RE: [PSUBS-MAILIST] MBT Vents

["Smyth, Alec" <Alec.Smyth@compuware.com>]

Hi James,

The link you sent is to the whole Snoopy page, so I'm not sure which
shaft you're asking about. Was there a particular photo you're referring
to? 

On the valves, I think I've found what I was looking for, and the term
seems to be "bar stock ball valves". However if you have a link of part
number I'd be curious what you've found. I have two complaints about the
ones installed now. They're not stainless, and they're ported way too
small, so it takes several minutes to vent the MBTs. 


Thanks,

Alec


-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of James
Frankland
Sent: Tuesday, March 09, 2010 5:25 AM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] MBT Vents

Hi Alec,

Ive seen this arrangement on your project page.
http://www.psubs.org/projects/1234567810/snoopyk250/

I thought it looked a little odd.  Is there no seal at all for the
shaft?  

>From peoples advice, i'll just do it as per Georges plans.  

Also, you mentioned about the ball valves.  I managed to get exactly the
valves called for on the plans.  If you like i can put you in touch with
the company i got them from, but i suspect you'll use somethig closer to
home.

http://www.guernseysubmarine.com/index_files/Page13993.htm

Kind regards
James


----- Original Message -----
From: Smyth, Alec [mailto:Alec.Smyth@compuware.com]
To: personal_submersibles@psubs.org
Sent: Thu, 4 Mar 2010 11:37:37 -0500
Subject: RE: [PSUBS-MAILIST] MBT Vents

On the regular K design the valve is screwed to the coning tower from
the inside and simply has a layer of sealant between the valve body and
the tower wall. No O-rings or anything. I've had issues with this
arrangement leaking, and on the new boat I've put in a proper SS
through-hull for the stem, which is sealed with an O-ring plus a backup.
However, I will say even when the K version leaks it's an irritant
rather than a danger. In my experience these leaks have taken the form
of a "weep" or slow drip, not anything that could actually flood the
boat in any meaningful way.


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From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of
ShellyDalg@aol.com
Sent: Thursday, March 04, 2010 11:17 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] MBT Vents


How is the valve handle sealed at the point where it penetrates the hull
? I've seen both configurations but couldn't see how the handle
penetration is sealed. 
Frank D.




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