<div dir="ltr">Yes, it needs a valve because its going through your pressure hull. But it can be a check valve, no need to be manually operated.<div><br></div><div>Alec</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Aug 21, 2015 at 11:28 PM, Brian Cox via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="font-family:Arial,sans-serif;font-size:10pt"><div>Hi All,</div><div>                Question,  does outward bound high pressure (ie to the ballast tank) need to have a valve on it before it goes out through the hull?  It wouldn't seem so, but I was just wondering if there is some ABS rule concerning that.</div><span class="HOEnZb"><font color="#888888"><div> </div><div>Brian</div></font></span></div>
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