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Thread: H-Valve vs. Y-Valve

 


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    brutus_scuba's Avatar
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    H-Valve vs. Y-Valve

    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)

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    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.

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    rjack321's Avatar
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    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.

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    As I understand it, H-valves do not have redundant air paths whereas Y-valves do. I wouldn't dive a single tank without a redundant air path myself (I dive with a pony or doubles).
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    What is a redundant air path?

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    Jimmer's Avatar
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    Quote Originally Posted by OneBrightGator View Post
    What is a redundant air path?
    2 dip tubes, one for each post.
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    OneBrightGator's Avatar
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    Ok...

    Redundant: having excess or duplicate parts that can continue to perform in the event of malfunction of some of the parts.

    So to say something has redundant air paths to me means that if one air path from the tank to a regulator fails, there is another seperate air path to use.

    What you're describing is independent air paths. If one fails you have a whole other seperate system to replace it.

    However, I've seen a few different Y-valves and none of 'em had two dip tubes... I'd like to see that...

  8. #8
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    Quote Originally Posted by OneBrightGator View Post
    However, I've seen a few different Y-valves and none of 'em had two dip tubes... I'd like to see that...
    Beuchat makes a Y-valve with two dip tubes:



    I thought Beaver Sports in the UK made a similar T-valve, but it only has one dip tube (like an H-valve):

    Attached Thumbnails Attached Thumbnails yvalve.jpg  
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    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.

    Thanks for the input.

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    OneBrightGator's Avatar
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    I've seen that Y valve on a tank, but never without, so that is pretty interesting that it has two dip tubes. Does it really have independent air paths?

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