CV control valve

[justitia]

Hello,

How can I figure out the flow coefficient CV under certain conditions?
The fluid is a gas.
Data available are: mass flowrate, inlet pressure, pressure drop, inlet temperature, vapour molecular weight,
compressibility factor, viscosity at inlet temperature and specific heat ratio.

I need to figure out it for a control valve with non-critical flow (dp<0.5p1).
Is it the same for any other type of valve?

Thanks.

 

[gerhardl]

1. You ask the supplier or go to the link below.

2. Not the same, see link below.

http://www.engineeringtoolbox.com/flow-coefficients-d_277.html

 

[JLSeagull]

http://www.documentation.emersonprocess.com/groups/public/documents/book/cvh99.pdf

-
Download the Control Valve Handbook. This includes the formula for sizing control valves in gas service and more. Contact your control valve peddler and request a sizing program.