[PSUBS-MAILIST] Closed view

[Alan via Personal_Submersibles]

Jon,
my ballast valve will pull down & open against spring pressure. So they have spring
pressure plus air pressure from the ballast floatation keeping them closed.
If one failed you couldn't dive unless you got a diver to force it open.
 No there wouldn't be anything off the shelf in the way of a solenoid that would
work. But they are as simple as you can get, just insulated wire wrapped around 
an iron or metal tube with an iron plunger inside. A matter of coating everything
in marine epoxy. You can make it as powerful as you want, but they draw a lot
of amps.
I like the drill idea. Easy to wire it so you can reverse it remotely.
I am planning to use "Blue Robotics" open underwater motors for a few
applications.
Alan

> On 23/12/2018, at 4:20 AM, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> 
> I investigated the solenoid route as well and didn't find a lot of choices that I thought would work well.  I am looking at electric motor instead.  The biggest issue with electric is the possibility of the valve being left in open position due to motor burnout or some other electric failure.  
> 
> Jon
> 
> 
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
> Sent: Friday, December 21, 2018 8:56 PM
> Subject: Re: [PSUBS-MAILIST] Closed view
> 
> Jon,
> I have bought a couple of solenoids 48V & 24V (not solenoid valves) that I 
> intend to experiment with. The idea being that I coat the wiring, housing &
> plunger in resin & use it to directly actuate the ballast valve.
> I bought the two below to get a rough idea of what gauge wire to use, how
> large, what size plunger etc.
> There is a limit as to how long you can operate them for due to heat, but a
> ballast valve isn't open for long.
> Alan
> 
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