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Thanks for the description David. Most who don't dive cold have recommended the non-sealed. Why is this the case given the internals are so similar? More compact? Fewer parts? Less failure prone? My diving will be mostly saltwater, non-cold. At what water temp does freezing become a concern? Thanks again, Stan Dilcher >From: "Shimell, David (shimell)" <shimell@se*.co*> >To: Stan Dilcher <divewrecks@ho*.co*>, techdiver@aquanaut.com >Subject: RE: Thanks for Apeks Info! >Date: Tue, 30 May 2000 05:08:44 -0700 > >Stan > > >Can someone please comment on the advantages/disadvantages of sealed vs. > >non-sealed first stages (as in the Apeks models)? I'm not sure I >understand > >the difference or if one has a higher potential for failure in certain > >conditions. I don't plan on cold water diving at this point. > >The sealed version differs only in that it has a slightly longer first >stage >and what looks like a silicone environmental seal. In the event of the >seal >being damaged, water will ingress and you now have an unsealed first stage >just like a US4. Thus, an environmental seal failure will not be a >problem. > >To explain further. Inside the sealed compartment are the same innards as >a >US4 - A SS spring, screw thrust adjuster, pressure cap and diaphragm. It >is >the diaphragm that seals the remaining functional parts of the first stage >innards from water. So if you lose the environmental seal the diaphragm >provides a (second) water seal just like a US4. > >The environmental seal simply prevents water getting inside where the lack >of >water motion and well conducted cooling due to pressure drop could result >in >ice formation. I dive all year round in the UK with no problems when using >sensible precautions. I have no experience in sub 4 deg C conditions so >don't >read anything into the suitability for this sort of diving. > >David Shimell >shimell@se*.co* <mailto:shimell@se*.co*> >DDI: 01932 814096 * Mobile: 07770 282 202 * Fax: 01932 814343 >Project Manager, IBM UK Web Server Group, Sequent Computer Systems Ltd, >Weybridge Business Park, Addlestone Road, Weybridge, Surrey, KT15 2UF, UK >registered in England and Wales under company number: 1999363, registered >office as above > >-----Original Message----- >From: Stan Dilcher [SMTP:divewrecks@ho*.co*] >Sent: Sunday, May 28, 2000 8:16 PM >To: techdiver@aquanaut.com >Subject: Thanks for Apeks Info! > >Thanks to the many people who have provided information in response to the >Apeks regulator questions I posed. It looks like recommendations point to >the the US4/TX40 combo. This will be for my first doubles rig that I am >doing some advanced planning for. At present I am planning on a Scuba Pro >R380 for a backup. My main diving interest is ocean/wreck diving. > >Can someone please comment on the advantages/disadvantages of sealed vs. >non-sealed first stages (as in the Apeks models)? I'm not sure I understand >the difference or if one has a higher potential for failure in certain >conditions. I don't plan on cold water diving at this point. > >If anyone can provide any US dealer info with regards to a US4 DIN/TX40 >combo I would appreciate it. > >Thanks again to everyone who responded, >Stan Dilcher > > >________________________________________________________________________ >Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com > >-- >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. >-- >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. ________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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