How do convert cv to cg ?
I know that cv = constant x kg
Cv [US Gallons/min/psi] = 0,03445 KG [m?/h/bar] (related to natural gas, density = 0,83 kg/m?) ( by manufacture).

PA83, are you talking about converting between Cv and Cg where Cg is the Fisher valve coefficient for gases?

As said, Cg = C1 * Cv.

I'll typically look up the C1 as it varies depending on the type of control valve, conventional style globe valves are usually around 30 but it can be quite a bit lower

If you can clarify what you want it would help, the hydrogen conditions by itself doesn't have anything to do with the Cv or Cg.

Fisher published tables with the obsolete gas sizing coefficient long before ISA and IEC established the current control valve sizing formuli.  Consider avoiding obsolete vendor constants such as Cg since these International organizations publish concensus standards using Cv or Kv.

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