[PSUBS-MAILIST] Solenoid valve

[James Frankland via Personal_Submersibles]

Thanks Alan.  Looks interesting.  I am still considering this option.  Want
to crack on with my batteries, but have to go to London this weekend.  grrrr

On 23 June 2016 at 12:49, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> 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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