I require a pressure reducing manual spring loaded regulator to control the drive gas pressure for driving a medical ventilator inside a pressurised hyperbaric chamber. The drive gas pressure for the ventilator needs to be 4 bar. The drive gas supply line to the regulator will be 50bar supplied from an outside line penetrating (gas tight seal) the chamber wall to within the chamber.
Assuming the pressure within the chamber is 20bar, does the outlet of the regulator need to be 4bar or 24 bar ?
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