I am trying to bring a pressure of Nitrogen or Oxygen gas from around the 300Bar relative (4351.1Psi) to just over the atmospheric pressures. To do this the first thing that came to mind was to use a needle valve. However I am not sure if this is the best way to go? I am trying to keep the weight and size to minimum. Therefore I am trying to avoid using any intermediary pressures reducers if possible. Some of the analyzer pressure regulators such as GO can do this for small flow rates. However, there is no mention of the volumetric flow in the post. One solution would satisfy 1/4" OD tubing, a different solution would apply to 8 NPS pipe. BTW, the solution for oxygen could be very different than for nitrogen. Per chance are you trying to mix one of the diving gases, Nitrox, Heliox, Trimix, etc. I must caution as I know of two fatalities associated with supposedly off standard mixtures of these gases. Even though the mixing of these gases is straightforward there are several input variables that can complicate the calculations. A gas mixture computer is almost a necessity.

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