This article describes the development process for a new control valve by means of Parametric Modelling Technology for the inner geometry of the valve housing. Typically a development process starts with a fixed 3-D CAD model. Subsequently the hydrodynamic properties of the design (such as the flow resistivity of a pipe element) are then calculated by CFD using standard boundary conditions. Very often and based on the calculation results the engineer has to adjust the model and then starts the loop again. In our case the design object is defined by a variable parametric geometry only. In a computerized iteration process using an upfront CAE tool, the system will automatically converge to an optimum solution. The results are amazing.