control valve sizing

[amshah]

General rule of thumb is

Valve size in inch * Valve size in inch X10

that is for 1" Max Cv = 1X1X10 = 10 Cv
for 2" Max Cv = 2X2X10 = 40
3" = 3x3x10=90 Cv

This is rule of thumb, max Cv for selected valve size changes based on modified trims available with vendor but it remains 10 % here and there.

For sizing a valve based on your process data follow following link,

[link Point to another website Only the registered members can access]

control valve sizing software is available in Instrument forum

[link Point to another website Only the registered members can access]