Valve assembly for a servo system

describes a valve assembly for a servo system, in particular a steering valve assembly for a power steering system, as found for example in motor vehicles application, wherein an output member of the servo system in response learns of the position of a servo section in the manner of a preferably hydraulic power assistance, that upon exposure to a drive member of the servo system acting reaction force is converted into a control variable for the servo unit. The special feature is that a responsible for the storage of the drive member housing portion is directed under the action of the reaction force displaceable, wherein the displacement of the housing section for obtaining the manipulated variable for the servo section is used.