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The seal principle of hard Seal Butterfly Valve triple offset 
The Triple Offset Butterfly Valve provides a bi-directional bubble tight shut-off.This goemetry ensures that the disc seal contacts the body seat only at the final shut-off position without rubbing or galling,providing a torque generated resilient seal with sufficient"wedging" to ensure auniform seal contact.
The triple offset geometry OFFSET1 The shaft is offset behind the seat axis to allow complete sealing contact around the entire seat  OFFSET2 The shaft centerline is offset from the pipe and valve which provides interference free opening and closing of the valve   OFFSET3 The seat come axis is offset from the  shaft centerline to eliminate friction during closing and opening and to achieve uniform compressive sealing arount the entire seat.