The complete determination of stroke/throughput curves at steam turbines for arbitrary valve positions usually only follows after the fundamental Layout of the control valves, of the possible nozzle segments and of the turbine blading. A general fundamental equation and some design norms based on it are presented which may serve already before a fluidic Layout of the turbine in detail as an optimizing predetermination of the properties concerning pressure Loss and control statics of the metering components in the admission area.