I was wondering if anyone can provide me with manufacturers (name, brand and location) of 4 offset Butterfly Valves - Quadruple Eccentric.

I had Literature of an European manufacturer, however i let a colleague borrow it and is lost. I don't remember the name ether.
I also tried searching on Google without success.

Zwick a german manufacturer does tripple offset, Bray does double offset I didnt know a quadruple offset existe.

I'm having a hard time imagining how there could be four eccentric motions in a butterfly valve, given the number of moving parts.

I could imagine there being four physical eccentrics, arranged as two pairs, at extremes of the disc and shaft.

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