Anyone knows the top three sellers for the butterfly valve in the world? How many competitors now in the USA and Euro.? Thanks for information. 

In the world of triple offset butterfly's  - aside from Vanessa as already mentioned, the other "Big Ones" in manufacturing are Tomoe-Tritech ( South Wales in the UK, .. and Headquartered in Japan ),  Solent & Pratt, who used to be a nice independent UK company and have now been swallowed up by the bigger Curtiss-Wright group,  and Orton SpA, based in Piacenza in Italy, and who are part of the FCx Group of companies.

The Far-East / Pacific Rim recent 'explosion' of manufacturer's have yet to really get their heads around TOBV's, both in 'design' and  especially when it comes to 'exotics' in material spec's, but rest-assured, they WILL get there, and probably very quickly.

When it comes to double-offset and standard 'rubber lined' butterfly's.. the world is literally one's oyster ... there are a multitude of companies manufacturing and distributing  - it all comes down to the old adage, " Ye pay for what ye get, my son "
   Its easy to get a hold of really cheap and cheerful equipment ( as it is in virtually every sphere of valves ) but some of them wouldn't hold back snow, never mind any form of pressure containment.
To summarise - its horses for courses..  consider your application and the media to which you wish to subject the valve to, with a thought being given to all the usual temperature / pressure / chemical resistance criteria, and select something thats "fit for purpose"

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