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What is the difference between a rotary joint and a rotary union?

A rotary joint is a type of mechanical coupling that allows for the transmission of torque and rotational motion between two shafts. It typically consists of two or more components that are designed to rotate relative to each other while maintaining a seal to prevent fluid leakage.

A rotary union, on the other hand, is a type of rotary joint that is specifically designed for high-pressure applications. It consists of two or more components that are sealed together to form a single unit, with a central bore that allows for the transmission of fluids or gases. pneumatic rotary union are often used in industrial processes where high pressures and temperatures are present, such as in chemical processing or pneumatic systems.

The terms "rotary joint" and "rotary union" are often used interchangeably, but they do have distinct meanings in certain contexts.
pneumatic and electrical rotary union
1.Rotary Joint:
Mechanical Connection: A rotary joint refers to a device that provides a mechanical connection for the transfer of media (such as fluids or gases) from a stationary source to a rotating component.

Common Applications: They are frequently used in machinery where cooling, heating, or fluid transfer is required during rotational movement, such as in rotary steam joints for industrial equipment or in rotating drums and rolls in various manufacturing processes.

Media Transfer: Rotary joints are specifically designed to handle the transfer of liquids, gases, or vapors between stationary and rotating parts while maintaining a sealed connection to prevent leaks.
pneumatic and electrical rotary union
2.Rotary Union:
Fluid or Gas Transfer: A rotary union serves a similar purpose to a rotary joint, enabling the transfer of fluids or gases from a stationary source to a rotating component. It facilitates the passage of different media types, including hydraulic fluids, air, water, coolant, and more.

Broad Range of Applications: Rotary unions & Rotary Joint are utilized across diverse industries including manufacturing, machine tools, process equipment, packaging machinery, and other applications requiring continuous media transfer during rotational movement.

Versatility: They are often designed to handle a variety of media types and pressure ranges, accommodating different operational requirements.

In summary, while both devices facilitate the transfer of fluids or gases between stationary and rotating parts, the term "rotary joint" typically emphasizes the mechanical connection for media transfer, while "rotary union" often implies a broader applicability across various industries and media types. Despite these differences, the distinction can vary depending on context and specific industry usage.

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