A rotary joint which is also called rotary union or rotation union transfers media (oil, water, air, steam, fluid, coolant etc) from a stationary pipe to rotating cylinder or drum to allow the flow of heat transfer media in or out of the rotating roll. This equipment is used mostly in rubber, paper, printing, textile, chemical and plastic industries. Rotary joints are also used in machine tools, cranes and several other equipments. Heat conduction oil rotary joint is used to provide heating media like steam, hot oil, water to control the surface temperature of a drum, to move fluid or air to moving components.
Rotary unions come in multiple shapes and sizes and can have straight, dual, elbow and multiple ports. Custom designed rotary unions also come to suit the needs of equipment. Rotary joints with straight ports directly transfer the material through the joint and move in one direction; while dual joints let the fluid to flow in. Elbow ports, lead substances to move out at an angle and multiple ports allow rotary unions to manage different types of substances at the same time.
Rotary unions hold a variety of beneficial features. They are recognized as a device which has ability to endure a huge range of heat and pressure. In order to remain rust resistant, some joints are made from stainless steel. The use of ball bearings facilitates the movement of rotary joints smooth. They also necessitate seals that get old due to regular use and needs to be changed to ensure better functioning. Without rotary unions, damages that might happen to electrical lines and fluid transferring lines would not be avoided and these lines might face crack and twisting.
Some rotary joints work in a similar way. They are tapped into an input regulator joining it safely to a machine usually a manufacturing machine. The rotary union does not interrupt the function of the moving apparatus as it is designed to rotate together with the machine it connected to as the joint is capable to turn 360 degrees. Rotary unions can be used in different applications from semiconductor industry to larger industries.