Overview
Double eccentric hard seal butterfly valve is a valve type widely used in many industrial fields. Its unique structural design gives it significant advantages in performance and reliability.

definition and principle

The center of the valve shaft of the double eccentric hard seal butterfly valve has been offset twice, which deviates from the center of the butterfly plate and the center of the valve body channel. This structural design enables the butterfly plate to quickly separate from the valve seat when the valve is opened, which greatly reduces the scratching phenomenon between the butterfly plate and the valve seat, reduces the opening resistance, reduces the wear, and improves the service life of the valve seat. The butterfly plate is driven by rotating the valve stem to rotate in the valve body, so as to realize the flow control of the medium.

Structural features

1. Double eccentric design: butterfly plate axis relative to the center line of the valve body and valve seat sealing surface has two eccentric, this design reduces friction and wear, to achieve a reliable seal, and reduce the operating torque.
2. Hard sealing material: metal sealing or reinforced polytetrafluoroethylene (PTFE) sealing is usually used, which has good corrosion resistance, high temperature resistance and wear resistance.
3. Sealing performance: through the instantaneous contact or separation of the butterfly plate and the valve seat, zero wear and zero leakage are realized, which is suitable for various working conditions.
4. Simple operation: The design is simple and clear, the structure is compact, easy to install and maintain, and the operation is labor-saving and convenient.
5. Low fluid resistance: Due to the small contact area between the butterfly plate and the medium, the resistance of the fluid through the valve is also small, reducing energy consumption.

Application areas

Double eccentric hard seal butterfly valve is widely used in the following areas:

1. Petrochemicals: dealing with corrosive, high temperature and high pressure media, used in pipeline transportation and process control.
2. Electric power industry: stable operation in the water supply system and cooling water system of thermal power plants.
3. Water treatment: precise control of water flow to ensure the stable operation of the water treatment process.
4. Other industries: metallurgy, mining, paper, food and other industries are also widely used.

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