The purpose of this article is introduction to experimental research of steam turbine control valve executed in Doosan Škoda Power (DSPW). First part describes air test rig, model, location of probes and measurement instrumentation. Second part describes measured data in time domain. There was done frequency analysis of signal obtained from pressure KULITE probe e.g. fast Fourier transform, power spectral density estimation, etc. There are shown results obtained also from other probes in this article. The main aim of this research is reveal nonstationarities, which can appear in turbine control valve during operation especially during part-load.

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