menemsha1968
Skin Diver
Posts: 42
Joined: Sun Sep 07, 2014 11:33 am
First Name: Dean
Location: Marine City MI

Duck Bill Eliminator

Sat Oct 11, 2014 3:34 pm

Is there an advantage to the duck bill eliminator over a silicone duck bill valve? It would seem to me that the material of the DBE itself would take up some volume inside of the horn, however slight, and thus be a reduction to the exhaust air passage way. I haven't found my existing duck bills to be all that restrictive to exhalation effort, but then, I've not yet tried the alternative. Any one out there have experience with both, for a comparison?

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Bryan
Plank Owner
Posts: 5264
Joined: Fri Jun 24, 2005 11:40 am
First Name: Bryan
Location: Wesley Chapel Florida
Contact: Website

Re: Duck Bill Eliminator

Sat Oct 11, 2014 4:13 pm

Search feature results

viewtopic.php?f=4&t=5290&hilit=duckbill+eliminator

viewtopic.php?f=4&t=5151&hilit=duckbill+eliminator

viewtopic.php?f=4&t=4414&hilit=duckbill+eliminator

After 4 years and over 500 sold I think it's safe to say it works pretty well.
Doing it right should include some common sense, not just blindly following specs and instructions. .Gary D, AWAP on SB

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luis
VDH Moderator
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Joined: Thu Jun 30, 2005 9:28 pm
First Name: Luis
Location: Maine

Re: Duck Bill Eliminator

Sat Oct 11, 2014 9:33 pm

I have done instrumented flow test on both using good scientific methodology to get good comparison in a controlled environment. The data is here:
viewtopic.php?f=26&t=7133

The bottom line is that the duckbill eliminator has as low flow resistance as the best rubber style duckbill, but not as good as a silicone duckbill. The silicone duckbill has extremely low flow resistance. But when the flow resistance get so low, does it really matter...

Lets just say that I have no plans on ever again buying a duckbill. The convenience of the duckbill eliminator is so superior that I have no intention on ever using a duckbill (with only one exception, just to keep one regulator original).

Now I really only dive a Argonaut Kraken, which has the lower flow resistance of any double hose, all my other regulators that I used to dive have duckbill eliminators.
Luis

Buceador con escafandra autónoma clásica.

menemsha1968
Skin Diver
Posts: 42
Joined: Sun Sep 07, 2014 11:33 am
First Name: Dean
Location: Marine City MI

Re: Duck Bill Eliminator

Sun Oct 12, 2014 8:22 pm

Cool; thanks for the info, guys. I'm getting one.
I wonder what the numbers would be if the same tests were to be conducted with the entire housings and valves submerged under water.

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