Simon,
Yes, I have a K-350
I think you may be complicating things. The three valve system works
well.
There are times that there is sufficient pressure in the tank to release
water without adding HP air and there are times when you can add a bit
more
water without venting the tank again. It's not necessary to vent every
time
you add water or open to the HP air system every time you want to eject
a
little bit of water. The key is, is the tank pressure more then or less
then the sea at the depth your at. Many times I only open one valve.
Dan H.
----- Original Message -----
From: "SIMON WALKDEN" <mrsym0r@gmail.com>
To: <personal_submersibles@psubs.org>
Sent: Saturday, July 02, 2005 5:29 PM
Subject: 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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