<div dir="ltr">another job I have with the OP valve is to put a rubber knob on the end of the plunger. The amount of times ive cracked my head on it........</div><div class="gmail_extra"><br><div class="gmail_quote">On 15 January 2015 at 01:56, hank pronk 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"><br>
Brian,<br>
Alec is right on the money, keep track of your pressure. Even with an over pressure valve there is pressure pushing on the hatch because the of the area of the oring in the valve.<br>
Hank --------------------------------------------<br>
<span>On Wed, 1/14/15, Private via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br>
<br>
Subject: Re: [PSUBS-MAILIST] Snorkel<br>
To: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
</span> Received: Wednesday, January 14, 2015, 7:58 PM<br>
<div><div class="h5"><br>
Pretty<br>
much the same as Emile's. I made a disk with lots of<br>
holes in it and a spring- loaded cap on the outside. A wing<br>
nut inside the sub allows you to adjust the cracking<br>
pressure, and "manual override" means pressing on<br>
the stem to make the cap on the outside unseat. We're<br>
talking just a few hours work to make one of these, it's<br>
really simple.<br>
For<br>
those who might not have Kittredge's book, there's a<br>
story in there that is relevant. Kittredge had been tooling<br>
around for a while on the bottom and there was a very slight<br>
air leak in the cabin that he was unaware of. He was about<br>
to break surface when there was a big womp and next thing he<br>
found himself outside the sub swimming, and the sub on the<br>
bottom. The K250 dome had blown out and he'd gone<br>
through behind it. It was his only accident. Bottom line...<br>
Always have an OP valve and a means of monitoring cabin<br>
pressure.<br>
Best,<br>
Alec<br>
<br>
<br>
<br>
On Jan 14,<br>
2015, at 7:25 PM, Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
wrote:<br>
<br>
Alec , what is your over<br>
pressure valve? Brian<br>
<br>
--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br>
wrote:<br>
<br>
From: Private via<br>
Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
To: Personal Submersibles General Discussion<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
Subject: Re: [PSUBS-MAILIST] Snorkel<br>
Date: Wed, 14 Jan 2015 19:02:45 -0500<br>
<br>
Hi<br>
Sean,<br>
It's<br>
extremely easy to relieve negative pressure... You just<br>
press the plunger and can do it with one finger. I do this<br>
almost every time before opening the hatch, as a small<br>
negative pressure is SOP.<br>
Best,<br>
Alec<br>
<br>
<br>
<br>
On Jan 14, 2015, at 6:57 PM, Sean T Stevenson<br>
via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
wrote:<br>
<br>
Is it<br>
always possible to manually actuate the valve if you have a<br>
negative differential pressure? I always presumed that a<br>
ball or needle valve would be necessary to equalize pressure<br>
on either side of a hatch before opening, because such a<br>
valve accommodates pressure differences in either<br>
direction. With the overpressure valve, in such a<br>
situation you need to overcome this difference in addition<br>
to the spring preload. That, or I guess you could just bleed<br>
some air or oxygen into the cabin.<br>
Sean<br>
<br>
<br>
<br>
<br>
On January 14,<br>
2015 12:36:36 PM MST, Alan James via Personal_Submersibles<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
wrote:<br>
</div></div> Brian,I seem to remember you can manually operate<br>
<span> Emile'soverpressure<br>
valve; and it is operating procedure to<br>
</span> pressit to relieve the<br>
<span> remaining pressure before opening the<br>
</span> hatch.If you are looking<br>
<span class="im HOEnZb"> for an off the shelf solution, make sureyou can do that.Alan<br>
<br>
</span><div class="HOEnZb"><div class="h5"> From: Brian Cox via<br>
Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
To: Personal<br>
Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
<br>
Sent: Thursday, January<br>
15, 2015 6:11 AM<br>
Subject: Re:<br>
[PSUBS-MAILIST] Snorkel<br>
<br>
I don't see where they<br>
list the pressure limit on<br>
it. Brian<br>
<br>
--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br>
wrote:<br>
<br>
From: James<br>
Frankland via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
To: Personal Submersibles General Discussion<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
Subject: Re: [PSUBS-MAILIST] Snorkel<br>
Date: Wed, 14 Jan 2015 16:31:56 +0000<br>
<br>
what<br>
about something like<br>
this? I only just googled it so would need research. <br>
Don't quote me on it! <a href="http://www.haitima.com.tw/valve/check-valve/check-valve-2026.htm" target="_blank">http://www.haitima.com.tw/valve/check-valve/check-valve-2026.htm</a><br>
On 14 January 2015 at 15:55, Brian Cox via<br>
Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
wrote:<br>
<br>
<br>
Is there an off the shelf<br>
over pressure valve that I can<br>
get? Brian<br>
<br>
--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br>
wrote:<br>
<br>
From: James<br>
Frankland via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
To: Personal Submersibles General Discussion<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
Subject: Re: [PSUBS-MAILIS!<br>
T]<br>
Snorkel<br>
Date: Wed, 14 Jan 2015 13:58:24<br>
+0000<br>
<br>
Yes, my OP valve does not have enough holes. I<br>
have a job over the winter to add more or drill existing<br>
holes bigger. <br>
On 14<br>
January 2015 at 13:04, Emile van Essen via<br>
Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
wrote:<br>
Mark,<br>
All.<br>
<br>
<br>
<br>
Mind the area is big enough. The valve in the attachment is<br>
designed for a<br>
<br>
3000 Kg sub. But even then it is to small if you surface too<br>
quick in case<br>
<br>
of massive overpressure.<br>
<br>
Cracking pressure: 25-75 mBar.<br>
<br>
<br>
<br>
<br>
<br>
Best regards, Emile<br>
<br>
<br>
<br>
-----Oorspronkelijk bericht-----<br>
<br>
Van: Personal_Submersibles [mailto:<a href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>]<br>
<br>
Namens Mark via Personal_Submersibles<br>
<br>
Verzonden: dinsdag 13 januari 2015 13:12<br>
<br>
Aan: Personal Submersibles General Discussion<br>
<br>
Onderwerp: Re: [PSUBS-MAILIST] Snorkel<br>
<br>
<br>
<br>
Since we are discussing over-pressure valves, can you<br>
recommend a make and<br>
<br>
model, or describe its specifications?<br>
<br>
<br>
<br>
Regards,<br>
<br>
<br>
<br>
Mark...<br>
<br>
<br>
<br>
Sent from iPhone.<br>
<br>
<br>
<br>
> On Jan 12, 2015, at 7:06 PM, Pete Niedermayr via<br>
Personal_Submersibles<br>
<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
wrote:<br>
<br>
><br>
<br>
> Scott, I see you have an overpressure valve in place of<br>
the snorkel .<br>
<br>
Whats that on the other side ?<br>
<br>
><br>
<br>
> Pete ?<br>
<br>
> --------------------------------------------<br>
<br>
> On Mon, 1/12/15, via Personal_Submersibles<br>
<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
wrote:<br>
<br>
><br>
<br>
> Subject: Re: [PSUBS-MAILIST] Snorkel<br>
<br>
> To: "Personal Submersibles General<br>
Discussion"<br>
<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
<br>
> Date: Monday, January 12, 2015, 5:09 PM<br>
<br>
><br>
<br>
> I<br>
<br>
> would recommend a cabin overpressure valve instead. It<br>
is a<br>
<br>
> mushroom valve. You can see pics on my sub page.<br>
Alec<br>
<br>
> did the same thing.<br>
<br>
><br>
<br>
> Thanks,<br>
<br>
> Scott Waters<br>
<br>
><br>
<br>
><br>
<br>
> -------- Original<br>
<br>
> Message --------<br>
<br>
> Subject: [PSUBS-MAILIST] Snorkel<br>
<br>
> From: Pete Niedermayr via Personal_Submersibles<br>
<br>
> <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
<br>
> Date: Mon, January 12, 2015 3:58 pm<br>
<br>
> To: <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br>
<br>
><br>
<br>
> I have a set of K 350 plans that I'm using as a<br>
<br>
> reference for my own design. I'm using the conning<br>
tower<br>
<br>
> plans pretty much as per. The question I do have is.<br>
Snorkel<br>
<br>
> or no snorkel ? On the one hand I can see how it would<br>
be<br>
<br>
> useful have. On the other hand no other design seems to<br>
have<br>
<br>
> one. What are your opinions? Snorkel or no snorkel?<br>
<br>
><br>
<br>
> Pete<br>
<br>
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</div></div></blockquote></div><br></div>