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Nachweis der Funktionsfähigkeit eines Flachschieberventils mit Keramikkomponenten für die Hydraulik

Cylindrical spool valves made of steel, as commonly used in hydraulics, feature disadvantages, of which two are considered in this project. The first drawback is the ring shaped gap between spool and bushing, which leads to leakage, thus losses. This gap is determined by manufacturing accuracy and the pressure-dependent expansion and cannot be reduced. The second drawback is the wear of the control edges when particle loaded fluid flows across. In flat spool valves with plane parts touching each other this leakage can be prevented. Furthermore, the use of wear resistant ceramics suggests itself due to the option of cost efficient purchase of ceramic sheets with high quality flatness. However, flat spool valves require a pressure compensation when used at high pressure to enable the spools motion despite the friction between the moving parts. In this project such valves are investigated together with the Institute for Material Applications in Mechanical Engineering (IWM) of the RWTH Aachen University. First possible pairings of ceramic materials are studied, then a ceramic compatible design is found. Finally, the research focuses on the hydraulic operation behaviour and the pressure compensation. The aim of the project is to prove the functionality of such novel flat spool valves.
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