A procedure for thermal treatment of water with regeneration for flushing aseptic chambers of high-pressure homogenisers or pumps, wherein water or another suitable fluid is heated from a traditional supply temperature of about 15-20 °C to a sterilisation temperature of about 130- 150°, provides for the following steps: - maintenance of the sterilisation temperature for a time t from 0.2 s to 30s; - cooling of the sterile fluid by surrender of heat to a double-wall/plate heat exchanger (8), producing a corresponding pre-heating of the non-sterile fluid incoming to said exchanger (8); - flushing of the aseptic chambers of the homogeniser by means of the cooled sterile fluid. An apparatus that realises the procedure comprises, originally, a double- wall/plate heat exchanger.
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