Lessons My sidemount cylinder valve spun itself completely shut during a dive

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that being said these odd handwheels do exist (for lola valves anyway)


though i wouldn't find them necessary myself
 
Granted. But if it weren't an issue this thread wouldn't exist.
i think the conclusion was that a buddy may have turned a valve the wrong way on accident, unless i missed something.

there are a lot of cave divers diving through restrictions on a regular basis who don't feel the need to fix a problem that can be better addressed through awareness
 
that is exactly the reason for opposing valves. one rolls off whereas the other rolls on
LOL, not really a "reason for opposing valves" but perhaps an advantage of the valves which are opposing for a quite different reason....they are the same internal valves but are made for L and R-hand use.
 
LOL, not really a "reason for opposing valves" but perhaps an advantage of the valves which are opposing for a quite different reason....they are the same internal valves but are made for L and R-hand use.
i deleted another reply because i agree- whether it's an advantage by mistake or on purpose i don't think that matters
 
I've never heard of these. Can you provide a link?
 
I've never heard of these. Can you provide a link?
The original version of post #54 said some valves operated in opposite directions, i.e. righty loosey lefty tighty. I asked for a link.
 
Could we fabricate a sort of "lift to turn" gadget to 1) prevent inadvertent adjustment, while 2) making it easy to adjust when intentional?

Most tank knobs have serrations around their circumference. A little gadget could engage those and prevent modest torque from turning the knob, yet be easily disengaged or defeated with more force.
Drâger light surface supply tanks have a valve which has to be depressed to turn off. Mostly a pain and I really wouldn't want to have to do a shutdown or feather.
 

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