A. You are correct, there are different equations for reducers. The 2009 edition of the Crane TP-410 includes a new chapter, Chapter 3: Regulating Flow with Control Valves. This new chapter is based on the ANSI / ISA 75.01.01 standard, and as such, uses a different equation for the resistance (K) value of inlet reducers attached to a control valve than those used for pipeline reducers in Chapter 2 of the TP-410. Read Full Answer
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