The simulation of fluid flow in safety elements of longwall shield support hydraulic legs

The paper presents the research on pressure variation in elements securing the shield support against overloading. The chosen constructions of connecting pipe were analysed and its flow characteristic were determined. The operational parameters of different connections were also considered in light of their interaction with whole hydraulic control system. The results allowed to determine of the optimal connecting pipe curve with regard to the pressure in whole pressure safety system. (paper)