Why is the Triple Offset Butterfly Valve Designed with Three Eccentrics?

The triple offset butterfly valve is an industrial control valve that achieves sealing through three geometric offsets. The core feature is the non-concentric layout of the valve stem, valve plate and sealing surface. Its design goal is to solve the friction loss and high-temperature sealing failure problems of traditional butterfly valves.

So why is it necessary to superimpose triple eccentrics?

Single eccentricity can only achieve partial disengagement from friction. The triple design can form a progressive effect. The first eccentricity guides disengagement, the second eccentricity optimizes the contact path, and the third eccentricity provides a self-tightening seal. The lack of one of the three will lead to insufficient sealing force or residual friction under high temperature and high pressure, and it will not be able to meet the zero leakage standard.

The structure of the triple offset butterfly valve separates the rotation trajectory and the sealing surface, so that the metal sealing ring only undergoes elastic deformation at the moment of closing, avoiding long-term wear. Compared with the single eccentric valve body that relies on the packing clamping force, the triple eccentric relies on the geometric structure itself to achieve sealing reinforcement, significantly improving pressure resistance and service life.