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Re: [PSUBS-MAILIST] ballast valve
Dan, I take it you've got a K-350 of your own? :-)
In my mind, I've got a picture of a tank, with two valves; one above
the other, with a rod between the two. In the hole on the top for the
top valve, there is a small amount of circular tubing going down into
the hard ballast tank (thanks for letting me know the right name :-)
), which the valve rests in. When the piston moves upwards, this has
made both valves open. When the piston is moved back to 'normal', both
valves are sealed. When the piston moves downwards, the bottom valve
is now open, however the top valve is still sealed by the extra length
of circular tubing, giving the three stages a hard ballast could be in
(flooding, normal, dumping).
The only part left in this little theory of mine is how to make this
piston move upwards and downwards. Could hydraulics be a possibility?
I tossed this idea around, but had concerns such as the hydraulic
hosing being exposed to exterior pressure, which would be greater than
its internal pressure, and forcing the hydraulic master cylinder to
burst.
On 7/3/05, Dan H. <jmachine@adelphia.net> wrote:
> Simon,
>
> What you are describing is the hard ballast tank. It's used to set neutral
> buoyancy. It has to be able to take the pressure of the deep from outside
> and you HP air system pressure from within. You have the operation down
> exactly correct.
>
> The open bottom tanks on a K-250, 350 are referred to as soft tanks. They
> are open bottom and do burp. They can be just about totally enclosed but
> you should leave a vent hole to the sea so you don't inadvertently leave
> some air in it and dive deep. They are not made to withstand neither the
> pressure of deep diving or your HP system pressure. These open bottom MBT
> tanks are used to raise the sub up out of the water so you can open the
> conning tower hatch and not flood the sub. They are either full of air or
> full of water.
>
> On the hard tank, you do need a water inlet/outlet valve, an air vent valve
> and a HP air valve to blow the water out when you have to. I didn't put a
> pressure gauge on mine to monitor tank pressure, but I'll probably add one
> sometime.
>
> Dan H.
>
> ----- Original Message -----
> From: "SIMON WALKDEN" <mrsym0r@gmail.com>
> To: <personal_submersibles@psubs.org>
> Sent: Saturday, July 02, 2005 4:39 PM
> Subject: [PSUBS-MAILIST] ballast valve
>
>
> > Hi again,
> >
> > I've been thinking about how a simple valve could be used to vent a
> > ballast, and i'm a bit stuck for ideas. The way I understand it is
> > this:
> >
> > WHEN OPEN FOR FLOODING : a vent opens on the bottom side to allow
> > water in, a vent opens on the top to allow escaping air out, and
> > ballast air is not pumped in.
> >
> > WHEN IN NORMAL STATE (NOT FLOODING OR EMPTYING) : the top and bottom
> > vents are closed, ballast air is not being pumped in.
> >
> > WHEN EMPTYING BALLAST : a vent opens on the bottom to allow escaping
> > water out, the top vent remains closed, ballast air is pumped in to
> > push the water out.
> >
> > So, you've got two vents that need to be opened and closed, and
> > compressed air that will at times need to be released into the ballast
> > tanks.
> >
> >
> > In this example, I've not used the K-250/K-350 design of an open
> > ballast tank, as I've read in several people's posts that they've been
> > a bit unimpressed with their ballast tanks 'burping' when travelling
> > on the surface.
> >
> > Has anybody had any thoughts about this in the past?
> >
> > -Simon
> >
> >
> >
> >
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