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Twin Sphere Expansion Joint

RUBBER TWIN SPHERE EXPANSION JOINT

A flexible molded rubber joint with a twin-sphere design, offering greater deflection capability and lower spring rates than single-sphere joints. Ideal where higher flexibility is required in compact piping layouts.

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Twin Sphere

expansion joint

The Rubber Twin Sphere Expansion Joint is constructed with two adjacent spherical arches of reinforced elastomer. This geometry provides increased movement absorption, reduced stiffness, and improved vibration/noise damping compared to single-sphere types. Typically supplied with floating flanges or clamped ends, twin-sphere joints are suited for piping systems requiring higher flexibility in shorter lengths.

  • Size Range (DN)

    DN25 – DN600 (larger on request)

  • Materials (Elastomer)

    Natural Rubber, EPDM, Nitrile, Neoprene, Hypalon, PTFE-lined on request

  • Reinforcement

    Nylon tire cord with steel wire

  • Movements

    Greater Axial, Lateral & Angular deflection vs. single sphere

  • Pressure Rating

    PN10 – PN16 (higher on request)

  • Temperature Range

    –20°C to +120°C (up to +150°C with special elastomers/PTFE lining)

Twin Sphere

expansion joint

The Rubber Twin Sphere Expansion Joint is constructed with two adjacent spherical arches of reinforced elastomer. This geometry provides increased movement absorption, reduced stiffness, and improved vibration/noise damping compared to single-sphere types. Typically supplied with floating flanges or clamped ends, twin-sphere joints are suited for piping systems requiring higher flexibility in shorter lengths.

  • Size Range (DN)

    DN25 – DN600 (larger on request)

  • Materials (Elastomer)

    Natural Rubber, EPDM, Nitrile, Neoprene, Hypalon, PTFE-lined on request

  • Reinforcement

    Nylon tire cord with steel wire

  • Movements

    Greater Axial, Lateral & Angular deflection vs. single sphere

  • Pressure Rating

    PN10 – PN16 (higher on request)

  • Temperature Range

    –20°C to +120°C (up to +150°C with special elastomers/PTFE lining)

Typical use case: Installed in tight piping layouts where maximum movement absorption is required within a short overall length, such as pump discharge lines and compact HVAC systems.

Other applications:

  • Chilled water and cooling systems
  • Desalination and water-treatment plants
  • Marine and shipboard piping
  • Power and process industries requiring vibration damping in short runs
  • Twin-sphere geometry provides higher movement capacity
  • Lower spring rate = reduced stress on equipment and supports
  • Excellent vibration, shock, and noise absorption
  • Compact design suited for restricted installation spaces
  • Multiple elastomer options available for varied service conditions
  • Long service life with minimal maintenance
Twin Expansion Joint
Flanges

carbon steel, galvanized, or stainless steel (standard or full-faced)

Control Rods

recommended to limit over-extension in high movement cases

Inner Liners & External Covers

for abrasive service or outdoor installations

Vacuum Support Rings

available for negative pressure applications

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