<html><head></head><body><p dir="ltr">I would look at air actuated valves, so that you avoid subjecting any electronics to submergence, and then if you want automation, use 24 VDC solenoids inside the pressure hull to switch the air signals, along with a manual bypass on each pilot line for SHTF control.</p>
<p dir="ltr">Sean<br>
</p>
<br><br><div class="gmail_quote">On April 15, 2017 8:38:12 AM MDT, hank pronk via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px"><div id="yui_3_16_0_ym19_1_1492266198416_2844"><span>Alec,</span></div><div id="yui_3_16_0_ym19_1_1492266198416_2844" dir="ltr"><span>If you want simple, look at electric solenoid valves for venting the tanks. You can buy 8 valves for 100 dollars. You can plumb the tanks together to create 4 zones or you can install one valve directly to each tank (12) The beauty of using more valves is </span>safety. If one fails, no big issue. You can wire 3 valves together so only need a 5 wire penetrator. The nice thing about this idea is it is cheap to experiment with and no modification to the tanks or sub. </div><div id="yui_3_16_0_ym19_1_1492266198416_2844" dir="ltr">you will need check valves on the air feed lines so the tanks are not connected. No point in venting one zone if it can send or receive air
to another zone. </div><div id="yui_3_16_0_ym19_1_1492266198416_2844" dir="ltr">If you are reluctant to use unprotected valves in fresh water, I can say the ones we used on our log salvage ROV never once gave us a problem in two years of operation. I am talking many thousands of dives, actually one dive every 7 minutes. </div><div id="yui_3_16_0_ym19_1_1492266198416_2844" dir="ltr">If your in salt water then you may want to go with an electric valve bank with four valves where the valve bank is in an oil tank with a bladder mounted behind the CT. That is how my hydraulic valve works for my new manipulator. It is fast and easy to set up, and is what I will do for Elementary. In the mean time you can use cheap valves to figure it all out. Your entire fix (experiment) can be under 200 dollars, then go to oil bath solenoids.</div><div id="yui_3_16_0_ym19_1_1492266198416_2844" dir="ltr">Hank</div> <div class="qtdSeparateBR"><br /><br
/></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 13px;"> <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 Saturday, April 15, 2017 6:12 AM, Alec Smyth via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br /></font></div> <br /><br /> <div class="y_msg_container"><div id="yiv0394213950"><div dir="ltr">Hi all,<div><br /></div><div>I'm mulling over options for re-plumbing Shackleton's MBTs. I can go with re-positioned tubing or remotely actuated valves. In principle the tubing is easier, but I'm trying to think through all possibilities before deciding, and just thought of a new option. There's six tanks per side, and the tanks are small so it would be a challenge to put a mushroom valve inside each tank. Besides, that would be a dozen
valves. However, I could also do just two valves per side, mounted outside and above the tanks, with very short hoses or tubes leading from three tanks to each valve. There is space, and because the valves would be outside the tanks I have a lot more freedom for the size or geometry of the valves. Maybe even normal ball valves actuated by a little air cylinder. This system would allow for fore-aft and side-to-side control, and would be highly resistant to list-induced water blocking. </div><div><br /></div><div>Anyone have thoughts on the KISSest way to control valves? For example, something that could work with unregulated 3K psi air?</div><div><br /></div><div><br /></div><div>Thanks,</div><div><br />Alec</div><div><br /></div><div><br /></div></div></div>_______________________________________________<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><p style="margin-top: 2.5em; margin-bottom: 1em; border-bottom: 1px solid #000"></p><pre class="k9mail"><hr /><br />Personal_Submersibles mailing list<br />Personal_Submersibles@psubs.org<br /><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br /></pre></blockquote></div></body></html>