Hi,
Can anyone please confirm is it possible to have soft seat , Class VI leakage class in triple offset butterfly valve ?

 

Back in 2014, I looked at Quadax who had recently introduced a four offset valve that could allow for a replaceable PTFE o-ring seat. At that time, all triple offset valves were stellite seats, due to the wear factor inherent in the design. I haven't tracked that market/application since, but I doubt the triple offset design has gone to a soft seat.