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Discussion in 'DIR Diving' started by Gareth Burrows, Oct 25, 2010.
I agree with this completely.
now I need to go and have a lie down
Well it is Monday
could i just mention if people learn righty tighty, lefty loosey, thier valves could be open, shut, half way, either way, they would know what way to turn them, this is something that was hammered to death by the person who took me on my into to tec many moons ago
And every engineer learns this on day one as an apprentice
We're taught righty tighty lefty loosey from a very young age. All cans and jars follow this, as do the majority of taps, most screws and bolts and anything else that tightens and loosens.
Even so, when the pressures on (or dropping rapidly, as the case may be ), people get it wrong.... if you are only half open, you then need to go all the way the wrong way, realise your mistake when the bubbles don't stop, and then go all the way the right way... or then perhaps the bubbles didn't stop because you went the right way but the shutdown didn't resolve the problem? That element of uncertainty can cause mistakes and delays...
Some agency/group did a test on this a few years back, found that the all the way open was consistently faster then partially open, due to mistakes under stress... and that was using some very experienced techies, who were all used to a partially open system.
So, despite my own confidence in being able to open a jar/bottle etc correctly every time, my cylinder valves are all the way open. My manifold, however, is just half a turn open... I can do that with one twist (and if it takes more then one twist, I've gone the wrong way), I don't need the valve fully open, just enough to allow it to equalise as the pressure drops.
...unless you are using a left hand thread
Know of many left-handed cylinder valves then?
Only a bungied numpty would do such a thing, and they're going to die anyway, so it doesn't really matter
...are you sure you're not GUE?
Just to give a perspective on this. At the fundies level the valve drill is really about building team awareness and good team position in the water whilst task loaded (shutting down a valve) This is what often presents the biggest challenge, rather than the mechanics of the drill itself.
Admit it Stu.... you're signing up for Fundies in January aren't you?
Aha, yes, the barrel of your manifold has a left hand thread on one end and right hand thread on the other, otherwise it would be impossible to set the manifold centre width, other than physically winding one of the cylinders around the manifold as turning the manifold would tighten in one cylinder and undo in the other.
Ok, so not actually a valve as per your meaning, but still part of the manifold 'valve' on a set of manifolded scuba cylinders.
You're clutching at straws with that one mate
Maybe...still right though
You're right about one side of the manifold having a left hand thread...
But completely incorrect about the cylinder valve having a left hand thread.
That's like saying your big toe governs your sex drive, it's connected there somewhere, just not directly.
And no that doesn't mean I want to see your toes mate, I don't swing that way... Sorry
MOD's, feel free to remove inane babbling, I can only apologise for Silty hijacking the thread.
I may head along, just to say hi to people.... not sure my CCR would be allowed on the course though