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Piston vs Diaphragm Regulator

Discussion in 'Dive Right in Scuba' started by Aqua-Andy, Jan 8, 2017.

  1. Aqua-Andy

    Aqua-Andy Solo Diver

    # of Dives: 500 - 999
    Location: Southern NH.
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    522
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    I read this article from an email I was sent this morning. Good info except for this part.
    " Apeks diaphragm regulators are among the highest of quality. These first stages utilize a unique what they call “overbalanced” design. This means the intermediate pressure supplied to the second stage increases more than traditional balanced models as the diver descends to greater depths."

    This is not unique to Apeks regs, most other environmentally sealed diaphragm regulators have this "feature". Only it is not a designed in feature it is a "design flaw" that they try to market as a feature.
     
  2. Captain Swoop

    Captain Swoop Solo Diver

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    Why is it a design flaw?

    How does this follow from the thread title?
     
  3. Aqua-Andy

    Aqua-Andy Solo Diver

    # of Dives: 500 - 999
    Location: Southern NH.
    1,438
    522
    113
     
  4. Captain Swoop

    Captain Swoop Solo Diver

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    126
    43
    Bad link, I just get 404 not found but apart from that, why do you think it's a flaw not a feature?
    Apeks have been designing and manufacturing regulators for many years, they are highly regarded. I use them myself, I think they are good bits of kit, I don't see a flaw.
    What’s deceptive?
     
    Last edited: Jan 8, 2017
  5. tbone1004

    tbone1004 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
    15,934
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    deep diving regulators

    read up. it's possible to engineer around, but they've created a bit of a marketing term around it and it really is only a design flaw with unbalanced regulators and/or extremely deep depths. At the extremely deep depths it will cause them to freeflow if you don't detune the second stages for shallow water, and with unbalanced regulators it can cause WoB issues when you do that. Not just Apeks, most if not all sealed diaphragms are prone to it. The Poseidon Jetstream/Xstream regs aren't able to work with this extreme of an IP swing since they are a semi-upstream unbalanced design, so they have engineered their first stages to not require the sealing diaphragm for cold water
     
  6. Aqua-Andy

    Aqua-Andy Solo Diver

    # of Dives: 500 - 999
    Location: Southern NH.
    1,438
    522
    113
    I have read up, this page has been around for many years. This phenomenon of IP increasing is not desirable but does not cause issues unless you are diving very deep. I guess it just bugs me when marketing departments take a known issue and promote it as a "feature". I never said It was only an issue with Apeks I said "This is not unique to Apeks regs, most other environmentally sealed diaphragm regulators have this "feature"". It is just that Apeks actually promotes it.
     
  7. tbone1004

    tbone1004 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
    15,934
    7,300
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    @Aqua-Andy I was more responding to @Captain Swoop with that link. I would argue though that it may be enough to help offset some WoB hits due to gas density if you are diving light in the Helium department, but if you subscribe to standard gasses where your "ideal mix" is equating to 32% at 30m/100ft, then it is unlikely to be a meaningful benefit. Deep air, sure I can believe it's advantageous, but that would require promoting deep air diving, and that would be bad...
     
    Aqua-Andy likes this.
  8. Aqua-Andy

    Aqua-Andy Solo Diver

    # of Dives: 500 - 999
    Location: Southern NH.
    1,438
    522
    113
    Sorry, I guess I'm a little crabby today. We had a big storm come through and mess up the viz in the ocean so we scrubbed the dive for today. Earlier last week we had rain and forty something degree weather that melted a bunch of our snow. So no diving, no riding the sleds and it finally hit 16F outside. I guess I'm getting a little cabin fever.
     
    Captain Swoop likes this.

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