[PSUBS-MAILIST] solenoid valves

[David Colombo via Personal_Submersibles]

Hi Hank,
Did you use Brass or Stainless Steel?

On Tue, Apr 16, 2019, 7:33 AM hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alec,
> I am sure I have mentioned it before, but, I used solenoid valves on my
> log salvage ROV that dove 200 feet deep every 7 minutes for months on end.
> Not one single failure.
> Hank
>
> On Tuesday, April 16, 2019, 4:45:46 AM MDT, Alec Smyth via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Ah, I didn't realize that was on the other sub! Yes, you're right about
> the simplicity of electrical. But pneumatic tends to be MUCH less failure
> prone in my opinion. Bottom line, both work.
>
> On Tue, Apr 16, 2019 at 5:19 AM hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Alec,
> The pneumatic valves are on E3000, so your memory is intact.  ;-)   I am
> experimenting with the solenoids mostly and you were correct about an air
> lock in the lines.  Now I have to decide if I want to enclose the electric
> valves or put pneumatic valves in.  Turns out I only need two.  The thing I
> don't like about the pneumatic valves is all the darn plumbing and
> regulating and valving.  Electric is so simple once a nice oil filled
> housing is built.
> Hank
>
> On Monday, April 15, 2019, 7:39:34 PM MDT, Alec Smyth via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi Hank,
>
> Great the new valves work so well. I recall you posting photos of a new
> valve during the winter, but unless my memory is playing tricks on me
> (which it does) I recall a small pneumatic ram, not a solenoid. Did you
> change that or am I wrong?
>
> Best,
> Alec
>
> On Mon, Apr 15, 2019 at 4:36 PM hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi All,
> When we were in Lake Tahoe, Alec asked if I get an air lock in my MBT vent
> lines.  I said no, but that got me thinking, and I may not have realized
> that I was getting a air lock.  Normally I dive Gamma heavy with no issues
> but  at Lake Tahoe I was diving very close to neutral.  The problem I was
> having at Lake Tahoe, was the sub leaning uncomfortable while submerging.
> I blame that on the weight of the sub and since the sub was light it could
> not push the water out of the vent lines casing a blockage.  I like diving
> closer to neutral now so I installed 4 solenoid vent valves as an
> experiment.  It has solved the problem completely.  In fact I only need two
> valves to make it sink perfectly now.  With all four valves open plus the
> two original valves open, the sub dives in 1 min and 30 seconds.  Slow
> compared to Alec's sub but good for Gamma.
>
> My next challenge is to install a bigger port in E3000.  First I am
> planning a proper poured concrete test pool in my new shop.  Then I will
> dive E3000 a couple million times in the pool.  Then I can work on a larger
> port assembly.
> Hank
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