J Valve - how does it work?

Does anyone even use these anymore? I've never seen one in real life, only in the PADI book.

Never seen one in 15 years of diving. Have seen the remains, e.g. the little clip molded into cylinder boots and apparently that's where the fifty bar sign came from.

If i remember right the valve is set to close at a set pressure say 50bar. So at 50 bar it close and no air will get to regs. Pull a lever on the cylinder and it opens the valve again. Was used when spg's werent around so people knew how much gas they had left.*

This could all be wrong but i think its right

And if you didn't set the valve before you dived there was no reserve.

I have seen them used in a sealife centre about 10 years ago, they used them for some health and safety reason.

Paul Burgess said:

Can anyone direct me to a link for how a J valve works (the one that has a reserve released by pulling on a lever)?

I am curious.

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Is there an old bargain cylinder on e-bay mate?

Kev said:

Is there an old bargain cylinder on e-bay mate?

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Seriously........ NO!

Thanks for all the answers chaps