So for our example, 2½” valve size will work fine.
OTHER NOTES Under
most situations, sizing of a control valve for liquids can be based on valve Cv using a simple flow equation. However,
in many situations,
other factors,
such as compressible flows,
choked flow,
viscous flows,
pipe size, elbows, pipe reducers/expanders etc. must be determined. Formulae for these situations
can be extremely complex, and the valve manufacturers should be consulted. Refer to the manufacturer’s catalogs for more details http://www.pro-quip.com/images/proquip/PDFs/Library/ValtekSizingSelection/SS_03.pdf
) http://www.cheresources.com/content/articles/fluid-flow/valve-sizing-and-selection?pg=2
