Zero leakage Triple-Eccentric Butterfly Valve Structure and Working Principle
The structure of the Zero leakage triple-eccentric butterfly valve is similar to that of traditional butterfly valves but differs in sealing ring materials and construction, disc shape and angle, and seat design. The triple-eccentric butterfly valve features an arc-shaped or spherical disc that forms an eccentric structure with the seat, creating an eccentric effect to achieve high-performance sealing. When the valve opens, the sealed annular space between the disc and seat disappears, reducing fluid resistance.
Working Principle
Zero leakage triple-eccentric butterfly valve operates by leveraging the eccentricity of the disc and friction between the blades to achieve sealing. When closing, the disc experiences lateral pressure, causing the blades to generate friction with the seat's sealing surface, ensuring tightness. When opening, the blades disengage from the seat, minimizing friction and facilitating fluid flow.
Specification
Design Standard: API609
Size Range: NPS1/2''-42'' (DN10-DN1200)
Pressure Rating: 150-600LB
End Connection: Wafer, Lug, Double flange
Operation: Lever, Gear, Electric, Pneumatic actuator
Detailed Explanation of "Triple Eccentricity"
The term "triple eccentricity" refers to the offset of the valve stem axis relative to the seat sealing surface in three directions: axial, radial, and angular eccentricity.
Axial Eccentricity: The rotation center of the disc is offset axially from the disc's sealing cross-section, reducing wear between the seat and disc during opening/closing.
Radial Eccentricity: The rotation center of the disc is offset radially from the pipe axis, improving sealing performance and reducing operating torque.
Angular Eccentricity: The valve stem axis forms an angle with the disc sealing surface (non-perpendicular), minimizing friction between the disc and seat sealing surfaces during closure.
These three eccentricities collectively enhance sealing performance and extend service life.
