[PSUBS-MAILIST] solenoid valves

[Alan via Personal_Submersibles]

Hi Hank,
I water proofed the solenoid & electrical sections but the problem
was a small orifice that re-routed some of the water around a diaphragm in the
Valve mechanism, even though this wasn't a pressure assisted solenoid valve.
I remember Hugh looking at this option in detail, & I don't think he found a 
suitable off the shelf option.
As you say, we will be mainly diving in salt water & need something more robust.
Alan



> On 16/04/2019, at 10:19 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> If I were in salt water I would worry about corrosion also, but in fresh water they are fine.  Having said that, I will make an oil filled enclosure.  There is not a serious risk if a valve failed.  Gamma can surface with the drop weight and the escape pod bladder.
> Hank
> 
> On Monday, April 15, 2019, 3:28:25 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Hank,
> I have solenoid valves in my ambient & they worked really well.
> I controlled them off a PlayStation 2 controller.
> Mine were designed for air & were a quick solution at the time.
> I have pulled a few apart & the internal parts are susceptible to 
> Corrosion. A diaphragm spring comes to mind.
> Yours may be different. I have designed a home made version 
> that I am hoping will be more robust.
> Alan
> 
>> On 16/04/2019, at 8:35 AM, 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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