[PSUBS-MAILIST] over pressure valve

Fri Jun 19 16:31:35 EDT 2015

Imagine how long it will take to equalize with a 1 or 2 lb pressure difference, better bring a lunch while your trying to hover at the perfect depth. :-) 
I can remove 1 psi over pressure in about 5 seconds
Hank--------------------------------------------
On Fri, 6/19/15, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] over pressure valve
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Friday, June 19, 2015, 4:19 PM

 You have
 to be experienced to surface slowly and hover while the
 valve leaks out the
 air.--------------------------------------------
 On Fri, 6/19/15, Alec Smyth via
 Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:

  Subject: Re:
 [PSUBS-MAILIST] over pressure valve
  To:
 "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
  Received: Friday, June 19, 2015, 4:16 PM

  I
  don't
 get the "in the hands" part... its
  completely automatic.
  On Fri,
 Jun 19, 2015 at
  4:09 PM, hank pronk via
 Personal_Submersibles <personal_submersibles at psubs.org>
  wrote:

  Agreed,

  In
 the hands of an experienced submarine operator an over
  pressure valve is safe, providing it is large
 enough.  I
  have not seen an example of a
 large enough OPV.  A simple
  valve in the
 hatch will do the same job, just need an

 umbrella :-)

  The noise of
 a compressor is a welcome sound if it means

 keeping the dome on the sub :-)

 Hank--------------------------------------------

  On Fri, 6/19/15, Carsten
 Standfuß" via
  Personal_Submersibles
 <personal_submersibles at psubs.org>
  wrote:

   Subject: Re:
 [PSUBS-MAILIST] over pressure valve

   To: "Personal Submersibles General
 Discussion"
  <personal_submersibles at psubs.org>

   Received: Friday, June 19,
 2015, 2:47 PM

   But a overpressure vale
 works

   full auto. A
 compressor

   not.  

   A OPV needs

   no energy - but a compressor did.

   A OPV
 needs no room - but

   a
 compressor did.

   And a

   compressor is

   a noisy solution..

   vbr

   Carsten

   "hank

   pronk via Personal_Submersibles" <personal_submersibles at psubs.org>

   schrieb:

   > Personally I think an onboard

   compressor is a much safer
 option than an over pressure

   valve.  There are multiple safety benefits
 to an
  onboard

   compressor, over pressure being the biggy. 
 With a

   compressor you
 can get rid of the pressure without

 surfacing

   and trying to
 control a perfect ascent.  With the OPV

 you

   have to surface a
 bit and let air out and wait then

 surface

   more and wait
 and so on. You can't just surface and

 hope

   the valve keeps up
 with the demand. This is more
  important

   for subs with large
 domes.

   > The next

   benefit to a compressor
 is, if you lost all your air,
  you

   surface by dropping your
 weight.  In my case the weight
  is

   small and I would also
 drop the thruster and tail
  assembly.

   Still, not much sub out of
 the water.  With the
  compressor,

   I can open my vent valve
 in the hatch and use the
  compressor

   to fill the ballast
 tanks.

   > Hank

   >

  _______________________________________________

   > Personal_Submersibles
 mailing list

   > Personal_Submersibles at psubs.org

   > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

   >

  -----Inline Attachment Follows-----

  _______________________________________________

   Personal_Submersibles
 mailing list

   Personal_Submersibles at psubs.org

   http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

 _______________________________________________

  Personal_Submersibles
 mailing list

  Personal_Submersibles at psubs.org

  http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

  -----Inline Attachment Follows-----

 _______________________________________________
  Personal_Submersibles mailing list
  Personal_Submersibles at psubs.org
  http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

 _______________________________________________
 Personal_Submersibles mailing list
 Personal_Submersibles at psubs.org
 http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles