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What Are The Things You Need To Know About Rotary Union?

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Raju Kumar


Summary- Rotary unions are mechanical devices useful for rotating around an axis. They have important applications in different industries.


Rotary tables, robot arms, spindles, and spools are some common rotating components useful for a range of purposes. You may need to transfer air and liquids from a stationary site to a rotating part for heating, lubrication, and other purposes. In this case, you will find the task challenging. Other names of a rotary union are rotary couplings and rotary joints.

There is a sealing device attached to the rotary unions to connect the pipes to motion application. It helps in transmitting the thermal oil, coolant, water, and hydraulic oil. The device can endure any temperature conditions and pressure levels. You can continuously rotate the system in a single direction. 

A rotary joint has several components and configurations. You may also buy custom-designed models. But, the major parts include-

  • Bearings
  • Seals
  • Housing
  • Shaft 

Several industries take advantage of rotary unions. From the pneumatic rotary union, to the condensed rotary union, there are several options. The bigger models are useful for different sectors like energy and defense.

The hydraulic rotary union transfers the hydraulic fluid between the track base and cab. Based on the size and features, the rotating union may include multiple passages for media transfer. It can deal with different pressure levels and speeds.

Which rotating union will be the right choice for your purpose?

You can set some parameters to decide on the best rotating device for the desired application. You may use the machine for any media like steam and water. However, you have to focus on the fitting materials to ensure that they are resistant to corrosive agents. But, how many passages are essential for pressure and speed? The operating temperature helps in calculating the rotary union’s size. A rotary joint with an integrated slip ring is the right choice for users who need to ensure a smooth flow of electrical current.

Rotary unions and their technical details-

  • The operating temperature- To ensure a proper functioning of the device, you have to identify the lowest and highest temperatures. In most cases, it can be up to 200 degrees Celsius.
  • The standard diameter- You have to measure the connecting pipe to know about its internal diameter.
  • Operating pressure- You can use your rotary joints in both vacuum and pressure systems. Therefore, it is essential to detect the pressure level of the chosen media. It may range from 0 to 20,000 psi (0 to 1,380 bar). Some systems operate under different pressure levels. 
  • The direction and speed- The speed can be between 0 and 3,600 RPM. The speed can be between 0 and 3,600 RPM. However, some models have the highest speed limit of around 10,000 rpm.


You can now decide on the best rotary unions for your industrial needs.

Resource box-


Motion Technique is a platform where you can find a range of rotary devices. You will find modern devices for machining, packaging, and other purposes.


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