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Pneumatic three-eccentric high-pressure butterfly valve

Pneumatic three-eccentric high-pressure butterfly valve

The three-eccentric centre butterfly valve refers to adding an angular eccentricity on top of the double eccentric structure, so that the sealing surface of the butterfly valve becomes an inclined conical shape. The outer contour of the butterfly plate is processed into an outer inclined conical surface, while the inner side of the valve seat is processed into an inner inclined conical surface. The sealing section of the butterfly valve becomes an elliptical shape, and the shape of the butterfly plate sealing surface is asymmetrical in the upper and lower directions. Due to the inclined conical shape of the sealing surface, the butterfly plate on the larger side is pushed upwards towards the valve seat along the large inclined curve, and the butterfly plate on the smaller side is pushed downwards towards the valve seat along the small inclined curve. The sealing ring of the butterfly plate and the valve seat do not rely on the elastic deformation of the sealing ring for sealing, but achieve sealing completely by the compression of the contact surface. Therefore, it can achieve full metal sealing.
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PRODUCT DETAIL

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The three-eccentric centre butterfly valve refers to adding an angular eccentricity on top of the double eccentric structure, so that the sealing surface of the butterfly valve becomes an inclined conical shape. The outer contour of the butterfly plate is processed into an outer inclined conical surface, while the inner side of the valve seat is processed into an inner inclined conical surface. The sealing section of the butterfly valve becomes an elliptical shape, and the shape of the butterfly plate sealing surface is asymmetrical in the upper and lower directions. Due to the inclined conical shape of the sealing surface, the butterfly plate on the larger side is pushed upwards towards the valve seat along the large inclined curve, and the butterfly plate on the smaller side is pushed downwards towards the valve seat along the small inclined curve. The sealing ring of the butterfly plate and the valve seat do not rely on the elastic deformation of the sealing ring for sealing, but achieve sealing completely by the compression of the contact surface. Therefore, it can achieve full metal sealing.

 

Product Characteristics

 

Valve body structure: The integrated casting valve body is easy to install.

 

Full-metal sealing: The sealing surface is welded with Stellite alloy, which is resistant to erosion and wear, and can be applied in various high-temperature and high-pressure harsh working conditions.

 

Valve bonnet extension structure: For high and low temperature media, a longer-neck valve cover is adopted to prevent the packing and drive mechanism from being affected by temperature.

 

Sealing performance: It can reach the highest level of ANSI/FCI 70-2 VI grade.

 

Bidirectional pressure-bearing: Both the inlet and outlet ends of the valve can withstand pressure, enabling installation without flow direction restrictions.

 

Independent valve seat: It can achieve bidirectional sealing. The design of replaceable valve seat and sealing ring ensures that the entire machine will not be scrapped due to sealing wear.

 

Three safety functions: fire prevention, anti-static, and valve stem anti blow out

 

Drive methods: pneumatic, electric, manual.

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