This question is like asking what leaded gasoline is used for on a current driving exam.
Except that there are certain types of diving that regulations still require its use (no-vis).
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This question is like asking what leaded gasoline is used for on a current driving exam.
I started off with the J-valve and developed the J-valve twitch where I was regularly checking that it had not been pulled down by something. Most of my early dives were 30 minutes because I never knew how much gas I had and I did not like to wait until I needed to pull it down.E: Find out that somehow that level got pulled down and now you are truly out of air.
I started off with the J-valve and developed the J-valve twitch where I was regularly checking that it had not been pulled down by something. Most of my early dives were 30 minutes because I never knew how much gas I had and I did not like to wait until I needed to pull it down.
I also checked frequently, never got pulled down accidentally. I dived frequently in the California kelp and heard stories of accidental openingI started off with the J-valve and developed the J-valve twitch where I was regularly checking that it had not been pulled down by something. Most of my early dives were 30 minutes because I never knew how much gas I had and I did not like to wait until I needed to pull it down.
Exactly, the zero vis type dives. I am starting to use them out of curiosity and to work my way towards true vintage. So there is a market/audience for them, albeit a small one.I am a little young and inexperienced and never dove a j-valve, although learned about it enough to know how it works. I understand why it was used in 50-60-70’s but why would anybody use J-valve nowadays? Is this for situations when the visibility so low you can not read your depth gauge or a computer? Or is this a historical question?
Air was not cut off, breathing resistance increased and you knew to pull the lever and ascend . In those days, ascent was 60 ft/min and there was no safety stop. Using a steel 72, filled to 2450 psi, my ascent took less than 100 psi from as deep as 130 ft. I only dived a J valve for a couple years/around 50 dives, before I bought a SPG.For some reason at first my brain refused to accept "having your air cut off" as a "warning mechanism". Shows how soft I am .