jvanostrand
Diver
Posts: 20
Joined: Fri Aug 12, 2011 8:39 pm
First Name: John
Location: Waterloo Ontario

History of Adjustable/Balanced Second stages

Mon May 29, 2017 8:40 pm

Hi All,

I'm curious about the evolution of user adjustable and balanced second stages. My first experience with such a second was with Apeks which has both work-of-breathing adjustment and venturi adjustment. I then noticed several other regs like HOG are practically identical, as if they are copies. I also have a ScubaPro 109, received as a gift, although not balanced, it has adjustable WOB. I just finished watching the VDH 109 service video and heard the comment about a balanced poppet option so I looked at the ScubaPro regulator timeline on ScubaPro's site and see that the 109 was from 1969 and balanced was from 1985.

Now there was the Dacor dial-a-breath which looks like an early venturi adjust for DH regs but I don't have any idea about early venturi adjust for single hose.

Where those the first occurrences of adjustable seconds? When did venturi adjust come into single hose seconds?

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Bryan
Plank Owner
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Joined: Fri Jun 24, 2005 11:40 am
First Name: Bryan
Location: Wesley Chapel Florida
Contact: Website

Re: History of Adjustable/Balanced Second stages

Tue May 30, 2017 2:15 pm

Several single hose regulators had a diverter built into them....The 1085 USD and the Dacor line that I remember for sure but the first user adjustable I remember ever seeing was on a G250 in the 80's.
Doing it right should include some common sense, not just blindly following specs and instructions. .Gary D, AWAP on SB

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tripplec
Master Diver
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Joined: Thu Mar 28, 2013 1:44 am
First Name: Chris
Location: Coos Bay Oregon
Contact: Website

Re: History of Adjustable/Balanced Second stages

Fri Jun 02, 2017 10:30 pm

Im more curious who first developed the air barrel on the 109. Many are still using it today, but was it SP's idea, SP copy someone, or an accumulation of every manufacturer adding one improvement at a time.

Sent from my SAMSUNG-SM-J320A using Tapatalk

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antique diver
Master Diver
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Joined: Sun Dec 10, 2006 12:50 pm
First Name: Bill
Location: North-Central Texas

Re: History of Adjustable/Balanced Second stages

Sat Jun 03, 2017 12:30 pm

[quote="jvanostrand"]Hi All,


.... Now there was the Dacor dial-a-breath which looks like an early venturi adjust for DH regs but I don't have any idea about early venturi adjust for single hose.

Dacor should have labeled the adjustment point extremes "bad" and "worse". :?
The older I get the better I was.

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Bronze06
Master Diver
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Joined: Tue Jul 01, 2014 5:33 am
First Name: Russell
Location: Tabuk, Saudi Arabia

Re: History of Adjustable/Balanced Second stages

Sun Jun 04, 2017 8:13 am

Well, technically speaking. Air intake control by the diver goes back to THIS:


Full Dress diver with left hand on air control valve..jpg

My attempt at some diving humor.
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"Where'd ya get that ol' thang, don't cha' know them thare things ill kill ya!"

Live From the Red Sea,

Russ

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