We have oring seal on butterfly valve disc. Flow push oring outside its groove.
there nay construction solution to solve and void this problem?
valve is used with water at max 6 bar
in the valve is generated quite hi velocity ...about 1,5 mxsec
I didn't see the o-ring sealed butterfly valve on plate. Is it the structure same as tri-eccentrical one?
what are the current groove shape and o-ring material & section?
I believe there is a proper geometrical design and material selection capable of preventing extrusion of the seal... try also consulting o-rings Manufacturers catalogues and asking the question on the forum819: Mechanical Seal engineering within this site.    
I think that the valve in object is most probably a "standard" or high-performance butterfly valve (i.e. with no more than two off-sets), as the triple-offset rotary valves are usually metal seated (and then disc gasket is a metal spiral wound one). 

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