To minimize the complexity of existing process control valves, the authors derived a new control valve design by functional separation and functional integration of functions. One key element of this new motor is operated with the process fluid, in this case water. The pressure difference to operate the motor comes from the valve itself. Within this paper we present the control valve design and show in detail how we used the Fail-Early design method to develop the hydraulic swivel motor. The

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... struction is discussed using the experience from manufacturing the prototype and the first experimental results are shown. The experiments yield, that the swivel motor principle is promising. Finally, the next development issues are discussed.