Method and apparatus for producing liquid-contents-filled containers from preforms by contents being introduced into the preform under pressure

An apparatus for producing a liquid-contents-filled container from a preform by introducing liquid contents into the preform inside a mold under pressure in a molding and filling station, the apparatus comprising:

• a pressure pump;
• a pressure accumulator;
• a displacement pump;
• and
• a filling valve;
• wherein the pressure pump and the filling valve are fluidly connected to one another, at least in part, by a supply line,
• wherein the pressure accumulator is arranged in the supply line between the pressure pump and the filling valve,
• wherein the displacement pump includes a filling chamber for the liquid contents,
• wherein a movably guided displacement body is provided in the filling chamber,
• wherein the displacement body divides the filling chamber into a first partial chamber and a second partial chamber,
• wherein a first connecting line leads from the pressure accumulator to the first partial chamber,
• wherein a second connecting line leads from the pressure accumulator to the second partial chamber,
• wherein the first partial chamber is fluidly connected to the filling valve via a communication path that does not include the pressure accumulator,
• wherein the displacement body includes a drive connection to a drive unit,
• wherein the apparatus is configured such that when the filling valve is opened, the displacement body is subjected at least temporarily by one or both of the drive unit and the pressure accumulator to a drive force that moves the displacement body within the filling chamber such that the displacement body displaces at least a part of a quantity of liquid contents required produce the liquid-contents-filled container in a direction toward the preform.