The article presents a construction of new series of type of single valve sections destinated for operation in hydraulic systems of mechanized mining shield supports. The series of type meets all requirements of the PN EN 1804-3:2004 standard being in force in European Union. Besides the section construction description some working characteristics of valve sections and their technology characteristics were shown. All construction changes in a new valve section structure in comparison with the sections used at present were also detailed.
W artykule przybliżono problematykę nieszczelności wewnętrznej występującej w stojakach hydraulicznych sekcji obudowy zmechanizowanej. Przedstawiono wyniki kilkuletnich prac nad opracowaniem nowego zastoso wania konstrukcji bloku zaworowego z dwoma zaworami zwrotnymi oraz zaprezentowano wyniki badań stano wiskowych i w warunkach rzeczywistych.
EN
A powered roof support is an integral element of a longwall complex while a hydraulic leg is the basie component of the support. The operating characteristics of the section, and then of the entire powered roof support, depend on its operating parameters and reliability. This also has a significant impact on the efficiency of the entire longwall complex. The correct operation of hydraulic leg is therefore of key importance to the mining process. One of the things that can disturb the work of the leg is internal leakage which negatively impacts on the performance of the leg. Two types of tests were conducted to precisely determine the impact of these leaks on the leg's operating parameters: bench tests and tests in the actual conditions. The research included an analysis of operation of the leg for two currently used valve blocks and a new błock design to minimize the effects of in ternal leakage. The results confirmed that the developed valve błock design is suitable for underground systems. It managed to limit the negative effects of internal leakage in the leg both during bench tests and in underground conditions. The results can find broad application in legs used in sections intended for use in difficult mining and geological conditions.
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