Abstract: A method for operating a combustion engine having a crankcase, a piston group and a crankshaft, wherein the crankcase has an oil reservoir and an operational amount of lubricating oil is provided, wherein i) a partial amount of the lubricating oil is continuously discharged from the crankshaft and ii) a refill amount of new lubricating oil is continuously supplied, so that the operational amount of lubricating oil remains essentially the same; as well as a combustion engine for carrying out the method.

Abstract: A filtration system for separating accompanying substances, present in liquid, droplet or mist form, from a gaseous material stream, comprising a housing, in which there is arranged a filter insert, wherein the housing has an inlet and an outlet for said material stream, wherein the filter insert comprises at least two filter layers, wherein one boundary surface of the first filter layer is essentially in parallel with a boundary surface of the second filter layer, wherein at least one boundary surface forms a barrier for said material stream.

Abstract: A filtration system for separating accompanying substances, present in liquid, droplet or mist form, from a gaseous material stream, comprising a housing, in which there is arranged a filter insert, wherein the housing has an inlet and an outlet for said material stream, wherein the filter insert comprises at least two filter layers, wherein one boundary surface of the first filter layer is essentially in parallel with a boundary surface of the second filter layer, wherein at least one boundary surface forms a barrier for said material stream.

Abstract: A check valve includes a housing with an inlet opening and an outlet opening along with a cage-like insert disposed therein as a support for a spring element and for guiding a closing body which can be moved against the spring element and which can be moved between a first end position, in which the spring body lies in contact with a seat to form a seal, and a second end position, in which the valve is completely open. The closing body, which is constructed cylindrically and pot-like, is guided with its cylindrical casing surface at the cage-like insert and in contact with the seat with a flat outer surface.