For automatic on-off valve(ball valve), should I test seat leakage according to standard ANSI FCI 70-2(similar with Globe control valve) or API-598 (similar to all type manual valves).

For on-off ball valves, use ASME B16.34 or API-598.  Only case I can think of for using FCI 70-2 (control valves) is if you happen to have a metal seated, characterized insert or other specialty ball valve that is designed to be used as a control valve.

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