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Application of Rotary Joint

Rotary joints (also known as rotary unions, rotary swivels, or rotary couplings) are mechanical devices used to transfer fluid from a stationary pipe to a piece of rotating equipment. Rotary joints are used in rotary equipment to cool, heat or transfer fluid power. The fluid being transferred can be steam, heat transfer oil, coolants, hot water, hydraulic fluids, lubricating oils, or air, and the rotating equipment can be heat exchanger rolls, machine tool spindles, gear boxes, and air clutches.
Many rotary joints are designed to accomodate angular oscillation, or viberation that occurs because the rotating roll or drum os not perfectly aligned with the stationary fluid supply pipe. Some roptary joint designs also utilize cylindrical, carbon-graphite guide bearings.