Diplomska naloga opisuje razvoj dvostopenjskega vodno-hidravličnega ventila. Vodna hidravlika postaja zaradi svoje ekološke neoporečnosti vse bolj smiselna alternativa oljni hidravliki. Navkljub razvoju vodne hidravlike ta še vedno trpi zaradi okrnjenega obsega in pomanjkanja raznolikosti pri ponudbi komponent. V nalogi smo preučili že izdelan – nedelujoč – prototipni dvostopenjski ventil. Poiskali smo razloge za nedelovanje ter zasnovali, nato pa izdelali nove sestavne dele. Izvedli smo analitične in numerične preračune tokovnih razmer. Rezultat naloge je delujoč dvostopenjski ventil, ki smo ga preizkusili v razponu tlakov med 50 in 200 bar, z največjim pretokom 30 l/min. Izmerili smo karakteristike delovanja ventila ter vpliv vsake komponente. Ugotovili smo, da je s primernimi konstrukcijskimi prilagoditvami izdelava dvostopenjskega vodnega ventila tehnološko dostopna. The thesis describes the development of a two-stage water-hydraulic valve. Due to its ecological sustainability water hydraulics is increasingly becoming a sensible alternative to oil hydraulics. In this thesis, we investigated a non-functional, two-stage valve prototype. We looked for the causes of its malfunction. New components were developed and manufactured. We performed analytical and numerical calculations of fluid dynamics. The result is a functional two-stage valve, that was tested in the pressure range from 50 to 200 bar, with a maximum flow rate of 30 l/min. We measured the functional characteristics of the valve and the effects of the individual components. We found that the production of a two-stage water valve with appropriate design adjustments is technologically feasible.
