As the titile and what is the benefit of this ( butterfly )valve?

Triple eccentric means:-

1)First eccentric is the offset between the shaft centre line and the disc trunnion centre line.

2)Second eccentric is the offset between the body centre line and the disc centre line.

3)The third and the most important is the eccentric in the sealing(multiple) itself such that if you draw a imaginary contour line between the sealing shape vs the body centre,It becomes a cone with one side flat on surface.(I hope my words are clear enough to make you understand).

The reason for this shape is because it gives better sealing ability for the valve.eg:- Fire safe valves are triple eccentric valves which are also called pyrogenic valves.The sealings are multiple in nos. and together they form a pyrogenic shape therefore this sealing is also called pyrogenic sealing.

Further to the triple offset (triple eccentric) butterfly valves, this geometry allows a valve construction with rigid sealing parts, i.e. metal seat which is inherently fire-safe, and cryogenic, and exhibits drop-tight (bubble-tight) sealing capability.
In other words, you can reliably seal a triple offset butterfly valve against high pressures and high temperatures. The valve can be constructed from materials that will hold tight continuously against hundreds of psi pressure at temperatures in the 1000 degrees F range...

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