Investigation of two concepts for piezo-electrically driven bistable hydraulic switching valves

This paper deals with the investigation of two actuation concepts for hydraulic switching valves which utilizes a piezo stack and a bistable mechanism. The goal of this work is to show concepts with which small and compact light-weight hydraulic valves can be designed and to pave the way for their integration in exoskeleton applications. The paper shows modeling and design aspects of a valve prototype and discusses measurements which were taken throughout the design process as well as final measurements of the valve’s switching behavior. Finally, possible improvements for robustness, miniaturization and increased dynamics are suggested.