<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>Jon,</div><div>my ballast valve will pull down & open against spring pressure. So they have spring</div><div>pressure plus air pressure from the ballast floatation keeping them closed.</div><div>If one failed you couldn't dive unless you got a diver to force it open.</div><div> No there wouldn't be anything off the shelf in the way of a solenoid that would</div><div>work. But they are as simple as you can get, just insulated wire wrapped around </div><div>an iron or metal tube with an iron plunger inside. A matter of coating everything</div><div>in marine epoxy. You can make it as powerful as you want, but they draw a lot</div><div>of amps.</div><div>I like the drill idea. Easy to wire it so you can reverse it remotely.</div><div>I am planning to use "Blue Robotics" open underwater motors for a few</div><div>applications.</div><div>Alan</div><div><br>On 23/12/2018, at 4:20 AM, Jon Wallace 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="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1545445163554_25204"><span>Alan,</span></div><div id="yui_3_16_0_ym19_1_1545445163554_25204"><span><br></span></div><div id="yui_3_16_0_ym19_1_1545445163554_25204" dir="ltr"><span id="yui_3_16_0_ym19_1_1545445163554_25411">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. </span></div><div id="yui_3_16_0_ym19_1_1545445163554_25204" dir="ltr"><span><br></span></div><div id="yui_3_16_0_ym19_1_1545445163554_25204" dir="ltr"><span>Jon</span></div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1545445163554_25414"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1545445163554_25192" style="display: block;"> <div style="font-family: times new roman, new york, times, serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1545445163554_25191"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1545445163554_25190"> <div dir="ltr" id="yui_3_16_0_ym19_1_1545445163554_25189"> <font size="2" face="Arial" id="yui_3_16_0_ym19_1_1545445163554_25415"> <hr size="1" id="yui_3_16_0_ym19_1_1545445163554_25420"> <b id="yui_3_16_0_ym19_1_1545445163554_25418"><span style="font-weight:bold;" id="yui_3_16_0_ym19_1_1545445163554_25417">From:</span></b> Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br> <b><span style="font-weight: bold;">Sent:</span></b> Friday, December 21, 2018 8:56 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Closed view<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1545445163554_25193"><br><div id="yiv3893729026"><div id="yui_3_16_0_ym19_1_1545445163554_25196"><div></div><div id="yui_3_16_0_ym19_1_1545445163554_25195">Jon,</div><div id="yui_3_16_0_ym19_1_1545445163554_25198">I have bought a couple of solenoids 48V & 24V (not solenoid valves) that I </div><div id="yui_3_16_0_ym19_1_1545445163554_27407">intend to experiment with. The idea being that I coat the wiring, housing &</div><div id="yui_3_16_0_ym19_1_1545445163554_27405">plunger in resin & use it to directly actuate the ballast valve.</div><div id="yui_3_16_0_ym19_1_1545445163554_27403">I bought the two below to get a rough idea of what gauge wire to use, how</div><div>large, what size plunger etc.</div><div>There is a limit as to how long you can operate them for due to heat, but a</div><div>ballast valve isn't open for long.</div><div>Alan</div><div id="yui_3_16_0_ym19_1_1545445163554_27350"><br></div></div></div></div> </div> </div> </div></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></body></html>