A simple equation is derived for conversion of capacity index values to velocity pressure factors based on the main pipe size. The equations for the use of capacity index in Imperial and SI form are presented together with the conversion factors.
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References
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1. Threthowen, H. A., Control valve performance, JIHVE, 37, 232–240, (1970).
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2. Wolsey, W. H., A theory of 3-way valves, JIHVE, 39, 35–51 (1971).
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