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**Dave Sutton** · 18th April 2008, 11:45

Quote: (Originally Posted by seeboth)

i think Dave Sutton has posted on a Mccr that uses a depth compensating first stage and an orifice, and you just use the right orifice for the right depth, then just add more frequently when you are shallower to maintain your po2.

I have not: That is 180 degrees out of my suggestions.

I use blocked first stages for everything I build. I DO NOT suggest or support the use of non blocked first stages for mCCR "leaky valve" systems of any sort, orifice or needle valve. I'm not a needle valve fan either, and a search will come up with the posts that articulate my reasons.

And, not for nothing: You are making this WAY too complex. Just grab any small orifice, hook it up to a first stage, adjust the intermediate pressure to give you somewhere about 0.7 LPM and block off the first stage. Add 02 using a manual add valve as needed. Go diving. If I spent as much time thinking about this as some of you, I would never have built a thing.

Theory is only valid insofar as it reflect reality.

The reality is that this is butt-simple stuff to build.

Best,

Dave

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18th April 2008, 11:45	#34 (permalink)
Dave Sutton Diveshop of Horrors Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,672	Re: O2 addition methods Quote: (Originally Posted by seeboth) i think Dave Sutton has posted on a Mccr that uses a depth compensating first stage and an orifice, and you just use the right orifice for the right depth, then just add more frequently when you are shallower to maintain your po2. I have not: That is 180 degrees out of my suggestions. I use blocked first stages for everything I build. I DO NOT suggest or support the use of non blocked first stages for mCCR "leaky valve" systems of any sort, orifice or needle valve. I'm not a needle valve fan either, and a search will come up with the posts that articulate my reasons. And, not for nothing: You are making this WAY too complex. Just grab any small orifice, hook it up to a first stage, adjust the intermediate pressure to give you somewhere about 0.7 LPM and block off the first stage. Add 02 using a manual add valve as needed. Go diving. If I spent as much time thinking about this as some of you, I would never have built a thing. Theory is only valid insofar as it reflect reality. The reality is that this is butt-simple stuff to build. Best, Dave . __________________ "Changes in Lattitudes, Changes in Attitudes, Nothing remains quite the same".... www.nobubblediving.com Last edited by Dave Sutton : 18th April 2008 at 11:52.
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