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From: J Shepherd <jms@fe*.ed*.ac*.uk*>
Subject: Re: J-valves - word of caution
To: techdiver@terra.net
Date: Sat, 23 Sep 95 10:00:17 BST


	IME of J-valves (I used some on some of those shitty al80 in
Thailand this spring) three things could occur. Either on reaching the
reserve the reg would tighten (this never actually happened); or the reg
would breathe normally but the HP needle would deflect; or there would
be no effect at all (50/50 the last two effects).

	The reg was a Poseidon Jetstream. In the end we just opened them
when filling and left them that way, used them just as supply tanks for
the air lift or I tried to shunt them to the BFH.

	Horrid things. Rather like double declutching.

	But then, we also had three tanks that leaked (badly) between
pillar valve and tank, and one which could have it's pillar valve
removed when there was 15bar in the tank. Smelly wetsuit time.

	Jason.

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