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SurfLung
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First Name: Eben
Location: Alexandria, MN
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Do J-Valves Increase Breathing Effort?

Fri Oct 21, 2016 9:47 am

Do J-Valves Increase Breathing Effort?
- There was a discussion on another forum about how SPG needles will move when you breath using a J-Valve in the up position. I checked out my own J-Valves and they all did it just as Herman said they would. But in the process of breathing with the J-Valve up and with it down, I think I detected the breathing effort to be a little harder when the J-Valve was up (reserve "ON").
- Am I just imagining that?
SurfLung
The Freedom and Simplicity of Vintage Equipment and
Vintage Diving Technique are Why I Got Back Into Diving.

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captain
Plank Owner
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Re: Do J-Valves Increase Breathing Effort?

Fri Oct 21, 2016 10:31 am

A way to check is to attach an IP gauge to the hookah port and check the pressure drop with the J on and off. If there is no difference than breathing effort should be the same.
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SurfLung
Master Diver
Posts: 1763
Joined: Sat Jan 01, 2011 2:03 pm
First Name: Eben
Location: Alexandria, MN
Contact: Website

Re: Do J-Valves Increase Breathing Effort?

Mon Oct 24, 2016 9:31 am

Thanks Tom. I tried that this weekend. Hooked the IP gauge to the hookah port. The needle goes from 110 down to 90 when I inhale. And it does the same thing whether the reserve lever is up or down.

So the answer to the question is: No, J-valves Do NOT increase breathing effort. :)
SurfLung
The Freedom and Simplicity of Vintage Equipment and
Vintage Diving Technique are Why I Got Back Into Diving.

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