Blowing plant comprising a nozzle provided with a lip sealing joint

A plant (10) for blowing a pressurized fluid into a blank (12), especially into a blank for a PET container, which comprises:

• a lower mold (12) which is intended to house the blank (12), and which comprises an upper horizontal wall (24) comprising an insertion orifice (28) through which an upper neck (16) of the blank (12) is intended to project;
• an upper nozzle (22) which comprises a lower outlet orifice (34) for the pressurized fluid which is intended to blow the pressurized fluid into the blank via the neck (16), and which comprises an annular seal (40) which is arranged under the lower circumference (44) of the outlet orifice (34);
• of the type in which the circumference (44) of the outlet orifice (34) is intended to be positioned opposite a bearing wall (18, 24) surrounding the neck (16) of the blank (12), the seal (40) being pressed against the bearing wall (18, 24) to prevent the pressurized fluid from leaking between the circumference (44) of the outlet orifice (34) of the nozzle (22) and the bearing face (18, 24),
• characterized in that the seal (40) comprises at least one first flexible annular lower lip (48) which extends radially toward the inside of the outlet orifice (34), so that the pressurized fluid presses on an upper face (54) of the lip (48) so as to pin the free inside circular edge (58) of the annular lip (48) against the bearing wall (18, 24) to ensure the sealing of the nozzle (22).