DP across modulating steam valve

[drafty888]

Looking for some sage input on the following...

25psi inlet steam to a modulating steam valve with a 195 #/hr load. I've calculated this application to require a 3.32cv valve. I can only get a 2.2cv valve or a 4.4cv valve.

So, my question is this: does anyone have a calculation to determine DP on a steam valve knowing these variables: valve actual cv, steam load, and inlet pressure.

I need to know the theoretical DP with the two valve options so I can pick the lesser of two evils. Otherwise the choice between the valves is arbitrary. But all steam valve sizing calculations I can find only compute CV when you have a desired DP, and not the other way around.

Thanks for any input, and please correct my thinking if I'm approaching this incorrectly.

[DaveCR]

Try this calculator.
http://www.controlpix.com/steamvalve.html

[drafty888]

Thanks, that's exactly what I was looking for.