Poseidon Regulator Reliability…

[Bigbella]

@Tracy, so inline with what Bigbella said - should a shut-off valve not solve the problem for the upstream regs, too?

It was never an issue with the Jetstreams with their switches off — or the Xstreams either, provided that they’re well-tuned. We never closed the valves with ponies, stage or deco bottles, in the first place; and there was never any issue over more than four decades; but I do realize that that practice is verboten by the GUE folks — so too, co-called upstream regs, for that matter.

I typically soak my pressurized equipment on a pony, etc, for hours on end, and there has never been any loss of gas . . .

 

[jborg]

I'm slightly skeptical of a purged Xstream/Jetstream second resulting in a flooded first stage during valve drills, to be honest. The natural state of the rubber valve insert is closed, it opens up due to gas pressure until the servo valve seals... Also, the second stages tend to be below the first stages while in any sort of horisontal trim. So water would need to force itself past the valve insert and flow upwards into the first stage...

I'm sure it can happen in a suitably convoluted situation, but I doubt it's a problem in practice. At least, less of a problem than it being a major pain in the ass to do full a valve drill with these second stages to begin with, given all the freeflowing going on when you open the valves.

 

[Bigbella]

Slam opening was probably a poor choice of phrase. I can always rely on @Tanks A Lot for an erudite discussion.
We are not at odds, and the statement buried late in my comment stands:

If you were taught to take 3 minutes to open a 100% O2 tank, as one conservative CCR Instructor opined, you will be unhappy with a Jetstream or Xstream.
What is probably needed is a demo video. Perhaps someone will help us out. The valve will likely not seal until the dynamic IP exceeds 70 psi, because the servo is venting faster than the servo compartment is filling via that sintered flow restriction, when the IP is still that low. So get past 70 psi within however many seconds you can tolerate venting that oxygen.

No big whoop . . .

 

[Tracy]

@Tracy, so inline with what Bigbella said - should a shut-off valve not solve the problem for the upstream regs, too?

It would, but why? Literally any other reg on the market would be a better choice for a deco bottle. Why would you intentionally choose the one that does it worst and then add things to make it almost as good as everything else?

Just use them for backgas, that is where they excel.

 

[Bigbella]

It would, but why? Literally any other reg on the market would be a better choice for a deco bottle. Why would you intentionally choose the one that does it worst and then add things to make it almost as good as everything else?

You used what you had on hand — and we had Poseidon in spades, back then; and they never posed a problem, even under the harshest of conditions . . .