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Triple Eccentric Flange Hard Seal Butterfly Valve

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The triple-offset flange hard-seal butterfly valve is a high-performance industrial valve, widely used in many industries like petroleum, chemical, power, metallurgy, food, textile and papermaking. It can control the media flow in various industrial pipelines such as gas, air, steam, water, seawater and oil. Its design has a unique triple-offset structure where the valve stem axis is offset from the butterfly plate center and the valve body center simultaneously, and the valve seat's sealing surface forms an angle with the valve body passage axis. This structure offers the valve many advantages in the opening and closing processes.
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Triple Eccentric Flange Hard Seal Butterfly Valve


Technical Parameters

  • Nominal diameter: 2" ~ 60" (DN50 ~ DN1500)

  • Nominal pressure: 150LB ~ 900LB (PN50 ~ PN160)

  • Applicable temperature: -46℃ ~ 538℃

  • Applicable media: water, steam, oil, gas, acetic acid, nitric acid and many other media.

  • Valve body materials: carbon steel, stainless steel, alloy steel, etc.

  • Driving methods: manual, pneumatic, electric, etc., which can meet the needs of automatic control under different working conditions.


Structural Features

  • Triple-offset design: The axis of the valve stem deviates from the center of the valve disc and the center of the valve body. Meanwhile, the center line of the sealing conical surface forms a certain angle of eccentricity with the center line of the pipeline. This design enables the valve disc to instantly separate from the valve seat when opening, and realizes sealing through the mutual extrusion of elastic or metal sealing pairs when closing. It effectively avoids the friction between the valve disc and the valve seat, reduces wear, prolongs the service life and also reduces the operating torque at the same time.

  • Hard-seal structure: It adopts the combination of metal hard seal or metal and elastic seal. The sealing surface usually uses wear-resistant and corrosion-resistant materials such as stainless steel and hard alloy, which has good sealing performance and can operate stably in high-temperature, high-pressure and corrosive environments to achieve zero leakage.

  • Multiple sealing rings: The valve disc is equipped with multiple sealing rings to enhance the sealing performance. It can maintain excellent sealing effect whether under low-temperature or high-temperature conditions, and at the same time improve the service life of the valve and the convenience of operation.

  • Bidirectional sealing function: It has the ability of bidirectional sealing. The installation is not restricted by the flow direction of the medium and the spatial position. It can be installed in any direction, making it more flexible to use.


Application Fields
It is widely used in industries such as petroleum, natural gas, chemical engineering, electric power, metallurgy, food, medicine, papermaking, water supply and drainage, and sewage treatment. It is used to control the flow of various media and shut off them, especially suitable for working conditions with higher requirements for sealing performance and service life.


Structural diagram:
Triple Eccentric Flange Hard Seal Butterfly Valve


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