RE: [PSUBS-MAILIST] Pressure relief valve?

["Alec Smyth" <Alec.Smyth@compuware.com>]

To tell the truth I didn't remember Dobrovolsky, but a quick Google
search revealed this: "Male, Married, Two children. Born in Odessa,
Odessa, Ukraine. Cause of Death: Killed in cabin depressurization of
Soyuz 11."

I see! 

I have some spare little Swagelok ball valves lying around, and they're
looking increasingly useful. I guess I'd put them in series with the
ball-and-spring. The ball and spring would prevent any significant
amount of seawater entering once the pressures were equalized. There is
of course a separate and much larger ball valve without any
ball-and-spring, for flooding the boat if I needed to do that.

Thanks,

Alec

-----Original Message-----
From: atozed@juno.com [mailto:atozed@juno.com] 
Sent: Tuesday, September 21, 2004 11:21 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Pressure relief valve?

Use a manual valve instead of ball and  spring.
Remember Dobrovolsky?
-PK

On Tue, 21 Sep 2004 01:25:15 -0400 "Alec Smyth"
<Alec.Smyth@compuware.com> writes:
> I'm wanting to install a pressure relief valve to cover against a 
> pressure buildup in the cabin popping off the dome upon surfacing. 
> The idea would be to put this valve directly onto the ambient 
> pressure line that leads to the depth meter, so as to use an 
> existing through-hull. If pressure in the cabin exceeded ambient, it 
> would bleed off to the outside. I bought a check valve that's a 
> simple nylon ball and spring affair, good to 400 psi, but it doesn't 
> seem to seal 100% effectively at low pressure. Does anyone have a 
> recommendation?
>  
> thanks,
>  
> Alec
> 
> 
> 
> 
>
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