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.
- The inner diameter of a connected pipe is the nominal dimension of your system.
- Your installation's operating pressure: the rotary union gets utilized in both vacuum and pressure systems. You'll need to know the media's normal pressure as well as the maximum working pressure. Choose the maximum pressure as the operational pressure if the system works at variable pressure.
- The lowest and maximum temperatures will need to get determined. They usually range from -100°C to 200°C.
- The speed will be between 0 and 3,600 revolutions per minute. It's also possible to go faster than 10,000 rpm.
Some basic things to think about
- The device's physical dimensions in which it will get used
- Think about the rotational speed of the gadget.
- The PSI at which the media will pass through the machine
- Please refer to the part-by-part breakdown for selecting the best feasible rotary union for your application while considering these characteristics.