The invention concerns an apparatus for blowing and filling a container (22) from a preform (16), said apparatus comprising:—a mould (12) for enclosing a preform (16),—stretching means for stretching the preform (16) placed within said mould (12),—a pressurized liquid injection circuit (18) able to inject a liquid under pressure inside said preform (16) when said preform is placed inside said mould,—injection means which are adapted to inject a predetermined volume of liquid through said liquid injection circuit (18) into the preform and to stop injection of the liquid through said circuit into the preform when a blown and filled container (22) has been obtained, stopping the injection of the liquid through the liquid injection circuit into the preform creating an overpressure of liquid within the liquid injection circuit, characterized in that the apparatus further comprises releasing means for releasing said overpressure of liquid within the liquid injection circuit.