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What reg is this? Help with leak.

Discussion in 'Do It Yourself - DIY' started by spoolin01, Aug 5, 2019.

  1. spoolin01

    spoolin01 Solo Diver

    # of Dives: 500 - 999
    Location: SF Bay Area, CA
    1,484
    199
    63
    I've had a chance to do some more testing, and while I still don't see what the fault is, I think I've narrowed it specifically to the turret seal itself. I took some pictures comparing this clone to the Apeks DST (DST is on right, or top, in all), though of themselves I don't know they show much. I took a number of measurements of the body, turret, and bolt assemblies - lengths, ODs, step distances - and while there are only a couple of differences that exceed a couple thousandth's, they make me think this is a copy, and not an actual rebranded Apeks.

    Here are the dimensional differences I could find:
    • the boss on the body that the 024 o-ring fits over is about .010 larger OD on the copy than the Apeks
    • the copy HP seat (white) is quite a bit longer, though there's no knowing (at least by me) that either seat is the proper part
    • the head flange of the turret bolt is significantly thicker on the copy (as is the plastic thrust washer)
    • I'm going from week old memory (risky at my age), but I didn't measure any differences in the turrets themselves, other than the inletting for the plastic ring on the copy
    Perhaps the most intriguing observations are these:
    • you can swap the entire copy version of the turret bolt and HP seat into the Apeks, and it seals fine, though IP is about 5psi higher.
    • if you try the converse, the Apeks turret bolt hits a hard stop the moment the threads engage. I've looked and measured, and I don't see the cause of this
    • swapping the Apeks turret onto the copy doesn't fix the leak, and for the life of me I think I swapped the copy turret onto the Apeks, but I don't recall now... damn!
    • swapping thrust washers doesn't fix the leak
    • with tank pressure of ~100 psi in a nearly empty tank (based on IP reading), the copy still leaks at the turret seam
    I take this last observation to truly eliminate anything going on with the HP seating as cause of the turret leak.

    Again, I can't spot any issues with the condition of the o-ring seating surfaces on the copy body or turret, and I've tried more than one fresh 024 o-ring (lightly lubricated). I'll take a second look at dimensions there to see if it looks like a proper gland is being created.

    Does anyone think gooping up the gland with grease might help? Haven't tried that yet... I can also see if I can find some slightly oversized cross-section metric o-ring to try. Otherwise, I think I'll be sending this back to the seller. The 2nd stage it came with seems like a decent working adjustable model, though I can't match it to any Apeks models with available information. The adjusting feature works by pushing a spring-loaded piston against the screw-end of an otherwise standard threaded poppet arrangement. I recall seeing a TUSA model that used this approach.

    P8060151.JPG P8060148.JPG P8060147.JPG P8060146.JPG P8060143.JPG P8060142.JPG
     
  2. spoolin01

    spoolin01 Solo Diver

    # of Dives: 500 - 999
    Location: SF Bay Area, CA
    1,484
    199
    63
    OK, well it turned out to be major operator error. The yoke bolt doesn't quite capture the 011 o-ring that creates the HP seal with the body, and it was damaged during initial installation. Absent that, the reg appears to seal as intended.
     
    Centrals and couv like this.

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