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

[Joe Perkel]

Hi Vance,
Flush mount meaning that the valve body itself is within the
tank and flush with the upper surface. Since the body of the valve protrudes
down into the tank, I’m wondering about trapped air like rainwater on a house collecting
in low spots on the roof and not going down the gutter. 
The question was prompted by my virtual but acurate construction of the as drawn K-350 in order to better understand it's workings prior to any real attempt at redesign. Im currently on the tubing diagram, but things like this prompt me to think ahead a bit.
I really really like the up high and straddled MBT set ups on the big guys like Alvin and JAMSTEC’s Shinkai with remote vents in each of the two tanks. I would want to emulate that very set up.
Joe



On Saturday, December 7, 2013 9:54 PM, "vbra676539 at aol.com" <vbra676539 at aol.com> wrote:
  
Flush mount? Not sure what you're thinking of here. Pneumatic valve suggests a valve operated pneumatically. That's relatively easy in the home shop at whatever diameter you prefer. Hyco used them on everything, as do all the tourist subs out there. Otherwise, you'd mount a valve on the tank's high point and operate it with a reach rod from inside, like the Perry boats. I'm with you about the tubing run. Bad design. You'd want to reduce that to a minimum or none at all. 
Vance



-----Original Message-----
From: Joe Perkel <josephperkel at yahoo.com>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Sat, Dec 7, 2013 8:09 pm
Subject: [PSUBS-MAILIST] Flush Mount Valves in MBT's


I need a little help understanding the installation of
remotely operated pneumatic valves in soft tanks. I’ve been looking at various
products on the Net, and from what I see, there doesn’t seem to be an off the
shelf 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 eliminates
the exterior tubing routed to the conning tower.  
Am I missing a valve type or installation that would
accomplish this? 
Thanks 
Joe     
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