Well i dont know how to use GGDT, sad i know

I have been informed that there is a page on GGDT website that can help but i havent taken a look at that.

But thats not what i am here to talk about.

Since i want to use GGDT, i need to find out how to get a flow coefficeint, and i have done some research and have seen this formula: Cv = K * D^2 which was posted by ragnarok here.

But as he mentions in the topic, that is not the correct formula for Cv. So, i went searching on the internet to find the correct formula. As a result, i found this formula (scroll down to the Gas flow formula, first formula).

So i am wondering how would i figure out this formula, because i am kindof bored, and i am learning Java this semester, so i want to make a program that gives you a flow coefficient.

So can one of the knowledgable engineers here help me out with better understanding of the variables in the formula? (which the variables are defined next to the formula)

EDIT: there are also tables that show Cv's, but im not sure if those can be applied to the valves we use.

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