Triple-Offset Butterfly Valves: Benefits at a glance
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Triple-Offset Butterfly Valves: Benefits at a glance

Benefits at a glance:

  • Less cost
  • Less weight
  • Less space
  • Zero friction
  • Zero leakage
  • Why triple off-set?
    With deformation and friction being such a prevalent issue in the sealing capabilities of concentric and double-offset butterfly valves, the life expectancy is substantially minimized after its first operation and can be expected to pass media instantly.
    Through the revolutionary design and engineering of a Third-offset, there is now a solution to overcome these problems associated with deformation and friction – The benefits of a Triple-Offset Butterfly Valve…
    • The ‘cam action’ and ‘right angled conical sealing’ design ensures that the metal sealing components are never in contact until its final degree of closing, resulting in repeatable sealing and a vastly extended valve life.
    • Butterfly valves provide significant cost savings over conventional valves such as gate, globe and ball due to an inherent reduction in materials and weight.
    • Low torques result in low cost of automation.
    • Minimal maintenance due to the robust design with the added advantage of field replaceable seat and seal components in the TVT Range.
    • Low fugitive emissions due to quarter turn technology.
    • Cavities do not exist between sealing components in comparison to some conventional, concentric and double offset valves therefore eliminating the ingress of particles.

    • Metal to metal sealing allowing for higher pressure and temperature applications whilst still providing bubble-tight shut off.
    • Ideal for use in controlling or throttling applications.
    • Torque seated resulting in bi-directional, non-pressure aided frictionless seating.
    The design…The Evolution of Triple Offset:
    As the name implies, there are three separate “offsets” designed into
    thetriple-offset butterfly valve. Two of the offsets apply to the locationof the shaft in respect to the centerline of the bore and the centerlineof the disc / seat sealing surfaces.The third offset in the design is the axis of the seat cone angle thatis inclined from the centerline of the valve bore to minimise rubbingof the seat / seal contact surfaces during operation and to preservesealing integrity over the cycle life of the valve. This wide angle seatalso eliminates wedging or binding of the disc
     
    Zero Offset
    Concentric valve (zero offset). Disc rotates around the centre axis allowing for a potential 360º rotation. Sealing is achieved by the disc deforming the soft seal, resulting in full friction through the full operating cycle
    Double Offset
    To allow displacement of the seat, the shaft is offset from the centre line of the disc seat and body seal (offset one), and the centre line of the bore (offset two). This creates a cam action during operation to lift the seat out of the seal resulting in friction during the first 10 degrees of opening and final 10 degrees of closing.
    Triple Offset
    The third offset is the geometry design of the sealing components, not the shaft position. The sealing components are each machined into an offset conical profile resulting in a right angled cone (see Fig 1).
    This ensures friction free stroking throughout its operating cycle. Contact is only made at the final point of closure with the 90° angle acting as a mechanical stop; resulting in no over – travel of the disc seat.
    PRESSURE CLASSES
    Class 150 – 2” to 48”
    Class 300 – 2” to 48”
    Class 600 – 4” to 24”
    Double Block and Bleed Valves and Cryogenic Valves also available using Triple Off-Set Technology.

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