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

[flymolo]

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

Cave, Wreck / Anti-Roll Knob for Lola Valves

These are a special knob for Lola valves! This knob replaces your standard handwheel knob from shutting off while diving on a wreck or inside a cave! We feel this is a great little knob that gives peace of mine while inside a cave or diving on a wreck you now do not have to worry about your...

www.piranhadivemfg.com

though i wouldn't find them necessary myself

 

[flymolo]

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

 

[tursiops]

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.

 

[flymolo]

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

 

[tursiops]

I've never heard of these. Can you provide a link?

 

[rjack321]

I've never heard of these. Can you provide a link?

Help us out here, a link to what?

 

[tursiops]

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.

 

[flymolo]

Help us out here, a link to what?

sorry that was me posting about something that i swear i saw on a boat once (it was a set of doubles with opposing valves that turned the same direction). but i can't find any evidence of those anywhere so i can't be certain they exist

 

[grantmac]

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.

 

[J-Vo]

I've rolled off many a suit gas bottle with my thigh, although they are quirky non-traditional valves on those 1L carbon fiber tanks so not a good example.

I have rolled off the right side SM tank once in an actual cave while in a sidewinder so I "lost" dil until I realized the issue.

I have also rolled off the O2 bottle on my sidewinder, but I don't think I had it open very far.