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ASME B16.34 Section 6.1.2

ASME B16.34 Section 6.1.2

ASME B16.34 Section 6.1.2

(OP)
I am working on a report for a class 3 valve and in reviewing B16.34 Section 6.1.2 to determine the minimum wall thickness required found the following, "the inside diameter d is taken as the minimum diameter of the flow passage but not less than 90% of the basic inside diameter at the valve end"  This seems counter intuitive to me, the larger diameter flow path would require a larger minimum wall thickness to withstand the stresses due to the internal pressure in the valve.  But the way I interperet the code is that the minimum diameter flow path determines the required wall thickness.  How can this be?

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