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16100, 5.cd No: 13
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RJO – Rotary Joint

Rotary Joint (Rotary Connection Element)

A rotary joint is a mechanical connecting component used to enable the transfer of fluids (such as water, steam, oil, air, etc.) or gases to a rotating part within a fixed system. This component allows for both rotational movement and leak-proof sealing, ensuring continuous fluid passage. Widely used in industrial applications, rotary joints play a critical role especially in heat transfer, cooling, and lubrication systems.

For detailed information on Hidrofix Rotary Joint products, please refer to the technical datasheets.

İndirme Merkezi

Working Principle

Rotary joints typically operate on a rotating cylinder, drum or shaft that is connected to a fixed pipe system. Thanks to internal bearings, rotational movement is achieved while seals or sealing elements prevent fluid leakage. The fluid is generally transmitted through a central channel to the rotating part, ensuring a seal that can withstand the pressure and temperature within the system.

Standard Features:

  • Available with dual, quadruple, sextuple, octal, and twelve-channel flow options.
  • G 1/4 threaded connections are compatible with liquid distribution systems and all remote valve systems.
  • G 1/4 models are ideal for small single-acting systems and applications requiring slow return.
  • Products can be easily integrated via manifold connections or standard adapter components.
  • Optional slip ring (electrical rotary connection) support is available in certain models.

Sealing Feature:

  • These units eliminate the need for common drain or vent ports found in industrial models.
  • This design offers a long-lasting, leak-proof solution without the need for continuously operating pumps.

Structural Durability:

  • Units are equipped with integrated bearings that provide a long service life.
  • Quadruple models are usually integrated into machine covers and meet dual-path requirements.
  • Wide mounting holes and multiple piping options make these systems more user-friendly compared to traditional large industrial models.

Main Application Areas:

  • Paper industry (drying cylinders)
  • Plastic and rubber machines
  • Textile machinery
  • Food processing equipment
  • Chemical and petrochemical plants
  • Coolant transfer in CNC machines
  • Heat transfer in metalworking and rolling mills

Technical Specifications

Rotary joints are selected and designed according to various parameters:

 
Feature
Description
Operating Pressure
Typically 0–300 bar; may be higher for special applications
Temperature Range
Commonly -30°C to 350°C; thermal expansion is important in steam applications
Rotational Speed (RPM)
Varies up to 28 RPM (at 400 Bar)
Material
Options include brass, stainless steel, cast iron, carbon graphite, etc.
Seal Type
Common types: mechanical packing, carbon-graphite/stainless steel combinations
Connection Type
Flanged, threaded, or quick-connect adapters are available

Considerations When Selecting a Rotary Joint:

  • Type of fluid (steam, air, oil, etc.)
  • Operating temperature and pressure
  • Rotational speed and mounting position
  • Sealing requirements
  • Maintenance ease and bearing type
  • Single/double passage (single or dual-channel transmission)

Conclusion

Rotary joints are critical machine components that enable safe and efficient fluid transfer in rotating systems. Proper design and appropriate product selection directly affect system performance. Therefore, detailed analysis of application-specific requirements is essential to identify the most suitable rotary joint.