A pressure limiting valve is provided which has a valve body assigned on the high-pressure side to a valve seat and an operating piston combined with the valve body to form a unit. A conveying unit conveys a sheet. Also, based on the combination stored in the combination-storage means, a registration-event-extraction means extracts one or a plurality of registration events relating to a procedure subject selected by the user. The damping control assembly includes a housing comprising a rotor chamber including a rotor member located therein. The invention further relates to the polyisocyanate mixtures obtainable by this method.