and so, master sean, does this chart imply that any quantity of propane in a closed sytem of any volume will expand to 150 psi @ 90 deg F ??

Or does this mean that >150 psi is required to liquefy propane at 90 deg F?

My best guess is the latter.

To dumb this down for the business majors in the room (me); as long as I keep the charged system <= 90 deg F it will remain at <= 150 psi.

I've seen 150 psi in my retract system w/out a resulting bang/pop/hiss, so i should be good, right?

I need to know because while I have found LOTS of the correct trigger valves, but no one will sell 'em to me cus I'm just not cool enuff to be part of the club, thus my intense curiosity in propane. That and the fact that every wal-mart this side of east everywhere stocks it and practically gives the stuff away!!
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Thanks, as always for your collective patience w/ my newb-ness. And my apologies if I've diverted the thred off track a bit.

PS, my 1st jet, a Boomer XL is finally assembled and sitting on it's gear and the "guts" are going in now. I know, I know...WAY off topic. But I'm so tickled I just had to tell someone! Thanks for listening, I feel much better now.