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The evaluation of fluid forces on the stem is important for wear predictionof valve and actuator guidance parts. While estimating the axial load isstraight forward, estimating and/or measuring the side load is more difficult,especially for globe valves. Therefore, measurements are carried out on an adhoc, scale 1, model of a 2" globe valve. The body is replicated in Plexiglas toenable flow visualization and the original stem is heavily instrumented toallow force measurements in every direction. The flow loop facility used forthis experiment is designed to allow fine-tuning of the cavitation intensity.The experiment is run for a set of cavitation conditions, flow rates and discpositions. The results show that the transverse force (perpendicular to thestem) can reach the order of the axial force; thus it should not be ignored. Wealso observed that it depends very weakly on the cavitation levels. Videos madewith a high-speed camera allow an interesting understanding of the fluid flowand the cavitation creation. Moreover, CFD simulations of this experiment,limited to the single phase flow are compared to the experiments. Through theexperimental testing, visual observations, and computational predictions, therole of the cavitation on the fluid forces is better understood.

Measurement Of The Fluid Flow Load On A Globe Valve Stem Under Various Cavitation Conditions