A blow molding machine for producing plastic bottles, particularly PET bottles, including a plurality of blow molding stations, which have assigned thereto valve blocks with control valves and blowing nozzles for introducing or discharging blowing air; and a cleaning-in-place (CIP) system for cleaning the blow molding machine. Since the valve blocks are configured such that they can be included in the CIP process, the system components, such as the blowing nozzle, which are particularly important for the production of PET bottles in terms of hygiene, can be cleaned and sterilized without disassembly.