88736766 (21 98+)




Metal expansion joint

rubber expansion joints


absorbing vibration and unwanted movements in pipelines and ducts


Rotary equipment in pipelines such as pumps, compressors, fans, turbines, etc. creates vibrations to the pipelines/ducts due to their performance which causes noise, fatigue, early depreciation of the pipelines/ducts, structures and other equipment that can sometimes have severe and irreversible consequences.
The use of rubber expansion joints is a proper solution to prevent vibrations from spreading to other parts of the pipeline. Rubber expansion joints are widely applied in suction and discharge sections of pumps/compressors and turbines to absorb vibrations and neutralize shock and water hammer. Rubber expansion joints have considerable application for applications where fluid and/or environment contain corrosive substances including seawater and a variety of acids and bases. This feature distinguishes such joints from metal expansion joints. However, their range of pressure and temperature tolerance is lower than that of metal joints.
In some cases, rubber joints are used to prevent electrical conductivity and induction of galvanic corrosion.
Here are some of the industries that use rubber expansion joints:

  • HVAC
  • Chemical industries
  • Marine industries
  • Utility industries
  • Food industries
  • Steel industries
  • Oil, Gas and Petrochemical industries

Types of rubber expansion joints made at IIVCO

  • Small-sized joints: These joints are manufactured in multiple sizes (from 1.25 to 12 inches) under the brand of BL-72, ASA, and Mahar-e Dogholoo (Twin). These parts are made using rubber (Bladder) and metallic layers (linings) and are cured with electric heaters.
  • Large-sized joints: These joints are made in multiple sizes (from 1.25 to 140 inches) under the brand of Autoclave joints. These joints are made using internal metal linings and cured in autoclave using steam generated by boilers.
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Benefits of rubber joints:

• Resistance to fatigue and failure in consecutive cycles
• Resistance against vibration and fatigue
• Reversibility against deformation
• Resistance to electrical stresses
• High flexibility against impact and shock
• High mobility and flexibility at low distances
• Coincident axial and lateral movements
• Sound absorbing capability
• No need for gaskets and seals
• Reduction in heat loss
• Deformation capacity at low power and consequently imposing low-power to equipment
• Low weight and ease of installation and replacement

Technical Specifications:

Rubber expansion joints are manufactured using compound raw materials for a variety of operating conditions (various temperatures, pressures, fluids, and ambient conditions). The specifications of each joint are explained in detail in the catalog..




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