[PSUBS-MAILIST] Snorkel

Wed Jan 14 19:02:45 EST 2015

Hi Sean,

It's extremely easy to relieve negative pressure... You just press the plunger and can do it with one finger. I do this almost every time before opening the hatch, as a small negative pressure is SOP.

Best,

Alec

> On Jan 14, 2015, at 6:57 PM, Sean T Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Is it always possible to manually actuate the valve if you have a negative differential pressure?  I always presumed that a ball or needle valve would be necessary to equalize pressure on either side of a hatch before opening, because such a valve accommodates pressure differences in either direction.  With the overpressure valve, in such a situation you need to overcome this difference in addition to the spring preload. That, or I guess you could just bleed some air or oxygen into the cabin.
> 
> Sean
> 
> 
>> On January 14, 2015 12:36:36 PM MST, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> Brian,
>> I seem to remember you can manually operate Emile's
>> overpressure valve; and it is operating procedure to press
>> it to relieve the remaining pressure before opening the hatch.
>> If you are looking for an off the shelf solution, make sure
>> you can do that.
>> Alan
>> 
>> From: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
>> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
>> Sent: Thursday, January 15, 2015 6:11 AM
>> Subject: Re: [PSUBS-MAILIST] Snorkel
>> 
>> I don't see where they list the pressure limit on it.
>>  
>> Brian
>> 
>> --- personal_submersibles at psubs.org wrote:
>> 
>> From: James Frankland via Personal_Submersibles <personal_submersibles at psubs.org>
>> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
>> Subject: Re: [PSUBS-MAILIST] Snorkel
>> Date: Wed, 14 Jan 2015 16:31:56 +0000
>> 
>> what about something like this?  I only just googled it so would need research.  Don't quote me on it!
>>  
>> http://www.haitima.com.tw/valve/check-valve/check-valve-2026.htm
>> 
>> On 14 January 2015 at 15:55, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> 
>> Is there an off the shelf over pressure valve that I can get?
>>  
>> Brian
>> 
>> --- personal_submersibles at psubs.org wrote:
>> 
>> From: James Frankland via Personal_Submersibles <personal_submersibles at psubs.org>
>> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
>> Subject: Re: [PSUBS-MAILIS! T] Snorkel
>> Date: Wed, 14 Jan 2015 13:58:24 +0000
>> 
>> Yes, my OP valve does not have enough holes.  I have a job over the winter to add more or drill existing holes bigger. 
>> 
>> On 14 January 2015 at 13:04, Emile van Essen via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> Mark, All.
>> 
>> Mind the area is big enough. The valve in the attachment is designed for a
>> 3000 Kg sub. But even then it is to small if you surface too quick in case
>> of massive overpressure.
>> Cracking pressure: 25-75 mBar.
>> 
>> 
>> Best regards, Emile
>> 
>> -----Oorspronkelijk bericht-----
>> Van: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
>> Namens Mark via Personal_Submersibles
>> Verzonden: dinsdag 13 januari 2015 13:12
>> Aan: Personal Submersibles General Discussion
>> Onderwerp: Re: [PSUBS-MAILIST] Snorkel
>> 
>> Since we are discussing over-pressure valves, can you recommend a make and
>> model, or describe its specifications?
>> 
>> Regards,
>> 
>> Mark...
>> 
>> Sent from iPhone.
>> 
>> > On Jan 12, 2015, at 7:06 PM, Pete Niedermayr via Personal_Submersibles
>> <personal_submersibles at psubs.org> wrote:
>> >
>> > Scott, I see you have an overpressure valve in place of the snorkel .
>> Whats that on the other side ?
>> >
>> > Pete ?
>> > --------------------------------------------
>> > On Mon, 1/12/15, via Personal_Submersibles
>> <personal_submersibles at psubs.org> wrote:
>> >
>> > Subject: Re: [PSUBS-MAILIST] Snorkel
>> > To: "Personal Submersibles General Discussion"
>> <personal_submersibles at psubs.org>
>> > Date: Monday, January 12, 2015, 5:09 PM
>> >
>> > I
>> > would recommend a cabin overpressure valve instead. It is a
>> > mushroom valve. You can see pics on my sub page. Alec
>> > did the same thing.
>> >
>> > Thanks,
>> > Scott Waters
>> >
>> >
>> > -------- Original
>> > Message --------
>> > Subject: [PSUBS-MAILIST] Snorkel
>> > From: Pete Niedermayr via Personal_Submersibles
>> > <personal_submersibles at psubs.org>
>> > Date: Mon, January 12, 2015 3:58 pm
>> > To: personal_submersibles at psubs.org
>> >
>> > I have a set of K 350 plans that I'm using as a
>> > reference for my own design. I'm using the conning tower
>> > plans pretty much as per. The question I do have is. Snorkel
>> > or no snorkel ? On the one hand I can see how it would be
>> > useful have. On the other hand no other design seems to have
>> > one. What are your opinions? Snorkel or no snorkel?
>> >
>> > Pete
>> > _______________________________________________
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>> > Personal_Submersibles at psubs.org
>> > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>> >
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