[PSUBS-MAILIST] Flush Mount Valves in MBT's

Sun Dec 8 15:58:58 EST 2013

Joe,
Minimizing residual air in an MBT would be a consideration for me, but it would be the last consideration after first determining the best valve design for function, controlability, durability, and maintenance.  At that point you can set the air vent as close to the top of the tank as possible and allow for any residual air in your design calculations.  I expect the size of the bubble will be minimal.  In your design, how much of a consideration is the amount the valve assembly projects above the top of the tank?
Jim

-----Original Message-----
From: Joe Perkel <josephperkel at yahoo.com>
To: personal_submersibles <personal_submersibles at psubs.org>
Sent: Sun, Dec 8, 2013 2:13 pm
Subject: Re: [PSUBS-MAILIST] Flush Mount Valves in MBT's

Hi Alan,

That's similar to a Kingston isn't it? That shape would assure complete venting, one would have to be assured of fail safe reliability in whatever was used. I would like a normally closed fail safe mode in whatever style best assures sealing.

Joe

Sent from Yahoo Mail for iPad

                                                            From:                                                        Alan <alanlindsayjames at yahoo.com>;                            
                                                            To:                                                        Personal Submersibles General Discussion <personal_submersibles at psubs.org>;                                                                                                     
                                                            Subject:                                                        Re: [PSUBS-MAILIST] Flush Mount Valves in MBT's                            
                                                            Sent:                                                        Sun, Dec 8, 2013 7:10:19 PM                            

Hi Joe,
While thinking about the ballast valve, it occurred to me that
the drain pop up plugs found in modern bathrooms, are very
similar to what we want.
https://www.google.co.nz/search?client=safari&hl=en-gb&biw=768&bih=928&tbm=isch&sa=1&ei=47ukUvT-EsqhkwWt04DoAQ&q=drain+pop+up+waste&oq=drain+pop+up+waste&gs_l=img.3...46028.57398.0.58014.39.28.0.2.2.0.324.3866.8j5j4j5.22.0....0...1c.1.32.img..27.12.2132.cLok805IcCc
Hope that link came out OK. It was an image search on DRAIN POP UP WASTE
They would need to work upside down for our application, so they would be flush on the
inside of the ballast tank (eliminating an air trap) but extend a bit above the ballast tank.
Some models look like you could just stick an air line straight on to them, & with a spring 
In them, they would work.
There may be some model that is ideal.
Alan
Sent from my iPad

On 8/12/2013, at 2:09 PM, Joe Perkel <josephperkel at yahoo.com> wrote:

I need a little help understanding the installation ofremotely operated pneumatic valves in soft tanks. I’ve been looking at variousproducts on the Net, and from what I see, there doesn’t seem to be an off theshelf remotely operated valve that would install flush and fully vent the tank.What I’m looking for is a flush mount and a clean installation which eliminatesthe exterior tubing routed to the conning tower.
Am I missing a valve type or installation that wouldaccomplish this?
Thanks
Joewith 

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