Conshelf 14 exhaust valves

[buddhasummer]

I have some new conshelf 14s and noticed they use a yellow exhaust valve, which feels notably stiffer than the ones sold by VDH and the DiveRite ones(which can also be used). I'm assuming using a softer more supple exhaust valve would be an improvement? In exhalation effort, how much of an improvement I'm not sure, perhaps not even noticeable. If there would be an increase in performance regardless of amount then I'll swap them all out, if not I'll not bother.

Thank you.

 

[northernone]

Here's one data point.

I tried a yellow one. Tested it, deep enough to matter, I wasn't aware of a difference when switching to a regular (circa 1980 vintage) one. Perhaps logic will be our guide on this one and we could assume it adds resistance. I'm just not sensitive enough to tell, it's one of my 3 regular use regs and I don't know without looking

... co2 retention and exhalation restriction is hard to gauge. I've felt it between various regs and smaller port versions of the same reg. But not different flapper material.

Cheers,
Cameron

 

[buddhasummer]

@Nemrod :your thoughts James? I seem to recall you talking about this very subject but cannot find the thread. Cheers and Merry Christmas.