling (14).

Abstract: The invention relates to a device for the suction filtration of fluids, such as urea solutions for exhaust gas after-treatment systems, comprising a tank (2) storing the fluid, and a filter element (34) arranged therein provided with a filter medium (32), which separates the tank contents from a clean-side inner filter cavity (20) and extends from the bottom area (10) of the tank (2) to a filling level height (28), which corresponds to a part of the filling volume of the tank (2). On the filter cavity (20), a suction connection (22) is provided, via which the cleaned fluid can he discharged by way of a suction pressure corresponding to a system operating pressure. The invention is characterized in that the filter element (34) is provided with a filler medium (32), which is air-impermeable if suction pressures are within the range of a low system operating pressure.

Abstract: The invention relates to a method for producing a filter element (1), comprising a first filter medium (2), which has individual filter folds (4), and a second filter medium, which surrounds at least sections of the filter folds (4) in the manner of a mat-like filter jacket (6) that is composed of individual fibres (5).

Abstract: A filter device for filtering oil leakage amounts from hydraulic systems, wherein hydraulic oil can be sucked from a tank (4) via a suction line (10) and leakage oil can be fed via a leakage oil line (12) to the non-filtered side of a leakage oil filter (16). Filtered leakage oil can be fed back from the filtered side (20) of the filter to the tank (4). The invention is characterized in that a valve assembly (26) is provided, by way of which a fluid connection (22, 30) can be released between the filtered side (20) of the leakage oil filter (16) and the suction line (10) in order to reduce the leakage oil pressure in the leakage oil line (12).

Abstract: A fluid cooling device having at least one heat exchanger device (10) for cooling at least one fluid and having at least one filter device (12) for filtering the fluid which can be conducted to a constancy (14) is characterized in that the device has a follow-up auction device (42) which, if required, conducts missing fluid to the suction side of the consumer (14).

Abstract: The invention relates to a filter device for fluids, particularly hydraulic or lubricating oils, having a filter element (1) comprising at least one inflow region (5) for a fluid to be cleaned, characterized in that an adapter element (7) covering the inflow region (5) and forming a trap device for organic substances such as fatty particles and colloidal oil aging products may be attached to the filter element (1).