Patent ID: 7790097

Claim:
A method for blow molding containers, in which a blow mold is arranged on a blowing wheel ( 25 ) of a blowing machine, a preform is stretched inside a blow mold by a stretch rod after thermal conditioning and is blow molded into the container by the action of blowing pressure, and in which a first blowing pressure supplied by a low-pressure supply system is used first, and then a second, higher blowing pressure supplied by a high-pressure supply system is used, and the blowing air is supplied through at least one blowing air valve, and in which, after a container has been blow molded, at least a portion of the high-pressure blowing air is fed into the low-pressure supply system, wherein the return of blowing air to the low-pressure supply system is controlled by a return valve ( 47 ) connected in parallel with the blowing pressure valve ( 44 , 45 ) and that a valve outlet ( 50 ) of the return valve ( 47 ) is connected with the low-pressure supply system, the return valve ( 47 ) being connected in parallel with a vent valve ( 51 ) and in series with a check valve ( 48 ), the return valve ( 47 ) also being connected to a rotary bushing ( 58 ) via an intermediate reservoir ( 67 ), the rotary valve ( 58 ) coupling a stationary part of the blowing machine to the blowing wheel ( 25 ).