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
From: Smyth, Alec
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. From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of vbra676539@aol.com Sent: Wednesday, January 04, 2012 1:14 PM To: personal_submersibles@psubs.org Subject: Re: [PSUBS-MAILIST] Valve Advice 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 The contents
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From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]
On Behalf Of James Frankland
Sent: Wednesday, January 04, 2012 12:17 PM To: personal_submersibles@psubs.org; member-forum@psubs.org Subject: [PSUBS-MAILIST] Valve Advice 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 |