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Development of new actuators, materials and technology for the production of advanced pneumatic and hydraulic valves-materials selection

By Vineta Srebrenkoska, Dimko Dimeski, Gordana Bogoeva-Gaceva, Niko Herakovic and Viktor Stefov


The main goal of DE_AMATECH EUREKA project is to develop new actuators and new materials, as well as technology, for the production of piston valves with much better dynamic properties and lower energy consumption compared to the traditional valves made of metals. one of the major parts of the whole valve assembly is the piston itself, which contribution to reaching the main goal of the whole project is of crucial importance. The main requirements for the piston are: to be lighter than the metal counterparts; to withstand the working pressureof the valve; to be friction and abrasion resistant - the property which is directly related to the working life of the piston on one hand, and as well as that of the whole assembly (calve) on the other hand. To meet these requirements we have taken two distinctive different approaches: the first one is, to develop an alternative/advanced material or to choose existing engineering material which will be coated with hard metal layer. This material, besides its mechanical strength to withstand internal (working) pressure of the valve, must be hard enough nd high temperature resistant so that it will wiyhstand the coating process, which requires hard substrate and high temperature resistance of the coated material. The second one is to develop an alternative/advanced material which will meet the exploitation requirements for the piston without being metal coated i.e. only "pure" material. The materials besides its mechanical strength to withstand internal (working) pressure of the valve, must be friction and abrasion resistant; must be capable of undergoing precise maching and must not swell when dipped in hydraulic oil i.e. must have very good dimension stability during the working cycle of the valve. In this work we report the results of the preliminary functional test of the pistons. Also we reported about technical advantages/disadvantages and cost effectiveness of each of the two approaches as well as of the potential piston materials for each approach for future to fully meet the target properties for the piston made of alternative/advanced materials

Topics: Materials engineering
Year: 2010
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