Metering valve having an improved metering chamber

A metering valve for dispensing a fluid product, comprising a valve body (10) containing a metering chamber (20), said metering chamber (20) being defined by a chamber insert (40) and two annular seals, a valve seal (21) and a chamber seal (22), said chamber insert (40) comprising a cylindrical wall (49), an upper edge (41) cooperating with said valve seal (21) and a lower edge (43) cooperating with said chamber seal (22), a valve (30) sliding axially in said valve body (10) between a rest position and a dispensing position, to selectively dispense contents of said metering chamber (20), said valve (30) being urged towards the rest position by a spring (8) cooperating on the one hand with said valve body (10) and on the other hand with said valve (30), wherein said upper edge (41) of said chamber insert (40) comprises an annular cutout (45) formed on a radially inner side of said upper edge (41), in such a way that a width of said upper edge (41) in contact with said valve seal (21) is always the same for all widths of said cylindrical wall (49), wherein said metering chamber (20) has a variable volume defined by an axial dimension of said cutout (45);

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• wherein said lower edge of said chamber insert extends radially inwards by a flange which increases a contact surface with said chamber seal, said contact surface always being the same for all widths of said cylindrical wall.