4 offset Butterfly Valves ( Quadruple Eccentric )

[UNSR60001]

Hi,

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.

Thank you in advance for your help on this.

 

[monaco8774]

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

 

[Ashereng]

Vanessa also makes a triple offset butterfly valve.

http://www.tycoflowcontrol-na.com/l...ebinator/search/pdfhi.txt?query=triple offset

What is the 4th offset? This is also new for me.

"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?

 

[MikeHalloran]

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.



Mike Halloran
Pembroke Pines, FL, USA

 

[NGiLuzzu]

UNSR60001,
it is only six years I'm in the valve business, but I've never heard about Quadruple Offset valve design, me too.

Whatever it is, to me it sounds like a fancy mistake or a marketing invention without much technical meaning...(?)



In any case, many good discussions have been carried out within this Forum about Triple Offset valve design already. See, for example:

- thread408-64692 about the type of design in general;

- thread408-145006 about advantages and disadvantages;

- thread408-135872 about the most important Manufacturers;

- thread408-141966 for a trouble-shooting case study;

- thread408-149142 about the control characteristic;

- thread819-149326 about the sealing mechanism.


To complete what mentioned by Ashereng, correct links for information about Tyco VANESSA are the following:

http://www.tycovalves-eu.com/brands_results.asp?Selection=Vanessa

http://www.vanessavalves.it

Hope this helps, 'NGL