TechnologyRotary Union - Basic Components, Applications, and Dimensions

Rotary Union – Basic Components, Applications, and Dimensions


When the two parts are united together, a Rotary Union is used. Its function is to provide a seal between the stationary supply passage and the rotating part. Fluid can then flow into the rotating part. Rotary unions are widely used in a variety of applications. This article will discuss the basic components, applications, and dimensions of a rotary union. If you are interested in purchasing a Rotary Union, read on! There are many benefits to a rotary union!

Rotating union

A rotary union is a pipe connection that allows two parts to rotate together. This piece provides a seal between the stationary supply passage and the rotating part, allowing fluid to enter and leave the rotating part. Rotating unions are generally used for pumps, valves, and other fluid-filled devices. It can be used in many different industrial applications, including chemical production and food and beverage processing. A rotary union has several advantages. Here are some of them:

One of the main benefits of rotary unions is that they are highly flexible. While a straight hose may have sufficient flexibility, it can become rigid when fully charged. This is due to the weight and temperature of the fluid media being transferred. Rotating unions should not be twisted to avoid degradation of flexibility. Furthermore, extreme bends can shorten the life of the hose. Torsion loading can also reduce the rotary union’s service life. Properly installed hoses are vital for avoiding sharp beads, which can be a potential hazard.

Basic components

The Basic components of Rotary Union are the ring, nut, and shaft, and can be found in different sizes. These components will determine the type of system the rotary union is used for. A rotary union is used in vacuum, pressure, or variable pressure systems. It operates at speeds up to 10,000 rpm, and its inside diameter will determine its nominal diameter. A rotary union is also known as a “slip ring” if it is used for electrical signals.

The rotary union is usually made of several different materials, and can have more than one passage. This allows it to handle different media types and rotational speeds. Some rotary unions are made with more than one passage, while others are designed with a single passage. A multi-passage rotary union is important for systems with more than one media seal. This type of rotary union will provide additional protection for the hose by providing multiple points of pressure.


The operating parameters for a rotary union depend on the specific application. Operating pressures and temperatures can range from 0 to 20,000 psi and from -150 to 400°F. The speed can be low, or high, depending on the design and fluid. There are several options for fluid media in a rotary union, from water to oil to coolant and anything in between. There can also be as many as ten different flow passages within the rotary union. In addition to operating parameters, the design of a rotary union depends on its seals and other materials that are compatible with the fluid and the environment.

The basic components of a rotary union consist of a stationary housing and a rotating shaft. The housing supports the rotating part and is supported by radial bearings. They are commonly made with fully sealed deep groove ball bearings. If the speed or pressure of the media being transferred is low, a larger number of passages will be required. Lastly, a rotary union can be custom-designed to meet the specific requirements of a specific application.


The dimensions of a rotary union are important when you are selecting one for your application. Depending on its purpose, a rotary union may be installed at the end of a rotating shaft or around it. It will be used in vacuum and pressure systems. During installation, be sure to consider the usual media pressure and maximum operating pressure. Maximum operating pressure is best for variable pressure systems. Regardless of how you plan to use your rotary union, you should consider the following dimensions before purchasing one.

When choosing a rotary union, keep in mind that the dimensions and other features will depend on the application. A standard rotary unit may have the same dimensions as a custom-made one, but they can be customized for a specific application. For example, a rotary union with a coaxial shaft can be used in the car wash industry. A rotary union may have a slowing motion to control the speed of the media, which makes it ideal for cleaning equipment.

Sealing surfaces

A rotary union enables fluids to pass through it while lubricating the surfaces of the engaged seals. This is advantageous as non-lubricating media can cause rapid seal wear. Furthermore, a dry running cycle can seriously damage seal members. Therefore, lubricating the seals surfaces is essential for their long-term performance. Here’s how to maintain proper seal engagement in your rotary union. In the first place, always ensure that the medium is lubricated before introducing them into your equipment.

The design of a rotary union is critical for ensuring a good media transfer. The material used for the seals should be resistant to wear, and fillers should be used to reduce friction. Dynamic surfaces should have smooth surface finishes to reduce the risk of scoring. Proper sealing is essential to ensure adequate media transfer and maximize the life of your rotary union. The following are some tips to consider when designing a rotary union seal.

Wear resistant materials

Rotating unions are used to convey various media such as water, thermal oil, compressed air, and coolants. The unions almost always have mechanical seals to ensure leakproof operation. Although rotating unions are made of highly resistant materials, their functionality also puts them under wear. As such, the service life of a rotary union depends on a number of factors, including the type of material used and its finish. Listed below are some of these factors.

Rotating unions require drainage. Rotating unions should be installed with drainage laid downwards. In addition, they should be mounted horizontally with a drain vent pointing downwards. If drainage is not guided properly, the union may flood and become unusable due to its reduced performance. This can also result in an improper operating mode. To prevent this, it is essential to install proper drainage. Wear resistant materials are recommended for all parts, including rotors.

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