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  1. TKCHANG

    Control Valves in Helium

    GGOSCO, As you mention, i am intersted in you helium test method for control valve. I know that TUV test according to Ta-Luft. It's different from EPA 21. What's your test procedure?
  2. TKCHANG

    Shell SPE 77/312

    Hello, anegri as mention,where can i find the specification (the Shell MESC SPE 77/312 "additional requirement" specification )or buy it?
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