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Flow Direction for Butterfly Valves
Flow direction/flow action for butterfly valves

I am an instrumentation engineer. I am working on Ammonia plant revamp project. i have a question regarding the data to be put in butterfly control valve datasheet. is it necessary to mention Flow direction/flow action for a butterfly control valve? I understand the above to are required for a globe valve as the action on plug, but is it applicable for a butterfly control valve?

Trim type in datasheet for a butterfly valve: will be double or triple offset?

If that is critical to the valve operation, a flow arrow will be a permanent mark on the valve body, and cerainly part of the vendor certified drawings.