Abstract: A filter element has a first filter layer that has an active carbon layer, a top cover layer connected to the active carbon layer and a bottom cover layer connected to the active carbon layer opposite the top cover layer, wherein the first filter layer is folded to a first bellows. At least one second filter layer having an active carbon layer, a top cover layer connected to the active carbon layer and a bottom cover layer connected to the active carbon layer opposite the top cover layer is provided. The at least one second filter layer is folded to a second bellows. The first and second bellows are folded identically. The at least one second filter layer is arranged on the first filter layer in a positive-locking way by fold alignment of the first and second bellows to form a composite of filter layers.

Abstract: A filter element has a first filter layer that has an active carbon layer, a top cover layer connected to the active carbon layer and a bottom cover layer connected to the active carbon layer opposite the top cover layer, wherein the first filter layer is folded to a first bellows. At least one second filter layer having an active carbon layer, a top cover layer connected to the active carbon layer and a bottom cover layer connected to the active carbon layer opposite the top cover layer is provided. The at least one second filter layer is folded to a second bellows. The first and second bellows are folded identically. The at least one second filter layer is arranged on the first filter layer in a positive-locking way by fold alignment of the first and second bellows to form a composite of filter layers.

Abstract: A filter element has a filter medium that is made of at least two filter web layers and an adsorptive layer of adsorptive particles which adsorptive layer is substantially enclosed by the at least two filter web layers with the exception of lateral open edges. A sealing compound seals the lateral open edges at least during manufacture of the filter element. A frame part is attached by injection molding to the filter medium after sealing the open lateral edges with the sealing compound.

Abstract: An apparatus for separating aerosols or particles from a gas stream composed of a flow housing through which the gas containing the components to be separated flows, a separator, which is arranged in the flow housing, and a corona electrode, which is provided upstream of the separator in the direction of flow. The corona electrode is located substantially outside the gas flow. An air volume stream from the corona electrode flows into to the gas flow to transport charge carriers generated by the corona electrode into a charging zone in the flow housing.

Abstract: An apparatus for separating aerosols or particles from a gas stream composed of a flow housing through which the gas containing the components to be separated flows, a separator, which is arranged in the flow housing, and a corona electrode, which is provided upstream of the separator in the direction of flow. The corona electrode is located substantially outside the gas flow. An air volume stream from the corona electrode flows into to the gas flow to transport charge carriers generated by the corona electrode into a charging zone in the flow housing.

Abstract: The invention relates to a multi-layer filter element. The invention provides a main filter layer which preferably consists of a melt-blown fleece and has an absolute filtration capability. A paper layer (2) on the clean side supports the filter element and does not contribute to the filtering of the fluid to be filtered. Said layer can therefore have a macropore structure, thereby allowing a low flow resistance. A layer (3)on the clean side which preferably also consists of paper serves to pre-filter the fluid and to protect and support the main filter layer. The inventive design of the multi-layer filter material provides a means for economically producing filter elements, especially filter cartridges which are folded in the shape of a star, since no trellis protective layers are necessary. The invention also facilitates an improved thermal disposability of the proposed filter cartridge.

Abstract: An arrangement monitors the useful properties of pressure fluids (5) in fluid-technical installations. A plurality of measured variables, each representing a useful property of the pressure fluid, are determined by a plurality of sensors (13, 15, 17) which are combined with a pump (11) to form a structural unit which can be build into a tank (3) containing the pressure fluid. The sensors (13, 15, 17) are hydraulically connected in series with the pump (11).