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Recent content by kokerkov

  1. kokerkov

    What is "Free length" of springs in safety relief vavles??

    Yes, our client insisted on adopting the first method, which is "free length" = delivered length. We are working on to persuade them to use the other one. That's why I seek help from professionals, you guys.
  2. kokerkov

    What is "Free length" of springs in safety relief vavles??

    We think we can meet both. Just with unclear test method. UG-136 is more clearly than newer 2023 version. So we can wait to see if our client's valves can get ASME certified?
  3. kokerkov

    What is "Free length" of springs in safety relief vavles??

    Thanks for the info. That is useful. Is 2017 version still valid? I cannot find same UG-136 in 2023 version. :( We did presets in our factory, but spring's length will be extending slowly after the preset. That's also why they said "measuring after 10 mins" If we test as ISO's method, doing 3...
  4. kokerkov

    What is "Free length" of springs in safety relief vavles??

    Yes, it is different. Let's say spring's free length is measured as delivered. Our springs will fail test. But as per ISO's method, we can pass. It is because spring's length will slowly extending after presets(yes, we did before delivering to client)
  5. kokerkov

    What is "Free length" of springs in safety relief vavles??

    It sounds silly. But it has a great effect on our product. Our springs cannot meet the requirement of “ASME BPVC 2023 Section XIII”, Part 3.2.5, which is : Where “original free length” is not defined, unlike ISO 4126-7： Our spring can manage to meet the ISO test, but our client said ASME...
  6. kokerkov

    Spring balancing using compression spring for telescopic up and Down

    Constant torque can be achieved using 'constant force spring', which is basically a roll of stainless steel strip. Rest types of spring only can offer constant torque rate per mm/degrees.
  7. kokerkov

    How can you compare with metals' ductility and malleability?

    Hi layman here, Background: We need some special cross section(semicircle) wire to produce cotter pins, and we found a workshop can do this using round wire. Surely by some kinds of pressing or rolling, I dont know exactly. And, we are providing raw materials(Inconel 625) to them. Question：...
  8. kokerkov

    I am not sure what this 'deviation table' means.

    Probably similar to those other coiling machine videos, I can take a short video if you like. We are going to produce this.
  9. kokerkov

    I am not sure what this 'deviation table' means.

    I think this means, we can use any length between 6.3-6.95 as nominal length, and apply +-0.4 tolerances to that nominal length. (There are no REF "B3,C1,B6" in the drawing. "9.1" and "6.0" are located in the other part of this drawing, where i didn't show on this pic.)
  10. kokerkov

    Anyone know about die spring color code(US version)?

    Thanks for the info.That is what I am looking for.
  11. kokerkov

    Quality Control Process for China

    There is something called AQL. If you are a QC staff, you should be familiar with this. --------------------------------------------------------------------------------------------------------------------------- I am Chinese from a Chinese factory. I am sharing my experiences dealing with our...
  12. kokerkov

    Anyone know about die spring color code(US version)?

    It seems US series have very close dimensions and specs as ISO 10243, only noticeable differences are colors and their classes naming. So in which standard these US die springs' color are specified, like in ISO 10243 ?? I cannot find such info.
  13. kokerkov

    Spring wire material replaceable?

    Spring is a simple torsion spring, having ~1.75 colis. Does not really matter. Original material is (ASTM A401)EN 10270-2 FDSiCr on the drawing. I want to use (A228)music wire to replace this. Is it a viable replacement? It doesn't seem to be valve spring.
  14. kokerkov

    angular tolerance in ISO 2768-1 for sheet metal process

    Thanks,sir. This is helpful.
  15. kokerkov

    angular tolerance in ISO 2768-1 for sheet metal process

    Grade is "M" in ISO 2768-1 Can you explain this a little? Why to use ISO 2768-1 is simple. They usually dont have such 'complicate' part, most of them are helical springs. So in most cases, ISO 2768-1 is enough. So they probably think it can cover all.
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