Upstream pressure is 2 atm (absolute) - so around 28 psia. I did find some relations in regards to the pressure loss based on the Cv (from the Handbook of Valve Selection). I am not sure on how accurate it is, but it states that:
dP = z*0.5*rho*V^2 (where z is resistance coefficient)
z =...
It does eventually exit out into the atmosphere, but there is a lot of piping/lines before that. The line eventually combines with a separate methane line that goes through a combustion chamber and then finally exits into the atmosphere. It seems unlikely that the pressure at the outlet of the...
I am trying to size a needle valve to make sure that it can allow the required flow rate at the fully open position (0.025 m^3/s). For a given Cv you should be able to calculate the maximum flow rate through the needle valve provided that you know the temperature of the gas and the pressure drop...
