What are Three Eccentricities of Triple Eccentric 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 eccentric 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.

Structural design of triple eccentric butterfly valve.

• Eccentric design: The valve stem axis is offset from both the center of the disc and the center of the body, and the axis of the valve seat rotation forms a certain angle with the axis of the valve body passage, forming a triple eccentric structure.
• Multi-layer sealing structure: The valve seat adopts a multi-layer sealing, such as the sealing surface composed of soft and hard laminated stainless steel sheets and flexible graphite plates, which can effectively prevent medium leakage.

Working principle of triple eccentric butterfly valve.

The sealing surface of the disc and the sealing surface of the valve seat of the triple eccentric butterfly valve are not on the same plane. When the disc is closed, a wedge-shaped space is formed between the disc and the valve seat, enabling the disc to tightly seal the valve seat. Due to the eccentric design of the disc, the disc gradually disengages from the valve seat during the closing process, thereby reducing the friction between the disc and the valve seat and lowering the opening and closing torque of the valve.

What are three eccentricities of tri eccentric 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.

Specifically, the advantages of adopting hard sealing triple eccentric 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.

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.