Eccentric Butterfly Valves


In one of the article related butterfly valve types there are butterfly valve types mentioned like double offset and triple offset butterfly valve but I can’t make sense about these types of valves.

So can anybody explain me in detail about these types of valves? Or how it looks like from inner side of valve?

Or can anybody share datasheet or drawing of valve or provide video of design of these types of valves?

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Are you Referring the below article?