<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div><span>Alan,</span></div><div><span>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>Hank</div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font size="2" face="Arial"> On Thursday, June 23, 2016 5:18 AM, Alan James via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv8319883599"><div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"><div id="yiv8319883599yui_3_16_0_ym19_1_1466679037180_2838"> James,</div><div id="yiv8319883599yui_3_16_0_ym19_1_1466679037180_2837" dir="ltr">I have attached a solenoid valve design based on Vance's pneumatically</div><div id="yiv8319883599yui_3_16_0_ym19_1_1466679037180_2853" dir="ltr">operated top hat ballast valve. It was done quickly & is open comment & being evolved.</div><div id="yiv8319883599yui_3_16_0_ym19_1_1466679037180_2854" dir="ltr"> A solenoid is just a coil of wire with an iron core plunger. As long as the solenoid</div><div id="yiv8319883599yui_3_16_0_ym19_1_1466679037180_2880" dir="ltr">& plunger are coated with epoxy or similar this simple design should work.</div><div id="yiv8319883599yui_3_16_0_ym19_1_1466679037180_3043" dir="ltr">The solenoid is clamped in place by the two circular plates & the retaining bolts.</div><div id="yiv8319883599yui_3_16_0_ym19_1_1466679037180_3037" dir="ltr">(didn't put thread on the bolts) The neoprene gasket seals on it's seat by the springs</div><div id="yiv8319883599yui_3_16_0_ym19_1_1466679037180_2999" dir="ltr">pressure & air pressure in the ballast tanks. when power is on the solenoid it</div><div id="yiv8319883599yui_3_16_0_ym19_1_1466679037180_2972" dir="ltr">draws the plunger in to it, which pulls the gasket seal open.</div><div id="yiv8319883599yui_3_16_0_ym19_1_1466679037180_2971" dir="ltr">A solenoid is easy to make but it may take some experimentation to get the </div><div id="yiv8319883599yui_3_16_0_ym19_1_1466679037180_2957" dir="ltr">right gauge of wire & number of windings, so that it opens the valve but doesn't</div><div id="yiv8319883599yui_3_16_0_ym19_1_1466679037180_3005" dir="ltr">heat up excessively.</div><div id="yiv8319883599yui_3_16_0_ym19_1_1466679037180_2987" dir="ltr">The other neoprene gaskets shown are for sealing to the hull.</div><div id="yiv8319883599yui_3_16_0_ym19_1_1466679037180_3030" dir="ltr">Some sought of gauze needs placing round it to stop foreign matter getting</div><div id="yiv8319883599yui_3_16_0_ym19_1_1466679037180_3036" dir="ltr">in the valve seat. </div><div id="yiv8319883599yui_3_16_0_ym19_1_1466679037180_3006" dir="ltr">Alan</div><div id="yiv8319883599yui_3_16_0_ym19_1_1466679037180_2988" dir="ltr"><br></div></div></div></div><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br><br><br></div> </div> </div> </div></div></body></html>