<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1466716935820_4617" dir="ltr"><span id="yui_3_16_0_ym19_1_1466716935820_4618">Sean, Jon.</span></div><div id="yui_3_16_0_ym19_1_1466716935820_4619" dir="ltr"><span id="yui_3_16_0_ym19_1_1466716935820_4620">that is similar to Vance's design, using an air cylinder to actuate the ballast valve,</span></div><div id="yui_3_16_0_ym19_1_1466716935820_4621" dir="ltr"><span id="yui_3_16_0_ym19_1_1466716935820_4622">however you have added a solenoid valve in the system so that it can be controlled electronically.</span></div><div id="yui_3_16_0_ym19_1_1466716935820_4623" dir="ltr"><span id="yui_3_16_0_ym19_1_1466716935820_4624">That requires the addition of an extra piece of hardware. </span></div><div id="yui_3_16_0_ym19_1_1466716935820_4831" dir="ltr"><span id="yui_3_16_0_ym19_1_1466716935820_4832">You could start with something like this air core solenoid (below) or just wrap wire from an old</span></div><div id="yui_3_16_0_ym19_1_1466716935820_5164" dir="ltr"><span id="yui_3_16_0_ym19_1_1466716935820_5165">transformer round a plastic tube. Then dunk it in resin, however </span><span id="yui_3_16_0_ym19_1_1466716935820_4873">the wires are insulated anyway </span></div><div id="yui_3_16_0_ym19_1_1466716935820_5172" dir="ltr"><span id="yui_3_16_0_ym19_1_1466716935820_5171">so it would be a matter of concentrating on potting </span><span id="yui_3_16_0_ym19_1_1466716935820_4929">the terminations. Then get an undersized iron </span></div><div id="yui_3_16_0_ym19_1_1466716935820_5177" dir="ltr"><span>rod so it has a sloppy fit, & dunk that in resin.</span></div><div id="yui_3_16_0_ym19_1_1466716935820_4932" dir="ltr"><span id="yui_3_16_0_ym19_1_1466716935820_4931">The rod is only moving inside the coil a couple of times every dive, so friction & wear</span></div><div id="yui_3_16_0_ym19_1_1466716935820_4933" dir="ltr"><span id="yui_3_16_0_ym19_1_1466716935820_4935">won't be an issue. You would only need to design it bigger to get the strength you needed,</span></div><div id="yui_3_16_0_ym19_1_1466716935820_5043" dir="ltr"><span id="yui_3_16_0_ym19_1_1466716935820_5042">& so that it ran cool. The power consumption would be a non issue as it is only</span></div><div id="yui_3_16_0_ym19_1_1466716935820_5033" dir="ltr"><span id="yui_3_16_0_ym19_1_1466716935820_5032">running for about 30 seconds a couple of times per dive.</span></div><div id="yui_3_16_0_ym19_1_1466716935820_5041" dir="ltr"><span id="yui_3_16_0_ym19_1_1466716935820_5040">I made a solenoid valve from an old solenoid & a toilet ball valve. It worked but because</span></div><div id="yui_3_16_0_ym19_1_1466716935820_5035" dir="ltr"><span id="yui_3_16_0_ym19_1_1466716935820_5034">the solenoid was so small it did heat up quickly.</span></div><div id="yui_3_16_0_ym19_1_1466716935820_5075" dir="ltr"><span>Cheers Alan</span></div><div id="yui_3_16_0_ym19_1_1466716935820_4934" dir="ltr"><span> </span></div><div id="yui_3_16_0_ym19_1_1466716935820_4625"><img class="img-overlay-selected" id="yui_3_16_0_ym19_1_1466716935820_4626" alt="Air Core Solenoid Large" src="http://shop.sciencefirst.com/24800-large_default/air-core-solenoid-large.jpg" data-id="24293e66-c54e-94c3-17a0-fa6ce4527dd9"><br id="yui_3_16_0_ym19_1_1466716935820_4627"><br id="yui_3_16_0_ym19_1_1466716935820_4628"></div><div id="yui_3_16_0_ym19_1_1466716935820_4629"> <div id="yui_3_16_0_ym19_1_1466716935820_4630" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1466716935820_4631" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1466716935820_4632" dir="ltr"> <font id="yui_3_16_0_ym19_1_1466716935820_4633" face="Arial" size="2"> <hr size="1" id="yui_3_16_0_ym19_1_1466716935820_4634"> <b id="yui_3_16_0_ym19_1_1466716935820_4635"><span id="yui_3_16_0_ym19_1_1466716935820_4636" style="font-weight: bold;">From:</span></b> Sean T. Stevenson via Personal_Submersibles <personal_submersibles@psubs.org><br id="yui_3_16_0_ym19_1_1466716935820_4637"> <b id="yui_3_16_0_ym19_1_1466716935820_4638"><span id="yui_3_16_0_ym19_1_1466716935820_4639" style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br id="yui_3_16_0_ym19_1_1466716935820_4640"> <b id="yui_3_16_0_ym19_1_1466716935820_4641"><span id="yui_3_16_0_ym19_1_1466716935820_4642" style="font-weight: bold;">Sent:</span></b> Friday, June 24, 2016 12:52 AM<br id="yui_3_16_0_ym19_1_1466716935820_4643"> <b id="yui_3_16_0_ym19_1_1466716935820_4644"><span id="yui_3_16_0_ym19_1_1466716935820_4645" style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Solenoid valve<br id="yui_3_16_0_ym19_1_1466716935820_4646"> </font> </div> <div id="yui_3_16_0_ym19_1_1466716935820_4647"><br id="yui_3_16_0_ym19_1_1466716935820_4648"><div id="yui_3_16_0_ym19_1_1466716935820_4649"><div id="yui_3_16_0_ym19_1_1466716935820_4650"><div id="yui_3_16_0_ym19_1_1466716935820_4651" dir="ltr">I have solved similar problems by using small solenoid valves to control the application of low pressure air (<100 psi) to the exposed valve, which is air actuated. This way, all of the electronics are protected from the outside environment, easily repairable / replaceable, and can be observed for correct function. The air signal from the first valve is then what would pass through the hull, so it would have a safety shutoff at the through hull, and then the second (larger) valve is entirely mechanical in nature and made of materials compatible with the environment. I have used several different versions of this, but the solenoid valves I use most often now are Asco Red Hat Next Generation solenoid valves with 24 VDC coils, because they appear to have the least constant power draw when actuated of all the options I've tried. 1/4" is all you nee!
d for
air, unless you have a particularly huge second valve that requires a fast actuation time. I do something similar with proportional valves too, using an I/P converter (proportional regulator) to convert 4-20 mA control signals to 0-15 psi pilot air pressure which is sent to a large proportional valve which is exposed to a H2S environment.</div>
<div id="yui_3_16_0_ym19_1_1466716935820_4652" dir="ltr">Sean<br id="yui_3_16_0_ym19_1_1466716935820_4653" clear="none"><br id="yui_3_16_0_ym19_1_1466716935820_4654" clear="none"></div>
<br id="yui_3_16_0_ym19_1_1466716935820_4655" clear="none"><br id="yui_3_16_0_ym19_1_1466716935820_4656" clear="none"><div id="yui_3_16_0_ym19_1_1466716935820_4657">On June 23, 2016 5:49:13 AM MDT, Alan via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<blockquote id="yui_3_16_0_ym19_1_1466716935820_4658" style="margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;">
<div id="yui_3_16_0_ym19_1_1466716935820_4659">Hank,</div><div id="yui_3_16_0_ym19_1_1466716935820_4660">I thought of putting bellows around the plunger & oil filling the solenoid,</div><div id="yui_3_16_0_ym19_1_1466716935820_4661">but I would need another set of bellows or something to compensate</div><div id="yui_3_16_0_ym19_1_1466716935820_4662">for the displaced oil when the plunger retracted.</div><div id="yui_3_16_0_ym19_1_1466716935820_4663">I Googled to try & find a suitable off the shelf valve but couldn't find anything.</div><div id="yui_3_16_0_ym19_1_1466716935820_4664">This design should be fine. It will be corrosion proof & work at any depth. </div><div id="yui_3_16_0_ym19_1_1466716935820_4665">I am not sure I like the retaining system of the solenoid & might look around for </div><div id="yui_3_16_0_ym19_1_1466716935820_4666">something off the shelf I can adapt.</div><div id="yui_3_16_0_ym19_1_1466716935820_4667">Alan</div><div id="yui_3_16_0_ym19_1_1466716935820_4668"><br id="yui_3_16_0_ym19_1_1466716935820_4669" clear="none">Sent from my iPad</div><div id="yui_3_16_0_ym19_1_1466716935820_4670"><br id="yui_3_16_0_ym19_1_1466716935820_4671" clear="none">On 23/06/2016, at 11:26 pm, hank pronk via Personal_Submersibles <<a id="yui_3_16_0_ym19_1_1466716935820_4672" href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br id="yui_3_16_0_ym19_1_1466716935820_4673" clear="none"><br id="yui_3_16_0_ym19_1_1466716935820_4674" clear="none"></div><blockquote id="yui_3_16_0_ym19_1_1466716935820_4675" type="cite"><div id="yui_3_16_0_ym19_1_1466716935820_4676"><div id="yui_3_16_0_ym19_1_1466716935820_4677" style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);"><div id="yui_3_16_0_ym19_1_1466716935820_4678"><span id="yui_3_16_0_ym19_1_1466716935820_4679">Alan,</span></div><div id="yui_3_16_0_ym19_1_1466716935820_4680"><span id="yui_3_16_0_ym19_1_1466716935820_4681">Perhaps an </span>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).</div><div id="yui_3_16_0_ym19_1_1466716935820_4682">Hank</div> <div id="yui_3_16_0_ym19_1_1466716935820_4683"><br id="yui_3_16_0_ym19_1_1466716935820_4684" clear="none"><br id="yui_3_16_0_ym19_1_1466716935820_4685" clear="none"></div><div id="yui_3_16_0_ym19_1_1466716935820_4686" style="display: block;"> <div id="yui_3_16_0_ym19_1_1466716935820_4687" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px;"> <div id="yui_3_16_0_ym19_1_1466716935820_4688" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1466716935820_4689" dir="ltr"><font id="yui_3_16_0_ym19_1_1466716935820_4690" face="Arial" size="2"> On Thursday, June 23, 2016 5:18 AM, Alan James via Personal_Submersibles <<a id="yui_3_16_0_ym19_1_1466716935820_4691" href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br id="yui_3_16_0_ym19_1_1466716935820_4692" clear="none"></font></div> <br id="yui_3_16_0_ym19_1_1466716935820_4693" clear="none"><br id="yui_3_16_0_ym19_1_1466716935820_4694" clear="none"> <div id="yui_3_16_0_ym19_1_1466716935820_4695"><div id="yui_3_16_0_ym19_1_1466716935820_4696"><div id="yui_3_16_0_ym19_1_1466716935820_4697"><div id="yui_3_16_0_ym19_1_1466716935820_4698" style="color: rgb(0, 0, 0); font-family: HelveticaNeue, vetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);"><div id="yui_3_16_0_ym19_1_1466716935820_4699"> James,</div><div id="yui_3_16_0_ym19_1_1466716935820_4700" dir="ltr">I have attached a solenoid valve design based on Vance's pneumatically</div><div id="yui_3_16_0_ym19_1_1466716935820_4701" dir="ltr">operated top hat ballast valve. It was done quickly & is open comment & being evolved.</div><div id="yui_3_16_0_ym19_1_1466716935820_4702" dir="ltr"> A solenoid is just a coil of wire with an iron core plunger. As long as the solenoid</div><div id="yui_3_16_0_ym19_1_1466716935820_4703" dir="ltr">& plunger are coated with epoxy or similar this simple design should work.</div><div id="yui_3_16_0_ym19_1_1466716935820_4704" dir="ltr">The solenoid is clamped in place by the two circular plates & the retaining bolts.</div><div id="yui_3_16_0_ym19_1_1466716935820_4705" dir="ltr">(didn't put thread on the bolts) The neoprene gasket seals on it's seat by the springs</div><div id="yui_3_16_0_ym19_1_1466716935820_4706" dir="ltr">pressure & air pressure in the ballast tanks. when power is on the solenoid it</div><div id="yui_3_16_0_ym19_1_1466716935820_4707" dir="ltr">draws the plunger in to it, which pulls the gasket seal open.</div><div id="yui_3_16_0_ym19_1_1466716935820_4708" dir="ltr">A solenoid is easy to make but it may take some experimentation to get the </div><div id="yui_3_16_0_ym19_1_1466716935820_4709" dir="ltr">right gauge of wire & number of windings, so that it opens the valve but doesn't</div><div id="yui_3_16_0_ym19_1_1466716935820_4710" dir="ltr">heat up excessively.</div><div id="yui_3_16_0_ym19_1_1466716935820_4711" dir="ltr">The other neoprene gaskets shown are for sealing to the
hull.</div><div id="yui_3_16_0_ym19_1_1466716935820_4712" dir="ltr">Some sought of gauze needs placing round it to stop foreign matter getting</div><div id="yui_3_16_0_ym19_1_1466716935820_4713" dir="ltr">in the valve seat. </div><div id="yui_3_16_0_ym19_1_1466716935820_4714" dir="ltr">Alan</div><div id="yui_3_16_0_ym19_1_1466716935820_4715" dir="ltr"><br id="yui_3_16_0_ym19_1_1466716935820_4716" clear="none"></div></div></div></div><br id="yui_3_16_0_ym19_1_1466716935820_4717" clear="none">_______________________________________________<br id="yui_3_16_0_ym19_1_1466716935820_4718" clear="none">Personal_Submersibles mailing list<br id="yui_3_16_0_ym19_1_1466716935820_4719" clear="none"><a id="yui_3_16_0_ym19_1_1466716935820_4720" href="mailto:Personal_Submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br id="yui_3_16_0_ym19_1_1466716935820_4721" clear="none"><a id="yui_3_16_0_ym19_1_1466716935820_4722" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><div id="yui_3_16_0_ym19_1_1466716935820_4723"><br id="yui_3_16_0_ym19_1_1466716935820_4724" clear="none"><br id="yui_3_16_0_ym19_1_1466716935820_4725" clear="none"><br id="yui_3_16_0_ym19_1_1466716935820_4726" clear="none"></div></div><div id="yui_3_16_0_ym19_1_1466716935820_4727"> </div></div><div id="yui_3_16_0_ym19_1_1466716935820_4728"> </div></div><div id="yui_3_16_0_ym19_1_1466716935820_4729"> </div></div></div></div></blockquote><div id="yui_3_16_0_ym19_1_1466716935820_4730"><blockquote id="yui_3_16_0_ym19_1_1466716935820_4731" type="cite"><div id="yui_3_16_0_ym19_1_1466716935820_4732"><span id="yui_3_16_0_ym19_1_1466716935820_4733">_______________________________________________</span><br id="yui_3_16_0_ym19_1_1466716935820_4734" clear="none"><span id="yui_3_16_0_ym19_1_1466716935820_4735">Personal_Submersibles mailing list</span><br id="yui_3_16_0_ym19_1_1466716935820_4736" clear="none"><span id="yui_3_16_0_ym19_1_1466716935820_4737"><a id="yui_3_16_0_ym19_1_1466716935820_4738" href="mailto:Personal_Submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br id="yui_3_16_0_ym19_1_1466716935820_4739" clear="none"><span id="yui_3_16_0_ym19_1_1466716935820_4740"><a id="yui_3_16_0_ym19_1_1466716935820_4741" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br id="yui_3_16_0_ym19_1_1466716935820_4742" clear="none"></div></blockquote><div id="yui_3_16_0_ym19_1_1466716935820_4743" style="margin-top: 2.5em; margin-bottom: 1em; border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"></div><pre id="yui_3_16_0_ym19_1_1466716935820_4744"></pre><hr id="yui_3_16_0_ym19_1_1466716935820_4745"><br id="yui_3_16_0_ym19_1_1466716935820_4746" clear="none">Personal_Submersibles mailing list<br id="yui_3_16_0_ym19_1_1466716935820_4747" clear="none">Personal_Submersibles@psubs.org<br id="yui_3_16_0_ym19_1_1466716935820_4748" clear="none"><a id="yui_3_16_0_ym19_1_1466716935820_4749" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br id="yui_3_16_0_ym19_1_1466716935820_4750" clear="none"></div></blockquote></div></div></div><br id="yui_3_16_0_ym19_1_1466716935820_4751"><div id="yui_3_16_0_ym19_1_1466716935820_4752">_______________________________________________<br id="yui_3_16_0_ym19_1_1466716935820_4753" clear="none">Personal_Submersibles mailing list<br id="yui_3_16_0_ym19_1_1466716935820_4754" clear="none"><a id="yui_3_16_0_ym19_1_1466716935820_4755" href="mailto:Personal_Submersibles@psubs.org" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br id="yui_3_16_0_ym19_1_1466716935820_4756" clear="none"><a id="yui_3_16_0_ym19_1_1466716935820_4757" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br id="yui_3_16_0_ym19_1_1466716935820_4758" clear="none"></div><br id="yui_3_16_0_ym19_1_1466716935820_4759"><br id="yui_3_16_0_ym19_1_1466716935820_4760"></div> </div> </div> </div></div></body></html>