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  • Users: ketrab88
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  1. ketrab88

    Concentricity on the thread - does it make sense when related to other holes ?

    Hi, Can someone help me solve onging discussion wihin Engineering dept. I enclosed the example of Concentricity marked on the thread realted to two smaller diameters located before the thread itself. I've been trying to find a standard which expressly explains if its according to GD&T rules...
  2. ketrab88

    Ball Vallve Calculation Design Handbook/Literatur.

    HI all, I am currently looking for a literature related to the Ball Valve design ( metal to metal & soft seated) ? But I am actually as well interested in Gate, Choke valves I've found so far this link to the calculation sheet, which is actually brilliant -...
  3. ketrab88

    Gas tight surface

    HI, I've been having a problem with gas tight valve. Two rotary parts. The surface on the cooperating parts Is Ra 0.03 Rz 0.7 - I thinkt hat it's too rough. Everything seems ok with water, but when we start testing it at 1000 bar Nitrogen, starts bubbling. I fiugred out now two solutions: 1)...

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