Patent ID: 7367797

Claim:
A needle valve for filling a mold with an organic material in the liquid state, said valve including: a body ( 25 ) in which is formed a flow passage ( 30 ) for the material to be molded having an inlet opening ( 31 ), an outlet opening ( 32 ) and, between said two openings, a constriction ( 33 ) bounded on its upstream side by a change of section ( 34 ) forming a seat, and a needle ( 40 ) mounted in the body ( 25 ) so that it is mobile between a fully open position and a closure position closing the flow passage ( 30 ) with, between these two extreme positions, a range of intermediate positions of variable opening, said needle having a closure shoulder ( 43 ) adapted to bear in the closure position against the seat formed by the change of section ( 34 ) in the flow passage ( 30 ) in the body ( 25 ), so as to shut off the flow passage ( 30 ) and, projecting from said closure shoulder, an opening adjustment tip ( 42 ) that has a nonuniform section and is engaged in the constriction ( 33 ) to define a certain flow section therewith in each intermediate position of the needle ( 40 ), said opening adjustment tip ( 42 ) being distinct from said closure shoulder ( 43 ) and said closure shoulder ( 43 ) being shaped so as to contact said seat and close said valve about a quasilinear circular contact.