2 replies to this topic

[3omar]

Hello,
I want to calculate the Cv of the valve , but the inlet feed is mixed phase, so the problem is in the specific gravity value . So can I take the density of water to be the reference density ?

Thanks in advance .

[Saml]

It is very unusual to have mixed phase at the valve inlet. There are applications, like a wellhead choke, by they are few.

 

So please, provide more details about the application you are designing. There is probably a way of doing it without two phase control valve.

 

Anyway. Check the following thread on this forum

 

https://www.cheresou...two-phase-flow/

[latexman]

Liquid water is THE world wide, universal reference for density, especially liquid density.  It's the specific gravity, or density of "X" / density of water.  So, yes, you can use water as the reference density, BUT the value you give the control valve vendor must be characteristic of the valve's inlet, and not to water itself.  You still have to do the hard work to determine the density of inlet feed at inlet conditions.  You should also indicate it is mixed phase in as much detail as is needed.  Otherwise, if you use the density of water, you'll get a water control valve that is probably useless in your application.