[PSUBS-MAILIST] actuated valves?

Sat Apr 15 11:05:10 EDT 2017

Thanks Hank. I'm definitely building for salt water. A small cheap solenoid
valve on each tank sounds attractive, but I'd need to figure out a way to
encase these valves in oil, or even better an air compensated enclosure -
ugh! How about something like this? There are much cheaper ones. There
would be four zones.

http://www.omega.com/pptst/AAV-1100.html

On Sat, Apr 15, 2017 at 10:43 AM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alec,
> Try eBay,  "air ride suspension solenoid valves"  you will see a set of 8
> for 98 dollars or so.
> Hank
>
>
> On Saturday, April 15, 2017 8:41 AM, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Alec,
> If you want simple, look at electric solenoid valves for venting the
> tanks.  You can buy 8 valves for 100 dollars.  You can plumb the tanks
> together to create 4 zones or you can install one valve directly to each
> tank (12)   The beauty of using more valves is safety.  If one fails, no
> big issue.  You can wire 3 valves together so only need a 5 wire
> penetrator.  The nice thing about this idea is it is cheap to experiment
> with and no modification to the tanks or sub.
> you will need check valves on the air feed lines so the tanks are not
> connected.  No point in venting one zone if it can send or receive air to
> another zone.
> If you are reluctant to use unprotected valves in fresh water, I can say
> the ones we used on our log salvage ROV never once gave us a problem in two
> years of operation.  I am talking many thousands of dives, actually one
> dive every 7 minutes.
> If your in salt water then you may want to go with an electric valve bank
> with four valves where the valve bank is in an oil tank with a bladder
> mounted behind the CT.   That is how my hydraulic valve works for my new
> manipulator.  It is fast and easy to set up, and is what I will do for
> Elementary.  In the mean time you can use cheap valves to figure it all
> out.  Your entire fix (experiment) can be under 200 dollars, then go to oil
> bath solenoids.
> Hank
>
>
> On Saturday, April 15, 2017 6:12 AM, Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Hi all,
>
> I'm mulling over options for re-plumbing Shackleton's MBTs. I can go with
> re-positioned tubing or remotely actuated valves. In principle the tubing
> is easier, but I'm trying to think through all possibilities before
> deciding, and just thought of a new option. There's six tanks per side, and
> the tanks are small so it would be a challenge to put a mushroom valve
> inside each tank. Besides, that would be a dozen valves. However, I could
> also do just two valves per side, mounted outside and above the tanks, with
> very short hoses or tubes leading from three tanks to each valve. There is
> space, and because the valves would be outside the tanks I have a lot more
> freedom for the size or geometry of the valves. Maybe even normal ball
> valves actuated by a little air cylinder. This system would allow for
> fore-aft and side-to-side control, and would be highly resistant to
> list-induced water blocking.
>
> Anyone have thoughts on the KISSest way to control valves? For example,
> something that could work with unregulated 3K psi air?
>
>
> Thanks,
>
> Alec
>
>
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