From the standpoint of power conservation, bondgraphs represent systems, even those composed of mechanical, hydraulic and electric components, by a unified approach. In this paper, a three-port pressure regulator valve is represented by the bondgraph, in which hydraulic resisters are controlled by orifices having overlap and underlap. The bondgraph of the resisters is constructed with two R-elements consisting of a linear resister and a squared resister. Additionally the effect of mixed air in the oil is easy to analyze by using the initial bondgraph and two additional C-elements. Dynamic behavior of this regulator valve is obtained easily by bondgraph simulation in comparison with the usual simulation methods.
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