The final thesis represents characterization of proportional directional control valve of water hydraulics. It is a product of water usage in hydraulics research which started approximately in year 2010 based on a phD thesis written by Franc Majdič and other further diploma and final theses. The issue of oil hydraulics are the negative ecological results caused by its use. Hereby the measurements of a current prototype of the proportional directional control valve are presented; move proportionality, internal leakaging and different pressure characteristics - ∆p(Q) & Q(s). The analysis of results and proposals for further work follow.
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