The inner sleeve of the bellows expansion joint is also called the guide tube;
Function of the inner cannula:
Guidance: In some applications, the inner sleeve can direct the flow of media, reducing impact and wear to the bellows itself.
Prevent media erosion: For some corrosive media, the inner sleeve can protect the bellows from erosion and extend its service life.
Reducing turbulence: In high-speed flowing media, the inner sleeve can reduce turbulence phenomena and reduce noise and vibration.
anti-pull-off: In axial bellows expansion joints, the inner sleeve can prevent bellows from pulling off under extreme displacements.
Design considerations for inner casing:
Material selection: Select appropriate materials according to the nature of the medium to ensure corrosion resistance and temperature resistance.
Structural design: The length and diameter of the inner casing and the matching mode with the bellows need to be carefully designed to ensure the performance of the expansion joint.
Manufacturing Process: Including welding, forming and other processes to ensure the connection strength and sealing between the inner casing and the bellows.
Precautions for use:
Before installation, it is necessary to check whether the inner sleeve is placed correctly to avoid damage to the expansion joint due to improper installation.
Check the inner casing regularly for wear and replace if necessary.
For media containing solid particles, special attention should be paid to the maintenance of the inner sleeve to avoid clogging or abrasion.
If you have questions about specific models or application scenarios, please provide more detailed information so that I can give more specific suggestions.