Do API 6D cover 1/2" reduced bore ball valve or covered dimension starting from 2"? Thank'you in advance to everybody shall answer me.

API 6D January 2002 / ISO 14313: 1999
Table 1 reflects minimum bores for full-open valves beginning with NPS 1/2 and ending with NPS 60.

Table 2 for face-to-face and end-to-end dimensions starts at NPS 2 and ends at different sized depending upon end flange type and class.  Subsequent tables begin with NPS 2.

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