Don’t know much about it except what cane up in that thread, nor many other examples — just the one, the TBP:Care to elaborate?
I have the TBP on my 82X (a heavy reg) and on my 28XR. It's really quite ingenious (though not completely new - the Dacor Extreme had a plastic oring sealed sleeve piston that acted the same way).
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In any case, this floating piston head acts like the diaphragm, sealing against a smooth inner sealing surface just like a piston reg. The pin that opens the valve is connected to the piston head, and the seal above is a similar floating piston-head-like device that accepts the load of the environmental seal. Connecting the two together maintains the alignment of the sealing piston head that substitutes for the diaphragm.
Thus you have a dry-sealed reg with all the advantages of a diaphragm (crisper lockup for longer) but no constantly flexing diaphragm.
Time will tell if the oring seal does better than the diaphragm, but at least no more of these:
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Mares has tested the 28XR to 200m.
Maybe Mares' purchase of the corpse of Dacor finally paid off with something other than headaches and bad feelings.
I'm picturing an engineering intern being told to go through a bunch of boxes that were dumped off in 1998 (before he was born), seeing the testing docs on the Dacor Extreme and thinking, "You know. With a little work we might just have something here."
There’s an example where this backfired, Head buying Revo and making the Mares Horizon based on it — horrible piece of ewaste
Thankfully Revo is still alive and well