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Pantographic Linkages

METALLIC PANTOGRAPHIC LINKAGES EXPANSION JOINT

An advanced expansion joint system equipped with pantographic linkages that evenly distribute movement across multiple bellows, improving performance and reliability in large-scale installations.

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Pantographic Linkages

expansion joint

The Metallic Pantographic Linkages Expansion Joint integrates a system of pantograph arms that mechanically link two or more bellows. This ensures synchronous movement distribution, preventing overloading of individual bellows convolutions. The design is especially useful in long piping runs or duct systems with large movements, where uniform load sharing enhances fatigue life and operational safety.

  • Size Range (DN)

    DN50 – DN5000

  • Materials

    SS304 / SS316L / SS321 / Inconel / Hastelloy / others on request

  • Movements

    Axial, Lateral & Angular (distributed across bellows)

  • Pressure Rating

    Up to 100 bar (higher on request)

  • Temperature Range

    –196°C to +800°C (depending on material)

Pantographic Linkages

expansion joint

The Metallic Pantographic Linkages Expansion Joint integrates a system of pantograph arms that mechanically link two or more bellows. This ensures synchronous movement distribution, preventing overloading of individual bellows convolutions. The design is especially useful in long piping runs or duct systems with large movements, where uniform load sharing enhances fatigue life and operational safety.

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  • Size Range (DN)

    DN50 – DN5000

  • Materials

    SS304 / SS316L / SS321 / Inconel / Hastelloy / others on request

  • Movements

    Axial, Lateral & Angular (distributed across bellows)

  • Pressure Rating

    Up to 100 bar (higher on request)

  • Temperature Range

    –196°C to +800°C (depending on material)

Typical use case: Primarily used in large duct systems and long pipeline runs where multiple bellows are installed, ensuring uniform distribution of axial or lateral deflection.

Other applications include:

  • Power plants (boiler ducts, turbine exhausts)
  • Petrochemical and refining units
  • Steel, cement, and glass industry ducting
  • Industrial process piping with high thermal movements
  • Pantograph arms ensure synchronized movement between bellows
  • Prevents over-stressing of individual convolutions
  • Extends fatigue life of bellows assemblies
  • Ideal for long-stroke or multi-bellows systems
  • High resistance to corrosion, fatigue, and temperature fluctuations
  • Reduces anchor loads by distributing forces evenly
  • Available in custom configurations to suit duct or pipe layouts
Pending
Pantograph Linkage Arms

mechanically balance movement across bellows

Flow Liners / Sleeves

protect bellows from erosion and turbulence

External Covers

shield bellows from environmental damage

End Connections

weld ends, flanges, or custom duct interfaces

Support Frames

for large duct applications