The relationship and differences between the nominal diameter of a valve and the seat diameter
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What do they mean respectively? How are they calculated? Are the two the same?
The nominal diameter of the valve is generally DN**. DN is the nominal diameter; it refers to the standard diameter used for various pipes and piping fittings. Tubes and piping fittings of the same nominal diameter can be connected to each other, offering interchangeability. It is not the actual outer or inner diameter of the pipe, although its value is relatively close to or equal to the pipe’s inner diameter. The valve seat diameter generally corresponds to the maximum flow diameter of the valve. The valve seat diameter is generally smaller than the nominal diameter of the valve
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