Szukana fraza: [Abstract = "The results of the investigation of the prototypical ball valve are presented in this article. The innovation of the tested valve is a ball with a built\-in measuring orifice. The valve has been subjected to durability tests. Leakage under three temperatures\: ambient, \-30 degress C and \+100 degress C was analyzed. Sealing elements of the valve were tested for roughness and deviation of shape before and after the cycles of operation."]

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