Other measures when the metal material can not fundamentally solve the problem, you can use the heat insulation approach. Fill different temperature-resistant heat insulation materials between the guide sleeve and bellows to avoid direct contact of high temperature medium with bellows, so that the medium heat is slowly transferred to the bellows, while natural or artificial cooling measures are taken outside the expansion joint to make the actual temperature of the bellows lower than the use temperature allowed by the bellows material. It is also possible to continuously pass steam or air with low temperature between the inflow sleeve and bellows.
