control valve sizing spreadsheets

for two phase flow you can model the control valve with HEM (Homogeneous equilibrium) or HNE (Homogeneous Non Equilibrium) models,
these models have been verified by several authors (see the works of Schmidt and others) to give much better results than adding CV (or areas which is equivalent)
the software which I utilize, PRODE PROPERTIES, includes specific operations for solving these problems,
for additional information google for HEM or HNE-DS models.

thank you, i will try that then