[PSUBS-MAILIST] Alec's new valves

Mon Oct 29 08:49:26 EDT 2018

Hank,
part of the idea behind this is that being a 1 person sub I want to make
it super simple for anybody else to dive. I will make the ballast switch a momentary
switch so pilots can't leave it on by mistake & burn out my solenoid valves.
As for the reliability of the electronics; I was thinking of using 3 tilt switches
& having the program only take note of the 2 switches with the closest values
to each other, & also alerting the user if the third unit is out of a certain range
compared to the other 2. I will do similar with the O2 & CO2 systems.
I could additionally have switches wired direct to the solenoid valves over-riding
the arduino unit.
As per GL philosophy, no single component failure should be able to result
in a life threatening event.
Alan

> On 30/10/2018, at 12:21 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> I have to admit, that is pretty tempting.  I am torn between having a nice feature and my HATRED for electronics in a sub.  At Lake Tahoe, the only issues with Gamma  were ELECTRONIC, yes even Gamma with minimal electronics  had a failed potentiometer on the speed control.  Luckily, because I HATE and distrust all things electronic I carry a spare everything.  Are you not afraid if you make the sub so easy to operate that you take the joy out of diving it. 
> Hank
> 
> On Sunday, October 28, 2018, 10:38:27 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Hank,
> you'll really get excited over this! I have purchased a $10- arduino
> compatible tilt sensor / accelerometer to control my ballast solenoids.
> The idea is that to dive you flick one switch on the consul, this connects
> to the arduino board & via relays opens the ballast solenoid valves.
> If the sub starts to descend unevenly the arduino will read this from the 
> tilt sensor & turn off the appropriate ballast valve untill the subs descent
> becomes level. 
> Probably a bit of fine tuning in the field required.
> In the photo below I am only showing one relay as an example but will 
> need to source relays based on my currently unknown power requirements.
> That is basically it, apart from the wiring.
> Cheers Alan
> <image1.JPG>
> 
>> On 29/10/2018, at 10:42 AM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
> 
> Hank,
> I would be interested in seeing them when they are finished.
> Attached is one of my preliminary designs, but will probably
> make the Aluminium housing a tight fit around the wires as 
> a heat sink. Being vent valves they won't get water cooled till 
> the ballast tanks are flooded.
> Alan
>  <image1.JPG>
> 
>> On 29/10/2018, at 10:14 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> Alan,
>> I am making solenoid vent valves and immersing the entire valve in oil with a compensation bladder.  I used them on my salvage ROV that did thousands of cycles without anything done to them.  I need two on Gamma and two on E3000
>> Hank
>> 
>> On Sunday, October 28, 2018, 1:57:10 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> 
>> Hank,
>> I would need to put a seal on the plunger & as the plunger goes
>> in & out it would be displacing oil, so have the same problems as with
>> linear actuators. As the plunger has to be a material that can be
>> magnetised it is vulnerable to corrosion, so I will have to coat it in
>> resin anyway. It is just a matter of putting the plunger on the lathe
>> & taking off enough metal to make room for the resin. 
>> I made a solenoid valve years ago. It was 60W & got hot really fast.
>> I have ordered a 48V & 24V solenoid mainly to see how hot they
>> get, how strong they are, what gauge wire they are using & how many
>> turns. If neither is suitable at least I will get some ideas for building one.
>> I have been inspired by those little open waterproofed motors I bought.
>> What were you going to use the solenoids for? If you want I will keep
>> you up to date with what I am doing, but the solenoids will take about
>> 2 weeks to get here.
>> Alan
>> 
>> 
>>> On 29/10/2018, at 8:29 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>> 
>>> Alan,
>>> Why don't you just make a housing for the solenoids and oil fill.  That is one of my first projects when I get back to the sub.
>>> Hank
>>> 
>>> On Sunday, October 28, 2018, 12:46:29 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>> 
>>> 
>>> Hank,
>>> yes just making fun of you! It's an old English saying! 
>>> Thanks Alec, I see I have already "liked" them. Nice piece of work.
>>> You guys got me inspired & I ordered a couple of solenoids to modify Vance's
>>> mushroom valve design & make it electric. I will have to waterproof the solenoids,
>>> which will involve machining the plunger so I can coat it & it's iron tube
>>> receptacle with resin.
>>> The force varies depending on how far out the plunger is & on one I
>>> ordered it varied between 1 & 10kg; unfortunately I'll get a reduction in force
>>> after coating everything with resin. I am not sure how much spring force I should 
>>> need to close it yet.
>>> Alan
>>> 
>>> 
>>> 
>>>  
>>> 
>>>> On 29/10/2018, at 6:49 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>> 
>>>> Have you guys never heard the saying "on pins and needles"  or are you just making fun of me 
>>>> Hank
>>>> 
>>>> On Sunday, October 28, 2018, 8:33:01 AM MDT, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>> 
>>>> 
>>>> Yeah, I'm not sure what Hank was talking about concerning piss and needles, it doesn't sound good at all. But Alan, scroll down on this page and you'll see the valves...
>>>> 
>>>> https://www.facebook.com/pg/INNERSPACESCIENCE/posts/
>>>> 
>>>> 
>>>> On Sat, Oct 27, 2018 at 10:29 PM Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>> Hank,
>>>> glad you clarified that, it read like you were an alcoholic & junky.
>>>> What valves were they? I haven't received any posts lately &
>>>> were wondering if I had missed some.
>>>> Alan 
>>>>  
>>>> 
>>>>> On 28/10/2018, at 1:20 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>>> 
>>>>> Pins
>>>>> 
>>>>> 
>>>>> On Saturday, October 27, 2018, 6:19:32 PM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>>> 
>>>>> 
>>>>> Alec,
>>>>> I am on pis and needles waiting to hear about your new valves and how they perform.  Have you tested them?
>>>>> Hank
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