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Recent content by Gray76

  1. Gray76

    Trunnion Ball Valve - Fire Safe Seat Design

    Thanks bcd, So the amount of compression will be key. I would also imagine that the seal density and scarf profile will also be critical?
  2. Gray76

    Trunnion Ball Valve - Fire Safe Seat Design

    Hi Gerhardl, I was referring specifically to fire tested valves - API 607 etc. Not sure about split O-Rings, never seen those before on a trunnion seat. I'm still none the wiser as to how a split graphite seal will hold pressure sufficiently to pass fire test. I supplose it is possible (on...
  3. Gray76

    Trunnion Ball Valve - Fire Safe Seat Design

    Hi, Many trunnion ball valve manufacturers show a fire safe graphite seal located in a closed groove on the trunnion seat carrier. As this is a closed groove, the graphite will have to be split/scarfed in order to fit. Maybe die formed ring or braided packing section. Does anyone know how this...
  4. Gray76

    Spherical Datum

    Hi, Thanks for your reply chez311. This is a typical drawing at a company I recently joined. It is not to any specific standard and many of the existing drawings do not have geometric tolerance. We certainly need to improve the drawings hence the question. Can you give me an example of how to...
  5. Gray76

    Spherical Datum

    Hi All, https://files.engineering.com/getfile.aspx?folder=c66ceef3-070b-44d2-b455-30a6d88222a7&file=BALL.pdf I'm looking for some help on the component sketch above. Over the years I've seen many different approaches and would like to finally bottom the issue. The component is a trunnion valve...
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