-----Original Message-----
From: Land N Sea <landnsea1@hawaiiantel.net>
To: personal_submersibles <personal_submersibles@psubs.org>
Sent: Wed, Jan 4, 2012 1:27 pm
Subject: Re: [PSUBS-MAILIST] Valve Advice
Does the hull stop still need to be a needle valve if
the O2 is LP when it enters the hull instead of HP?
Rick
Sent: Wednesday, January 04, 2012 9:33 AM
Subject: RE: [PSUBS-MAILIST] Valve Advice
I agree with Vance, if I had ball valves for blowing the MBTs,
where I have the needle valves now, it would probably work just fine. The
one case in which you can't use a ball valve, however, is with HP oxygen. Even
the hull shutoff for O2 has to be a needle valve. The reason is that a ball
valve starts and stops the flow quite suddenly, and the pressure bang can
trigger an oxygen fire.
We used ball valves throughout, save for cabin
oxygen. You can control flow quite easily with a ball valve (for the MBTs, for
instance) and the good news is that you will have a smaller inventory of spares
to deal with. Same with my subs at home. Whitey ball valves. Rebuildable and, in
any case, virtually indestructible.
Vance
-----Original
Message-----
From: Smyth, Alec <
Alec.Smyth@compuware.com>
To:
personal_submersibles <
personal_submersibles@psubs.org>
Sent: Wed, Jan
4, 2012 7:27 am
Subject: RE: [PSUBS-MAILIST] Valve Advice
Hi James,
I use 1/4" Swagelok valves for the HP lines. Ball valves for
the hull stops, needle valves for control.
Thanks,
Alec
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Hi All,
Does anyone have any advice as to what type of valves i should use for the
high pressure air control?
I have all my hull stop valves and vent valves
sorted, these are just the last few. Plans call for Diaphragm
valves.
But, my system will be 3000psi, not the 150 ish George used.
I believe Alec uses needle valves?
Im not sure what to get. Needle? Diaphragm? Ball?
The system is going to be more or less as per the plans but 3000psi and
with double tanks fitted.
Any advice as to what other people have used much appreciated.
Kind Regards
James