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  1. nssjvs

    Shell TAT/TAMAP list.

    I am manufacturing choke valves. I was trying for Shell TAT approval since last 2 years. Tried at Shell UK, Malayisa and India. I am yet to receive confirmation on that who will carry out TAT? It seems that very difficlut to initiate process on TAT approval.
  2. nssjvs

    Valve stem borken from sectional redcution

    AISI 410 ( hardness 200 HBW ) valve stem broken immeditaly from the point where achme thread start. It looks like shear cutting ( machine cut). Thread portion OD is 30 MM and seal area is 36 MM. it cut from point where 36 MM become 30 MM. what could be the probable reason ? is the diameter...

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