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  • Users: rtcsp
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  1. rtcsp

    Compatibility with Class 125 Thru-Bolted Flanged Butterfly Valve

    Are all Class 150 flanges compatible with a Class 125 thru-bolted butterfly valve, where the valve does not have thru-bolt holes? Obviously, I'm asking about flanges with the same NPD as the valve. If not, what determines which Class 150 flanges are compatible with the butterfly valve, since no...
  2. rtcsp

    Pressure Rating versus Reverse Pressure Rating?

    I understand what Pressure Rating is. What is Reverse Pressure Rating or Minimum Pressure Class? Can a fitting have two different values of Reverse Pressure Rating, as is the case with the Pressure Rating of a relief valve?
  3. rtcsp

    Pressure Rating versus Reverse Pressure Rating?

    I understand what Pressure Rating is. What is Reverse Pressure Rating or Minimum Pressure Class? Can a fitting have two different values of Reverse Pressure Rating, as is the case with the Pressure Rating of a relief valve?

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