Abstract: A filter device comprising: filter elements with wall openings on their internal ring and filter elements with wall openings on their external ring the elements being alternately stacked; an external housing; an internal filter conduit, which is configured through the internal ring walls of the filter elements and is connected to filter elements in addition to a first fluid conduit via the internal ring wall openings; and an essentially annular filter material that is located between two respective filter elements. The front faces of the filter elements have essentially planar, peripheral external and internal sealing surfaces, which, when the filter elements rest one on top of the other, clamping filter material therebetween, lie above one another and are rough.

Abstract: The invention relates to a filter means for filtering gases, liquids or similar filtering media, preferably for process engineering plants, e.g. those for the foods and drinks industry, such as for compressed air preparation, particularly in sterile operation, optionally under overpressure conditions and/or at high temperatures, in which there is a segmental construction, formed by essentially circular filter elements, against which a flow can take place from the inside and outside, together with interposed, disk-shaped filter material and in which the entire edge area of the filter material sealingly cooperates with the filter elements.