[Vortex Flowmeter VY Series] Why is the straight pipe lengths for reduced bore type as same as the general type?

Since the reducer shape and internal structure integrated with the vortex flowmeter are optimally designed, the additional straight pipe lengths are not necessary required for reducer pipe and expander pipe. Therefore, the required straight pipe lengths for reduced bore type is the same as that of the general type.
For details, refer to Vortex Flowmeter VY Series General Specifications (GS 01F07A00-01EN).

Please refer to the tutorial "Required Straight Pipe Lengths for Vortex Flowmeters".