How to choose a rotary joint that suits you?
Rotary pressure joint is a unit to ensure the sealing between the fixed pipe and the feeding pipe and the rotary cylinder to ensure the heat transfer through the fluid medium or the rotating elements of the equipment. For heat transfer, the following fluid media are commonly used: steam, water, heat transfer oil, hydraulic oil, and cooling fluid media.
The process liquid in the rotary connection is sealed by a mechanical seal. Mechanical seal springs ensure contact between the sealing surfaces before the machine is put into operation and during operation due to hydraulic shock, except for low working pressures and vacuum conditions. Choosing the right mechanical seal is a key factor to ensure the effective operation of the Rotary joint, because if the mechanical seal fails, the fluid medium will begin to leak, which will usually greatly reduce the efficiency of the cooling or heating process. The swivel connection design allows easy replacement of the mechanical seal, which significantly reduces costs, which can occur when the process is inefficient.
The key criteria for selecting a rotary joint type are the application of the rotary joint and the type of fluid medium. In addition, as mentioned earlier, the rotary connection design also depends on the flow direction of the fluid medium. That is, whether the traffic is unidirectional or bidirectional.
When selecting a mechanical seal as a rotary joint, the characteristics of the fluid medium need to be considered. In terms of the temperature and chemical aggressiveness of the process liquid, the mechanically sealed graphite carbide / tungsten carbide seal surface combination is typically used for medium intensity operating conditions. In this case, it is recommended to seal the surface with silicon carbide. The graphite / silicon carbide sealing surface combination is the best choice for processes using hot oil as a processing fluid