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P-valve not connected

Discussion in 'General Scuba Equipment Discussions' started by giovyledzep, Jan 12, 2020.

  1. giovyledzep

    giovyledzep Angel Fish

    # of Dives: 50 - 99
    Location: Europe
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    My new drysuit came with a Heser p-valve. I'm not going to need it until I will start doing longer and deeper dives, but I will use my drysuit tomorrow without connecting the p-valve and I'm not clear on wether it should stay open or closed, or will have to be opened/closed during the dive.

    Apparently it has an integrated balance chamber, so it's balanced even if it doesn't have the T hose configuration.
    This is the manufacturer's manual where it should be explained but I don't really understand it as the english is a bit funny http://heser-backup.de/shop/pdf/PeeValve_en.pdf

    Like I said I dive tomorrow so the manufacturer nor the drysuit company would get back to me in time.
    Should I keep it open? Closed? Open it during ascent?

    Sorry if I created a new thread in vain but I couldn't find an answer on other threads.

    Thanks
     
  2. Searcaigh

    Searcaigh Chromodoris gordonii Staff Member ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Dubai, UAE
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    I use a Light Monkey pee valve and if not connected I always keep it closed.
     
    Dark Wolf likes this.
  3. giovyledzep

    giovyledzep Angel Fish

    # of Dives: 50 - 99
    Location: Europe
    39
    14
    8
    That's what I thought too, but under 5.0.1.1.2 of the manual (which should be my situation) it says that if the valve stays closed the pressure accumulated during the dive will remain in the balance chamber and damage the valve during ascent (if I'm interpreting that correctly?). But then it says that the system is tight to the outside only as long as the valve is closed, so it would be pretty annoying to have to open the valve on ascent and risk leaks due to not having enough pressure in the chamber to keep the water out. I don't really understand...
     
  4. Lorenzoid

    Lorenzoid idling in neutral buoyancy

    # of Dives: I just don't log dives
    Location: Atlanta, USA
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    The balance port couples the pressure in the suit with the pressure in the hose that would otherwise be connected to you. Closing the valve just seals all of that against the environment outside the suit.
     
  5. giovyledzep

    giovyledzep Angel Fish

    # of Dives: 50 - 99
    Location: Europe
    39
    14
    8
    That's what I thought, so why would they say:
    "The cap must remain open when it emerges. or every 10m. Otherwise the pressure of the immersion depth remains between the sealing cap and the shield valve in the PeeValve. The shielding valve can be permanently deformed A danger occurs not because of that. The system remains continues to be tight to the outside as long as the cap re- mains closed" ... ?

    From that description it sounds like the pressure of the suit at depth is trapped in the balance chamber by a non-return valve, and if it isn't purged during ascent the air expands and deforms the chamber.
     
  6. Lorenzoid

    Lorenzoid idling in neutral buoyancy

    # of Dives: I just don't log dives
    Location: Atlanta, USA
    9,186
    5,743
    113
    Terrible English, for sure. My guess is that they are presuming the hose is hooked up to you during ascent—in other words, the hose (and thus the balance chamber) is capped off. If the hose is not capped off during ascent, it has no effect, as the air in the hose remains at the same pressure as the air within the suit and within the balance chamber. That’s my guess.
     
  7. Marie13

    Marie13 Great Lakes Mermaid ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Great Lakes
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    Be glad your p-valve came with instructions! My Light Monkey one didn’t!
     
  8. giovyledzep

    giovyledzep Angel Fish

    # of Dives: 50 - 99
    Location: Europe
    39
    14
    8
    The bit I quoted is listed under "When P-valve is NOT connected to diver"
    When it's connected they just recommend keeping it open as it can hurt the diver's genitals if it stays closed and the diver didn't urinate.

    This is so confusing. I don't really mind having to open the valve during ascent (although it's yet another thing to worry about), but then why would they say the system is watertight only when the valve is closed? That means I have to worry about purging the remaining air in the valve AND making sure there's enough pressure so I don't get a leak, all that while not even using the valve to pee. Pretty annoying.
     
    Lorenzoid likes this.
  9. Lorenzoid

    Lorenzoid idling in neutral buoyancy

    # of Dives: I just don't log dives
    Location: Atlanta, USA
    9,186
    5,743
    113
    Ah. It seems I was just pointing out the obvious.

    I have no idea what they mean.
     
  10. giovyledzep

    giovyledzep Angel Fish

    # of Dives: 50 - 99
    Location: Europe
    39
    14
    8
    No worries. I’ll figure it out one way or another.
     

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