A rotary joint, also referred to as a rotary union or rotating union, is a rotary sealing device that connects rotating equipment to fixed piping for the transfer of steam, water, thermal oil, coolant, hydraulic oil, air, and other media.
Transferring media without leaks requires the proper sealing technology. The sealing technology used depends on process speed, pressure, temperature, and media.
Types of Sealing Technology
DuraSeal™ Elastomeric O-Ring Seals
Lighter duty applications
Work well at low speeds and temperatures
Balanced Mechanical Seals
Sealing force increases only slightly as pressure increases
Extended seal life and reduced torsional loads
Pressure Mechanical Seals
Heavy duty applications
Spring force and fluid pressure push a seal ring against a polished metal or ceramic surface
Sealing force and load increase with pressure
Rotary joints mount directly to a rotating shaft
Mounting Methods
Externally Supported
Mounted with a bracket, lug, or other external support
Robust to thrust, side, and torsional loading
Requires a mounting surface
Self-Supported
Mounts directly to a rotating shaft
Easily adaptable to install
Susceptible to side loading
Requires anti-torque rods or piping to prevent rotation
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