[PSUBS-MAILIST] over pressure valve

["Carsten Standfuß" via Personal_Submersibles]

Most time the OPV akts on the surface to equalize the small pressure difference before you unlock the hatch.
Just to safe your ear drums on a long term. 

On Euronaut we have a normal manual ball vale in the hatch to do so. 
You are right on Euronut a overpressure vale will be a really huge think. 
Its not installed for this reason - instead two large compressors. 
But the hatch of Euronaut has heavy hinges and locking device and can handle some overpressure. 

But for 1-3 men sub the OVP is the much better solution. 

"hank pronk via Personal_Submersibles" <personal_submersibles at psubs.org> schrieb:
> 
> 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
> 
>  >
> 
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