1) Introduction:
The first eccentric, shaft deviated from the centerline of sealing face.
The second eccentric, shaft deviated from the centerline of pipe and valve.
The third eccentric, the distinctive included angle between oblique taper angle of eccentric seat and centerline of pipes, thus making the seat ring during the whole process of open and close. This structure not only uses cam effect, but also eliminates the possibility of abrasion and leakage.


The zero leakage of our triple eccentric butterfly valve is implemented by the composite stainless steel sealing ring mounted on the disc. Replacement to high performance butterfly valves and other types of valves, easy and flexible installation.


2) Characteristics
Elastic property of composite metal sealing ring to perform zero leakage.
Torque seal to ensure persistent two-way zero leakage.
The design of right-angled rotation with zero friction is implemented by the distinctive triple eccentric principle, It eliminates the friction between the seat and sealing ring in 90 rotation.
STL one-piece hard-surface seat may adapt to many working conditions, which is featured by long service life and easy maintenance.
One-piece cast (sheet welded) body, face- to- face dimensions conforming to ISO 5752, ASME B16.10 and API609. 
Intrinsical fireproof property due to all metal structure and leak-tight structure.
Anti-blowout stem for high reliability, completely conforming to API609.
The valve position indicator on the stem and the flange mounted at the top are in favor of the indication of disc position.
The stem of triple eccentric butterfly valve is a shaft, stem and disc are connected by pin-key combination.