Ott-jakob rotary jointIt is a rotary sealing device that connects a rotating device to a fixed pipe for the transmission of steam, water, thermal oil, coolant, hydraulic oil, air and other media. Swivels can be designed to have multiple channels and manage multiple media types simultaneously. In these cases, a soft seal such as an O-ring is used to prevent the fluid from "crossing" into the other channel. Soft-seal multi-channel swivel joints are used in a variety of industries and applications, including oil and gas, food and beverage, aerospace, robotics, and medical devices. In some applications, swivel joints are equipped with slip rings to transmit electrical signals and hydraulic power.

For conventional rotary joints, spring-loaded seals are used to prevent the diffusion of fluid or gaseous media into the atmosphere. Springs are used in the swivel joints to keep the initial interior in place, and the swivel joints are pressure-sealed during operation. Low-pressure or vacuum services rely on spring forces to create a seal. Traditional swivel joints are either self-supported using internal carbon rails or externally supported using rods or mounting brackets.

Balanced sealed rotary joints are commonly used for fluid services (e.g. water, coolant, etc.), but can also be used for steam and other gases. The balanced seal technique relies on optimizing the spring pressure to create a positive seal inside the rotary joint. The working pressure of the medium has little, if any, effect on the sealing load. The balance seal is usually flat and the rotary joint is supported by a ball bearing.

Seals are the main wear parts of rotary joints and rotary joints. During operation, seals may experience internal loading from fluid pressure and friction from contact between sealing surfaces. Factors related to machine speed, temperature and the medium used can also affect the life of the seal ring. For the most part, swivel joints are only as good as their sealed packaging. Poor quality seals naturally wear out faster, resulting in increased maintenance, downtime and repair costs. When the seal fails, the medium will escape and the efficiency of the entire heating or cooling process will be affected. All of this makes the actual replacement cost of seals a fraction of the total cost of seal failure.

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