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 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 .