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Pneumatic Double Eccentric Butterfly Valve

Category:Double Eccentric Butterfly Valve

        The pneumatic double eccentric butterfly valve is an improved version of the single eccentric butterfly valve. Its structural feature is that the axial center of the valve stem is offset from the center of the butterfly plate and the valve body. The double eccentricity effect allows the butterfly plate to quickly separate from the valve seat once the valve is opened. This minimizes unnecessary squeezing and scraping between the butterfly plate and the valve seat, reduces opening resistance and wear, and extends the valve seat's lifespan. At the same time, the pneumatic double eccentric butterfly valve can also use metal valve seats, which improves its performance in high-temperature applications.

Product Description:

Design features    >>>

1. Zero leakage: The manufacturing process ensures two-way zero leakage performance for the butterfly valve;

2. Anti-static structure: Conductive springs are placed between the valve stem, body and ball to avoid electrostatic ignition and ensure system safety;

3. The valve seat structure adopts automatic compensation design to ensure reliable sealing;

4. Double eccentric butterfly valve: The butterfly plate and sealing surface quickly separate, reducing friction, and making it suitable for high-frequency operation;

5. The fire protection design meets API607 and other industry standards for fire safety.


Application fields    >>>

Chemical industry ☼Petroleum industry ☼Environmental protection industry ☼Natural gas industry energy industry Steel plant smelting industry ☼Others


Execution standard    >>>

Design criteri:ASME B16.34

Structural length:API609GB/T 12221-2005

Inspection standard:API598、GB/T 26480

Connection standard:ASME B16.5、GB9113、JB79.1~4、HG20592、JIS B2220


Product parameters    >>>

Design features of high performance double eccentric butterfly valve    >>>


1. Capping: Adopting a balanced pressure root design to prevent the valve stem from coming out, balancing and compressing the seasoning to evenly seal it and prevent leakage. (See Figure ① above)

2. Pressure plate: does not contact the valve seat when opened, has no wear points, reduces torque, and requires relatively small actuator torque. (See Figure 2 above)

3. Insert: Low maintenance cost, easier disassembly and assembly, simply remove the insert to replace the valve seat. (See Figure ③ above)

4. Valve seat: Multiple sealing materials can be selected according to different working conditions. (See Figure ④ above)


Main components and materials    >>>