Oh, no....the valves will do thier own thing against ambient pressure. You buy valves that will open easily against sea pressure.
Joe
From: "Patrick" <pat_man_ta@hotmail.com>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: Re: [PSUBS-MAILIST] Ambient / 1ATM Q?
Date: Thu, 19 Jan 2006 12:25:03 -0500
So, in theory, the check valves can be set to retard or lessen the pressure buildup from outside based on the strength of the vessel?eg:depth pressure = 4ATMcabin pressure = 2ATM?patrick----- Original Message -----From: Joseph PerkelSent: Thursday, January 19, 2006 11:40 AMSubject: RE: [PSUBS-MAILIST] Ambient / 1ATM Q?************************************************************************ ************************************************************************ ************************************************************************ The personal submersibles mailing list complies with the US Federal CAN-SPAM Act of 2003. Your email address appears in our database because either you, or someone you know, requested you receive messages from our organization. If you want to be removed from this mailing list simply click on the link below or send a blank email message to: removeme-personal_submersibles@psubs.org Removal of your email address from this mailing list occurs by an automated process and should be complete within five minutes of our server receiving your request. PSUBS.ORG PO Box 311 Weare, NH 03281 603-529-1100 ************************************************************************ ************************************************************************ ************************************************************************
Patrick,
As the question is specific to an ambient dry sub which is my design profile, I will answer you in that regard. Whereas a semi-dry or open ambient has a direct connection to the outside ambient pressure, to remain a truly dry ambient requires the use of check valves.
The pressure is equalized by a constant flow of air introduced into the cabin which opens the check valves and dumps the overpressure outboard. The outside ambient pressure does not directly impact the cabin as you noted. There is a delay in compensation, which limits descent rate to design structural capability.
To oversimplify the 1 atm vessel keeps the pressure out by the brute force of it's designed structural integrity.
Joe
From: "Patrick" <pat_man_ta@hotmail.com>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: [PSUBS-MAILIST] Ambient / 1ATM Q?
Date: Thu, 19 Jan 2006 11:21:48 -0500
I am having some trouble wrapping my head around HOW the outside pressure influences the inside pressure in an ambient dry sub and how a 1ATM sub keeps the pressure out. Could someone explain this to me?-patrick