Patent ID: 8028863

Claim:
A fluid dispenser member comprising a dispenser wall ( 23 ) defining an outside surface ( 231 ) and an inside surface ( 232 ), said wall ( 23 ) having a dispenser orifice ( 24 ) passing therethrough, connecting the inside surface to the outside surface, the inside surface ( 232 ) forming a sealing slide-cylinder ( 233 ) for a piston ( 3 ) that is suitable for being displaced, from a rest position, along an axis X in said cylinder and with leaktight contact, so as to open an outlet valve ( 25 , 35 ), said piston ( 3 ) forming a portion of a fluid chamber ( 20 ) in which fluid is selectively put under pressure and flows through the open outlet valve towards the dispenser orifice, the piston forming a closure wall ( 34 ) that is suitable for closing the dispenser orifice ( 24 ) in the rest position, the closure wall ( 34 ) being positioned, in the rest position, over the dispenser orifice ( 24 ) beside its inside surface ( 232 ), the closure wall ( 34 ) coming into leaktight contact with the inside surface ( 232 ), the dispenser member being characterized in that, at the dispenser orifice ( 24 ), the inside surface ( 232 ) slopes relative to the displacement axis X of the piston ( 3 ), and the closure wall ( 34 ) of the piston ( 3 ) slopes in a manner that substantially corresponds to the inside surface ( 232 ), so as to create a cone-on-cone contact.