Rotary joint, also referred to as a rotary union or rotating union, is a rotary sealing device that connects rotating equipment to fixed piping for the transfer of steam, water, thermal oil, coolant, hydraulic oil, air, and other media。More than these，it also can transmiting power and signal etc.on 360 rotaring 360。
Rotary joint can be designed with multiple passages and manage multiple media types simultaneously. In these cases, a soft seal such as an O-ring is used to prevent the fluids from “crossing-over” into another passage. Soft seal multi-passage rotary joint are used in a variety of industries and applications including oil and gas, food and beverage, aerospace, robotics, and medical devices. In some applications, the rotary joint is fitted with slip rings for transmitting electrical signals as well as hydraulic power.
Applications of rotary joint： Many assembly lines incorporate multiple rotary joint, because they are highly versatile and take up less space than other devices designed for a similar purpose. Rotary joint also appear in automobiles and other machines that require constant supplies of lubrication, air, or other liquids in order for moving parts to run smoothly. Rotary joint are also heavily used in crude oil processing, the chemical industry, commercial food production, and pharmaceutical applications.
For example： Agriculture:Equipment used in grain harvesting including combines, tractors, grain carts and threshers employ rotary unions. Once harvested, many crops will be processed with equipment that uses rotary joint. Food processing equipment that use rotary joint include cooling conveyors, flaking mills, shredders, steam cookers, starch dryers, rotary cutters and roll-forming.