[PSUBS-MAILIST] 12v solenoid vent valves in sea water

[Alan via Personal_Submersibles]

Brian,
this is what I designed. Using an off the shelf solenoid ( which I've bought).
I will need to machine down either the plunger or the bore it fits in to make room for the resin coating.
Alan

> On 8/03/2020, at 4:50 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Brian,
> I had a number of solenoid valves on my ambient sub.
> In general they come in two flavours; one uses system pressure to assist
> opening the other doesn't. Forget the nomenclature, I think one was force activating.
> The latter tend to be 24V because they need more power to open. 
> I used them as ballast valves & for venting & blowing.
> I am pretty sure I had corrosion in them. I pulled some apart prior to use & they 
> were not as simple as you would think, with little springs etc that can rust out.
> I would have a non return valve for blowing to stop water getting into the system.
> Psubber Hugh Fulton, who is a valve importer & manufacturer couldn't find
> a suitable off the shelf product for his sub. 
> I have been designing a solenoid valve based on an air activated ballast valve
> that Vance presented at a Psub conference. It has an open high powered solenoid
> coated in resin. I am not sure how hot it would get as it would pull amps like a
> stalled motor, being just a coil of wire.
> Alan
> 
> 
>> On 8/03/2020, at 3:58 PM, Brian Hughes via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> After Ian's reply thought I'd start a separate thread.
>> 
>> Hank pioneered using inexpensive 12v solenoid MBT vent valves. I'm set to go with 1" brass valves for Harold's side mounted tank swap. Could upgrade to stainless if needed, but Hank used brass ones for Gamma so starting there.
>> 
>> Wondering if anyone else has played with these yet. Haven't completely pulled one apart so don't know what might be an impact of long term use in sea water. Maybe disassemble and coat with silicon grease on a regular basis?  
>> 
>> Brian
>> 
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