Device for controlling the supply of a fluid to a system allowing fluid consumption to be optimised

1. Device to control the supply of a fluid from a source under pressure to a system, comprising:

a supply inlet for the fluid under pressure,

a discharge outlet for the fluid under pressure, a reaming connecting the supply inlet and the discharge outlet, said discharge outlet having a given cross-sectional area, and

a valve comprising a plug installed free to slide in said reaming and bearing in contact with a valve seat formed in the reaming in a closed state, said valve also comprising several opening states after a first phase in which the plug separates from the valve seat, each opening state corresponding to a different range of fluid pressure values, the cross-sectional area between the plug and the reaming of each opening state being different from the cross-sectional areas of the other states, at least one of these opening states having a cross-sectional area such that it regulates the fluid flow at the discharge outlet and at least one of these opening states having a cross-sectional area such that the flow is regulated by the cross-sectional area of the discharge outlet.

2. The device according to claim 1 , in which the open state with a cross-sectional area such that the flow is regulated by the cross-sectional area of the discharge outlet is the open state for which the range of pressure values includes the highest pressure values.

3. The device according to claim 1 , in which the reaming has increasing cross-sectional areas starting from the valve seat along the direction of fluid flow.

4. The device according to claim 1 , in which the reaming comprises a first portion forming the valve seat, at least one second portion that together with the plug delimits a cross-sectional area smaller than the cross-sectional area of the discharge outlet and a third portion that together with the plug delimits a cross-sectional area larger than the cross-sectional area of the discharge outlet, said first, second and third portions being arranged in this order along the direction of fluid flow.

5. The device according to claim 4 , in which the reaming comprises several second portions, said second portions being arranged along the direction of fluid flow such that together with the plug they delimit increasing cross-sectional areas along the flow direction.

6. Device to control the supply of a fluid from a source under pressure to a system, comprising:

a supply inlet for the fluid under pressure,

a discharge outlet for the fluid under pressure, a reaming connecting the supply inlet and the discharge outlet, said discharge outlet having a given cross-sectional area, and

a valve comprising a plug installed free to slide in said reaming and bearing in contact with a valve seat formed in the reaming in a closed state, said valve also comprising several opening states after a first phase in which the plug separates from the valve seat, each opening state corresponding to a different range of fluid pressure values, the cross-sectional area between the plug and the reaming of each opening state being different from the cross-sectional areas of the other states, at least one of these opening states having a cross-sectional area such that it regulates the fluid flow at the discharge outlet and at least one of these opening states having a cross-sectional area such that the flow is regulated by the cross-sectional area of the discharge outlet,

in which the reaming comprises a first portion forming the valve seat, at least one second portion that together with the plug delimits a cross-sectional area smaller than the cross-sectional area of the discharge outlet and a third portion that together with the plug delimits a cross-sectional area larger than the cross-sectional area of the discharge outlet, said first, second and third portions being arranged in this order along the direction of fluid flow, and

in which the second portion has a cylindrical portion and the third portion has a tapered portion.

7. The device according to claim 6 , in which the reaming comprises several second portions, said second portions being arranged along the direction of fluid flow such that together with the plug they delimit increasing cross-sectional areas along the flow direction.

8. The device according to claim 4 , in which the at least one second portion together with the plug delimits a variable cross-sectional area.

9. The device according to claim 5 , in which the at least one second portion together with the plug delimits a variable cross-sectional area.

10. Cooling system for at least one piston of an internal combustion engine comprising at least one cooling spray jet and the device according to claim 1 , said control device being located between the source of fluid under pressure and the at least one spray jet, the discharge outlet being formed by a free end of the spray jet.

11. Cooling spray jet for a piston of an internal combustion engine comprising the device according to claim 1 , said device being included in the body of the spray jet, the discharge outlet being formed by a free end of the spray jet.

12. The device according to claim 1 , wherein the valve prohibits fluid flow at the discharge outlet for a range of fluid pressure values below a minimum pressure value.