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Inside the Tekna Regulator

Discussion in 'Regulators' started by William Farrell, Oct 5, 2016.

  1. Fibonacci

    Fibonacci Manta Ray

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    524
    426
    63
    Nice work!
    I'm tempted now to resurrect my 2100B... I even had a stainless collar made up after my plastic one cracked like all the others but then ran out of other spares so its still in a shoebox somehere.
    Any idea on sizes for the various body o-rings?
     
  2. spoolin01

    spoolin01 Solo Diver

    # of Dives: 500 - 999
    Location: SF Bay Area, CA
    1,465
    189
    63
    I think both 1st and 2nd stages are standard o-ring sizes, at least that's what I've used. I didn't note the sizes, but I can check if you can't just match them up.
    When I finally move out of my garage, I'm expecting a bonanza.
     
  3. William Farrell

    William Farrell Angel Fish

    # of Dives: 50 - 99
    Location: La Selva Beach, CA
    22
    13
    3
    There are 3 o-rings, as shown below. Sizes are 22.7mm, 20.5mm and 9.75mm.

    tekna2.jpg
     
    Scubagaskets and Fibonacci like this.
  4. Fibonacci

    Fibonacci Manta Ray

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    524
    426
    63
    Thanks... o-rings are usually specified by ID x cross section.
    Not sure if Ralph Osterhout used Metric or Imperial sizes with Tekna?
    As a US company its likely the o-rings were specified to AS568 standard (much of SCUBA equipment was designed to this standard)
    AS568 Size Chart | Global O-Ring and Seal
     
  5. William Farrell

    William Farrell Angel Fish

    # of Dives: 50 - 99
    Location: La Selva Beach, CA
    22
    13
    3
    Going by that chart, the closest I get is (left to right in the pic above) 018, 017 and 010. Actual measurements were:

    .76 x .075
    .69 x .07
    .26 x .06

    Note: I only measured one set, and these are ~35 years old.
     
  6. spoolin01

    spoolin01 Solo Diver

    # of Dives: 500 - 999
    Location: SF Bay Area, CA
    1,465
    189
    63
    They're all 1/16" cross section. The small one is 011 if I recall, same as your reg hose ends. I can check the others tomorrow. There is one or two large ones in the purge housing as well.
     
    Fibonacci and William Farrell like this.
  7. Scubagaskets

    Scubagaskets Nassau Grouper

    160
    34
    28
  8. William Farrell

    William Farrell Angel Fish

    # of Dives: 50 - 99
    Location: La Selva Beach, CA
    22
    13
    3
    Sorry, I forgot about the purge assembly. There's one o-ring there, measuring 1.32 x .07. I believe it's number 027 in the AS568 chart, but I'll let the experts weigh in.

    tekna3.jpg
     
  9. William Farrell

    William Farrell Angel Fish

    # of Dives: 50 - 99
    Location: La Selva Beach, CA
    22
    13
    3
    It looks like I got lucky and measured them correctly at 018, 017, and 010, according to the chart below.

    tekna4.jpg
     
    Fibonacci likes this.
  10. Fibonacci

    Fibonacci Manta Ray

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    524
    426
    63
    The Tekna regulator design was granted US Patent 4,219,017 on August 26 1980... interestingly the two co-inventors listed are Ralph B Shamlian and John D Burr.

    Tekna 2100 US patent 4219017 detail.png

    Patent Images

    Patent Images
     
    William Farrell likes this.

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