Metering valve for dispensing a fluid

1. A metering valve for dispensing a fluid, said metering valve comprising a valve body ( 10 ) and a valve member ( 20 ) mounted to slide relative to said valve body ( 10 ) between a rest position and a dispensing position, said valve further comprising a metering chamber ( 11 ) serving to contain the metered quantity of fluid discharged each time the valve is actuated, wherein, when said metering valve is in the rest position, said metering chamber ( 11 ) is at atmospheric pressure; and

wherein the valve further comprises a filling chamber connected firstly to a fluid reservoir and secondly to said metering chamber, a passageway between the metering chamber and the filling chamber being closed when the valve is in the rest position and in the dispensing position, said passageway being open when the valve moves between the rest position and the dispensing position.

2. A valve according to claim 1 , in which said filling chamber ( 12 ) is connected to said fluid reservoir when the valve is in the rest position, the passageway ( 16 ) between the filling chamber ( 12 ) and the reservoir being closed when the valve is not in the rest position.

3. A valve according to claim 1 , in which the metering chamber ( 11 ) fills when the valve member ( 20 ) moves from its rest position to its dispensing position.

4. A valve according to claim 1 , in which said valve member ( 20 ) is provided with a link channel ( 15 ) having an inlet ( 15 a ) and an outlet ( 15 b ) that is offset axially relative to said inlet ( 15 a ), said link channel ( 15 ) lying entirely within the metering chamber ( 11 ) in the rest position, lying entirely within the filling chamber ( 12 ) in the dispensing position, and connecting said metering chamber ( 11 ) to said filling chamber ( 12 ) when the valve member ( 20 ) is between its rest position and its dispensing position, said inlet ( 15 a ) then being disposed in the filling chamber ( 12 ), and said outlet ( 15 b ) being disposed in said metering chamber ( 11 ).

5. A valve according to claim 1 , in which the fluid contained in the metering chamber ( 11 ) is discharged when the valve member ( 20 ) reaches its dispensing position.

6. A valve according to claim 1 , in which a spring ( 25 ) urges the valve member ( 20 ) towards its rest position, said spring ( 25 ) being disposed out of any contact with said fluid.

7. A valve according to claim 6 , in which the valve body ( 10 ) further comprises a spring chamber ( 13 ) isolated from any contact with the fluid, the valve member ( 20 ) passing through said spring chamber ( 13 ), and the spring ( 25 ) being disposed in said spring chamber ( 13 ) around said valve member ( 20 ).

8. A valve according to claim 1 , in which the valve member ( 20 ) is provided with a central discharge channel ( 21 ) connecting the dispensing orifice ( 22 ) of the valve member ( 20 ) to an opening ( 23 ) opening that opens out into the metering chamber ( 11 ) when the valve member ( 20 ) is in the dispensing position, said opening ( 23 ) being isolated from said metering chamber ( 11 ) when the valve member ( 20 ) is not in the dispensing position.

9. A valve according to claim 1 , in which the valve body ( 10 ) comprises a spring chamber ( 13 ), a metering chamber ( 11 ), and a filling chamber ( 12 ), the spring chamber ( 13 ) being separated from the metering chamber ( 11 ) by a first transverse wall ( 31 ), the metering chamber ( 11 ) being separated from the filling chamber ( 12 ) by a second transverse wall ( 32 ), and the filling chamber ( 12 ) being separated from the reservoir by a third transverse wall ( 33 ), said valve member ( 20 ) sliding through said spring chamber ( 13 ), said metering chamber ( 11 ), and said filling chamber ( 12 ) between its rest position and its filling position, by passing in leaktight manner through said first, second, and third transverse walls ( 31 , 32 , 33 ).

10. A fluid dispenser device comprising a metering valve comprising a valve body ( 10 ) and a valve member ( 20 ) mounted to slide relative to said valve body ( 10 ) between a rest position and a dispensing position, said valve further comprising a metering chamber ( 11 ) serving to contain the metered quantity of fluid discharged each time the valve is actuated, wherein, when the valve is in the rest position, said metering chamber ( 11 ) is at atmospheric pressure; and

wherein the valve further comprises a filling chamber connected firstly to a fluid reservoir and secondly to said metering chamber, a passageway between the metering chamber and the filling chamber being closed when the valve is in the rest position and in the dispensing position, said passageway being open when the valve moves between its rest position and its dispensing position.