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I have a LP 108, with an H-valve on it, and I was checking out the GUE website and noticed that for GUE-F I could use a single tank with an H-Valve but for Recreational TriOx I would need to a Y-Valve if I were going to use a single tank. Why does DIR prefer the Y-Valve or am I misreading the gear configuration requirments. I know doubles would be the most desirable learning platform if I planned on advancing, but those will come with time (and money after all I'm a recent college grad getting ready to start his first real job)
First of all I am NOT a DIR person. Them preferring an Y over an H is a mystery to me as with an H you can shutdown a regulator set independent of the other, however a Y only allows the whole system either on or off.
H's have a boatload of orings and all the failures of a manifold but no isolator so they are a poor choice to get regulator redundancy. Y's are two regs but minus all the connecting orings and threads so a better way to get redundant regs on a single tank. And Slowrain is incorrect - each reg is fully independent on a Y valve. You still have one tank neck oring and one burst disk.
But for all practical purposes forget about H and Y valves in DIR. It may be mentioned in the standards but its not done in practice. Single tank down to 100ft is fine. Redundant doubles for overhead, deeper, or dives warranting redundant regs.
This makes a lil' more sense to me now. There are a bunch of o-rings on the H-valve. I had never seen a Y-valve like the ones in post #8. The Ones I had seen had knobs that were definatley not DIR, but I like those valves. I wish I would have seen em' before I bought the H-valve. Oh well.