<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>No. Failure mode is I won't be able to dive. If you were desperate you could unbolt</div><div>the bottom valves & get a diver to depress the top valves. If the wiring thickness &</div><div>windings are calculated with a large margin of error against burning out,</div><div>& the wire is protected against breakage, it should be pretty reliable. My ambient</div><div>has solenoid valves, but they were modified commercial valves that could corrode.</div><div>This gives you the liberty of operating the valves from a portable module.</div><div>Not shown in the drawing is a wire gauss that will stop the ingress of rubbish.</div><div>Alan </div><div><br><br>Sent from my iPad</div><div><br>On 18/10/2016, at 9:18 pm, Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="font-family:Arial, sans-serif; font-size:10pt;"><div>Alan, Will you have a mechanical valve for back up ?</div><div> </div><div>Brian<br><br>--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:<br><br>From: Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>Subject: [PSUBS-MAILIST] SOLENOID BALLAST VALVE<br>Date: Tue, 18 Oct 2016 07:43:50 +0000 (UTC)<br><br></div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);"><div>I have been working on my ballast valve design. (below)</div><div dir="ltr">It's based on the drawing Vance handed out at the Islamorada convention, </div><div dir="ltr">except it's operated by a solenoid rather than an air cylinder.</div><div dir="ltr">I am intending to have a similar valve on the bottom of my ballast tank,</div><div dir="ltr">but modified so that the sealing gasket sits on the outside of the top plate</div><div dir="ltr">& pushes away. </div><div dir="ltr">I will be able to use the same wire on the top valve on the coil of the bottom</div><div dir="ltr">valve so they work in unison. Just a matter of getting the right thickness</div><div dir="ltr">of wire & number of turns. </div><div dir="ltr">If it fails you won't be able to release air to dive, but will always be able to</div><div dir="ltr">fill the tanks with air.</div><div dir="ltr">The iron core of the plunger will need to be coated. The wiring of the solenoid</div><div dir="ltr">is already coated but I'll add a bit of epoxy.</div><div dir="ltr">The intended assembly method is to cut a whole in the top of the ballast tank</div><div dir="ltr">& drop the module in. Then use the bolt holes in the top plate as a template</div><div dir="ltr">for holes through the ballast tank. The ballast tank holes are then oversized</div><div dir="ltr">to receive threaded inserts that are epoxied in from the inside. Then the valve</div><div dir="ltr">is dropped in & bolted down.</div><div dir="ltr">I am thinking of doing it all in hard anodized aluminum but are not quite sure.</div><div dir="ltr">I am intending to weld the body to the top plate.</div><div dir="ltr">Any thoughts???</div><div dir="ltr">Alan <br></div></div>_______________________________________________
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