For the experimental verification of a new emergency stop and control valve design extended tests on a low pressure as well as a high pressure air test rig were performed. As the required thermodynamic parameters for a full scale test cannot be met, a scaled version of the valve design was tested. The scaling was done taking into account the laws of similitude. The inherent valve characteristics as well as pressure distributions and forces were gathered by means of steady and unsteady probes. While the tests in the low pressure test rig were performed at similar Mach numbers, the high pressure tests were performed also with Reynolds numbers sufficiently similar. A transformation of the pressure pulsations to the real steam valve was done by means of the Strouhal number. In the low pressure test rig ambient conditions were used for the inlet air. A vacuum pump was delivering the airflow through the tested valve model. The valve model was equipped with approximately 50 test points. For the high pressure test rig a six-stage radial compressor with interstage cooling was used. The valve model was equipped with approximately 40 test points. Due to the limitations of the compressor and other adjacent systems the tests in the high pressure test rig were conducted with a stepped operational concept using different mass flows and inlet pressures for the tested valve model. The inherent flow characteristics as well as the pressure pulsations of both measuring campaigns were compared with one another. Matches as well as mismatches are discussed. Additionally, the results were compared with steady state and transient CFD simulations, which is described in Part 2 (GT2014-25117).

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