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Some basic things to look at when choosing rotary union

A rotary union is a mechanical connecting mechanism that allows fluid to move from a stable to a rotational component of a machine and vice versa. The liquid or gaseous fluid transported through the system might be under pressure or vacuum.

A shaft, seals, bearings, and a body will make up a rotary joint. It maintains the movement of the fluid. It needs to be thoroughly sealed, so the mechanical lip or O-ring seal is essential. The names rotary union, rotary distributor, and rotary joint are all used by some manufacturers.
 

How to choose a rotary union?

You can select a rotary union based on various rotating characteristics of the system. The media for which the rotary union will get utilized is the first and most significant factor to consider. Gas, air, vacuum, water, oil, steam, cooling liquid, and so on may all be utilized with it. The presence of abrasive or corrosive substances should be taken into account when choosing materials that fit.

The size of your rotary union will be determined by the number of passes required, the rotating speed, the pressure in your installation, and the operating temperature. You'll need a rotary joint with a sliding ring if you need to convey an electrical signal or current in your arrangement.

The union's content is crucial. Depending on the type of fluid to get transported, you can select from steel, aluminum, brass, cast iron, or bronze. Then you'll have to determine if you want a male or female connection, a screw-in, a flange, welded on, or a direct connection. Standard rotary unions like wind turbine slip rings are plentiful, but many manufacturers also provide bespoke rotary unions with or without manifolds.
 

How to calculate the dimensions?

Rotary unions come in various sizes. Here are the significant considerations for determining the size of your goods.
  

Some basic things to think about

 

Part-by-part breakdown

First and foremost, consider the measurement. Thread type and passage size are other factors to consider. Material concerns might also be essential in some applications. Early on, you should also consider the sort of media. Some media can help to restrict the number of materials available. Food-grade rotary unions, for example, are constructed of stainless steel. You can find more information from here.