Rotary Unions

//Rotary Unions

Rotary Unions

Rotary unions, also called rotating unions or rotary joints(some model also called swivel joints), transfer fluid from a stationary supply into rotating machinery.
Rotary unions are design for its application and consider the operating data as, medium, number of flow paths, temperatures, pressures, speeds, loads, and environments.



As design of the rotary unions’ leak proof structure include:

Mechanical seal rotary unions, minimize seal wear, torque, and heat generation through balanced mechanical seal desgin. Flatness must be controlled within microns, and according to the different speed, pressure, and media to choose different seal materials. These unions perform reliably even at pressures within in 150bar and 30,000rpm at the same time. Mechanical seal unions can be engineered to behave differently as the machine’s operating condition changes.

Hydrostatic(Gap seal) rotary unions, depond on its precise tolerances to provide no-contact sealing at high pressures, extending life and minimizing maintenance. The rotating part is suspended on a fluid film that circulates continuously with a very low flow rate. These unions could be used at high pressure 300bar and speed 6,000 RPM.

Plastomeric rotary unions, its seal parts also called “soft seals” made from application-specific polymers or elastomers. They are most suitable for applications with intermittent rotation and high pressure low speed. This kind of seal with much torque, heat generation, and wear rates. These unions usually are made with multiple passages application, with high pressure and low speed, and these kind of rotary unions are used in a wide range of industries.

The transfer media normally could be steam, water, thermal oil, hydraulic oil and coolant, as well as the air, vacuum and gas, etc.

Swivel Joints, is a kind of flexible piping components or piping couplings made of carbon steel, stainless steel or other materials as the operating data. It always used in:

Flexible piping systems have to transfer powder and granules, gases and liquids

Gases and liquids have to be injected into rotating plant components

Hose connections have to be balanced from stress caused by bending or torsion forces or replaced by swivel joint scissors

Because of the various models, so please contact us for the detailed information.

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