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Din or Yoke first stage regulator for a pony bottle

Discussion in 'Tanks, Valves and Bands' started by Dnaber, Jun 29, 2020.

  1. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
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    DIN
    if the pony is unpressurized the yoke could actually get knocked off fairly easily.
     
  2. 2airishuman

    2airishuman ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 100 - 199
    Location: Greater Minnesota
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    For general diving yoke attachments work fine but there are reasons you want to use DIN on a slung pony.

    In general, slung ponies are dived with the valve off (though the reg should be charged before the dive). This poses two problems for yoke regulators:

    1) It is easy to mix up the valve handwheel and the yoke attachment handwheel in an emergency because they look and feel similar. If this occurs, the diver will loosen or remove the regulator from the valve rather than opening the valve, with potentially serious consequences. While charging the regulator before the dive does help with this, there is no guarantee the system will remain pressurized. DIN valves don't have this problem because the attachment wheel is located between the valve and the reg making it look and feel very different.

    2) Yoke valves are prone to ejecting the O-ring if the regulator is not fully seated on the valve due to misalignment, bent parts, or insufficient tightening of the handwheel. This can happen even to experienced divers. There is no reliable, effective way to correct this once it occurs underwater. DIN valves don't have this problem because the o-ring is captured inside the connection.
     
    Boston Breakwater likes this.
  3. wstorms

    wstorms ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Netherlands
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    DIN. Always DIN. Unless you have specific medical issues (like severe arthritis in your hands making turning a DIN wheel more difficult) DIN is better in every way.
    The main reason to consider yoke is availability, but this is solved with an adapter. If you buy your own cylinders, it is not an issue at all. Make sure to get a convertible valve (little dimple on the back and comes with an insert), so you have the option to use yoke if really needed, this way you can use your current reg as well. Convert it to DIN if possible.
    New regs? DIN.

    The main reason yoke hasn't died out yet is because the valves are a bit cheaper (like 5$ or so). Doesn't make a difference for most individual divers, but if you need to get 200 valves for a resort or something like that it starts to add up...
     

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