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What are Three Eccentricities of Triple Offset Butterfly Valve?

What are Three Eccentricities of Triple Offset Butterfly Valve?

The traditional hard-sealing butterfly valve has no guarantee of sealing performance and may have a large leakage. In order to improve this situation, the hard-sealing butterfly valve has been reformed many times, and the triple offset butterfly valve has been born. The characteristic of triple offset butterfly valve is that the alloy material with high temperature and corrosion resistance is overlaid on the sealing surface of valve seat. It also fixes the multilayer soft laminated seal ring on the butterfly plate. This process makes the triple offset butterfly valve more resistant to high temperature, high pressure environment and corrosion than the traditional butterfly valve products.


Specifically, the advantages of adopting triple-eccentric structure of hard-sealing butterfly valve are as follows:

The unique design of three eccentricities makes the metal hard sealing more labor-saving. When the valve is opened and closed, there is no friction between the butterfly plate and the valve body during rotation. When the valve is closed, the increased torque of the actuator provides a compensating seal. These characteristics greatly improve the sealing performance of the triple offset butterfly valve and extend the service life of the butterfly valve.


What are three eccentricities of triple offset butterfly valve?

The first eccentricity is that the valve shaft is located behind the valve plate shaft, allowing the seal to fully surround the entire seat.


The second eccentricity is that the center line of the valve shaft deviates from the center line of the pipeline and the valve to avoid the interference of the opening and closing of the valve.


The third eccentricity is that the cone axis of the seat deviates from the centerline of the spindle. In this way, friction can be eliminated in the process of closing and opening, and uniform compression sealing effect around the whole valve seat can be achieved.


The above is about the introduction of the triple offset butterfly valve. The triple offset butterfly valve is a kind of high-performance butterfly valve, which has been applied in many fields. Even in some fields, it has replaced gate valve, globe valve, ball valve and other products.


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