Membrane for expansion tanks for reservoirs and autoclaves, and mold for making the membrane.

摘要

A membrane for expansion tanks comprises a distal neck (11) to be connected to an expansion tank and a hollow body (13) which extends from the neck and having, at a rest condition, at least an inwardly flexed portion (15) which can be outwardly flexed as a positive pressure differential is present between the inside of the hollow body and the outside environment in order to increases the operating volume of the hollow body. <IMAGE>