Patent ID: 7922962

Claim:
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 ).