Rotary unions transport fluid from a fixed supply into revolving machinery. They are also known as rotating unions or rotary joints (certain models are also known as swivel joints).
The design of rotary unions considers the operating factors, such as the medium, the number of flow pathways, the temperatures, pressures, speeds, loads, and conditions.
Rotary Unions
Description
The following are included in the design of the leak-proof rotary unions:
- Mechanical seal rotary unions
Through a well-balanced mechanical seal design, mechanical seal rotary unions reduce seal wear, torque, and heat generation. Flatness needs to be kept within microns, and different seal materials need to be selected for varied media, speeds, and pressures. These unions work effectively even when subjected to simultaneous pressures of 150bar and 30,000rpm. Mechanical seal unions can be designed to respond differently depending on how the machine is being used.
- Hydrostatic(Gap seal) rotary unions
Rotating unions that use hydrostatic (Gap seal) technology rely on their exact tolerances to enable no-contact sealing at high pressures, extending life and requiring the least amount of maintenance. A fluid film is suspended on top of the rotating component and constantly circulates at a very low flow rate. These unions could be employed at high speed and pressure (6,000 RPM and 300 bar).
- Plastomeric rotary unions
Plastomeric rotary unions have seal components, sometimes known as “soft seals,” made of elastomers or polymers that are particular to the intended application. They work well in situations requiring high pressure at low speeds and sporadic rotation. This type of seal produces a lot of heat and wears quickly. These rotary unions are utilized in a variety of industries and are typically created with the use of many passages, high pressure, and low speed.
Normal transfer media include air, vacuum, gas, steam, water, thermal oil, hydraulic oil, coolant, and others.
- Swivel Joints
Swivel joints are a type of flexible piping connection constructed of carbon steel, stainless steel, or other materials. Typically, they are used for:
Systems with flexible piping to transport gases, liquids, and powders.
Injecting gases and liquids into rotating plant components.
Hose connections must be replaced with swivel joint scissors or balanced against stress brought on by bending or torsion forces.
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