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Double Eccentric Butterfly Valve

  • Design Standards: API 609, ASME B16.34
  • Test Standards: API 598
  • Pressure Ratings: Class 150, Class 300, Class 600
  • Nominal Diameter: 2″ to 80″ (50mm to 2000mm)
  • Face-to-Face Length: API 609
  • Temperature Range: -45℃ to 250℃
  • End Connections: Double flanged, wafer-type, lug-type

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Product Description:

The double eccentric butterfly valve is a valve with specific design features. Its basic parameters, structural characteristics, materials, rated pressure and diameter, seat materials, actuation methods, operating temperature range, leakage class, and application fields are described below:

Basic Parameters:

  • Design Standards: API 609, ASME B16.34
  • Test Standards: API 598
  • Pressure Ratings: Class 150, Class 300, Class 600
  • Nominal Diameter: 2″ to 80″ (50mm to 2000mm)
  • Face-to-Face Length: API 609
  • Temperature Range: -45℃ to 250℃
  • End Connections: Double flanged, wafer-type, lug-type

Structural Characteristics:

  • The double eccentric butterfly valve adopts a double eccentric design, where the centerline of the stem and the seat does not align with the centerline of the disc. This eccentric design reduces friction between the disc and the seat, improving the valve’s service life and sealing performance.

Body Materials:

  • Common materials include cast iron, carbon steel, stainless steel, etc., and suitable valve body materials can be selected based on different working conditions.

Rated Pressure and Diameter:

  • The rated pressure range of the double eccentric butterfly valve is typically between several tens of megapascals to several hundred megapascals, and the rated diameter ranges from several millimeters to several meters.

Seat Materials:

  • The seat of the double eccentric butterfly valve generally uses wear-resistant and corrosion-resistant materials such as polytetrafluoroethylene (PTFE) and ethylene propylene diene monomer (EPDM) to ensure excellent sealing performance.

Actuation Methods:

  • The double eccentric butterfly valve can be actuated by manual, electric, pneumatic, and other means, allowing for the selection of a suitable actuation method based on actual needs.

Operating Temperature Range:

  • The operating temperature range of the double eccentric butterfly valve is generally between -40℃ to +200℃, with the specific range depending on the choice of valve body and sealing materials.

Leakage Class:

  • The leakage class of the double eccentric butterfly valve is typically zero leakage or a sealed leakage class, ensuring excellent sealing performance in the closed state.

Application Fields:

  • The double eccentric butterfly valve is widely used in pipeline systems in industries such as petroleum, chemicals, pharmaceuticals, food processing, and water treatment to control the flow and pressure of media. Its reasonable design, compact structure, ease of installation and disassembly, convenient maintenance, and complete sealing and zero leakage characteristics make it an indispensable fluid control equipment in these industries.

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