A problem of energy losses reduction in the steam flows through different channels and flow paths of steam turbines is one of the issues of the day in turbo machinery. In the report a comparative numerical analysis of two design options of control valve blocks and two different confuser pipes located upstream the control valves are presented. The aim of the research was minimization of energy losses in the control valve blocks and confuser pipes. The investigation consists of two parts. In the first part a numerical study of steam flow through two alternative designs of the low pressure control valve block is discussed. Another investigation presented in the report aims to selection of the optimum design of confuser pipes supplying steam to the control valve block. The cone angle and length of the pipe were varied in the study. As a result of the work optimal design of confuser pipe and control valve block was chosen in respect to energy losses decrease.
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