Filter Fibel - MAHLE - #51

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Suction filter Suction filters are usually designed with a wide mesh (e.g. 100 µm) and are suitable for filtration ofthe hydraulic fluid that is suctioned by the pump. Partial flow filters Arrangement of the return line filter parallel to achoke so that only a portion of the returning oil flow is filtered. An ideal solution for oil flows that significantly increase in periodic intervals. Depth filter Replacement filter Filters that mainly separate contaminant particles in the interior of the filtering material. Compared to surface filters, their contaminant absorption capacity is greater and their pressure loss is less. With replacement filters or screw-on cartridges the filter element is encapsulated in a metal hous- ingand is replaced completely, along with thehousing, after use. Replacement filters arescrewed onto an appropriate filter head. Replace- ment filters are used as low-pressure filters, return line filters, or bypass filters, particularly in mobile hydraulics. Their fineness depends on filter con-cept Sm-x, Mic 10, or Mic 25. Bypass valve andnominal size correspond to those of the pressure filter, return line filter, or bypass filters. The maxi- mum possible nominal pressure is 10 or 25 bar. A contaminant indicator is generally required. Line filter Filters that are directly installed in the pipeline viathreads or flange. Multipass test Standardized test in accordance with ISO 16899for determining the separation rate of a filter in which a defined contaminated test liquid is sentmultiple times through the hydraulic circuit and through the filter to be tested. Bypass filtration Arrangement of the filter in a circuit that is sepa- rated from the main system and that is fitted with its own pump. Bypass filtration through a precisely specified filter can occur independently of theoperating time of the equipment, until the desiredcontamination class is achieved. Nominal pressure (NP) Pressure for which the filter has been designed. Nominal size (NS) Numeric volume flow for which the filter has been designed. The nominal size is based on the viscosity 32 mm
2 /s, and the filter fineness ß
20(c) ≥ 200. Surface filter Filters that separate contamination particles only on the surface of the filter element (e.g. wire mesh elements, edge gap filters). Surface filters are designed so that they have uniform pores (gaps).Compared to depth filters, surface filters have onlya low contamination absorption capacity. Return line filter Filters for installation in the return line of a device.Return line filters must be selected based on thegreatest occurring volume flow – depending on the pump output flow.
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