[PSUBS-MAILIST] Solenoid valve

[Alan via Personal_Submersibles]

Hank,
I thought of putting bellows around the plunger & oil filling the solenoid,
but I would need another set of bellows or something to compensate
for the displaced oil when the plunger retracted.
I Googled to try & find a suitable off the shelf valve but couldn't find anything.
This design should be fine. It will be corrosion proof  & work at any depth. 
I am not sure I like the retaining system of the solenoid & might look around for 
something off the shelf I can adapt.
Alan

Sent from my iPad

> On 23/06/2016, at 11:26 pm, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> Perhaps an oil filled enclosure could be built around the valve.  I have never potted anything on one of these valves, they go strait from the box to the sub (ROV).
> Hank
> 
> 
> On Thursday, June 23, 2016 5:18 AM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> James,
> I have attached a solenoid valve design based on Vance's  pneumatically
> operated top hat ballast valve. It was done quickly & is open comment & being evolved.
>    A solenoid is just a coil of wire with an iron core plunger. As long as the solenoid
> & plunger are coated with epoxy or similar this simple design should work.
> The solenoid is clamped in place by the two circular plates & the retaining bolts.
> (didn't put thread on the bolts) The neoprene gasket seals on it's seat by the springs
> pressure & air pressure in the ballast tanks. when power is on the solenoid it
> draws the plunger in to it, which pulls the gasket seal open.
> A solenoid is easy to make but it may take some experimentation to get the
> right gauge of wire & number of windings, so that it opens the valve but doesn't
> heat up excessively.
> The other neoprene gaskets shown are for sealing to the hull.
> Some sought of gauze needs placing round it to stop foreign matter getting
> in the valve seat.
> Alan
> 
> 
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