On Friday, January 24, 2020 at 10:00:09 AM UTC-8, John Foster wrote:
On Thursday, January 23, 2020 at 9:40:13 AM UTC-7, John Foster wrote:
On Thursday, January 23, 2020 at 6:15:07 AM UTC-7, wrote:
...calibrated to deliver 15 -20 psig of dynamic pressure"

Any pressure regulator supplying a constant pressure...

There is definitely a potential surge problem there.

The EDS regulator is special in being designed to switch from no flow to lots and back while keeping the output pressure reasonable.

If you wish to gamble with yourself, then perhaps a surge tank after the regulator to improve the odds. A pulse-ox to keep an eye on the contraption might also be a good idea. But the words 'good idea' might not fit the situation?

From what I'm reading, it seems most medical "yoke-style" (CGA870) regulators are rated more for gas FLOW, i.e. Liters per Minute, than for pressure, i.e. PSI. It is hard to find the PSI rating for these medical regulators, but one data point I found was that one was rated at 50psi, which is much higher than the EDS unit is designed to handle. It is the typical regulator where you can dial the FLOW from 0.5lpm to 15lpm. I realize that FLOW and PRESSURE are two completely different animals, but they are related and affect each other. Is there a way to set the FLOW rate to get the PSI at the desired 15-20psi? My gut tells me not really, but my physics is a bit rusty and can't prove it to myself.

Upon further research, it appears that medical oxygen is standardized at 50psi, both from the portable oxygen tanks, and from the wall outlets in hospitals. This would not work to use a medical oxygen regulator and just "dial it down", as the pauses between breaths, the reduced flow at low altitudes, would cause the pressure to rise between the primary regulator (50psi) and the EDS unit (15-20psi). You would need a secondary regulator between them to step the pressure down to 15-20psi, or you would damage your EDS unit.

Using medical O2 for aviation is akin to using a vet for your health care, wrong application. The vet might just shoot you for a broken leg.