| 摘要 |
A control valve comprising a cylindrical hollow trim defining an inner bore extending along an axis between a first opening and a second opening, the first opening defining an inlet of the valve, the trim comprising a first outer cylinder extending along the axis and comprising a first plurality of radial through holes defining an outlet, a second cylinder, housed in the first cylinder and coaxial, the second cylinder comprising a second plurality of radial through holes, the holes of the first plurality being smaller and in greater number than the holes of the second plurality, for each hole of one of the first and second cylinders the projection along a radial direction on the other of the first and second cylinders being spaced from each hole of the other of the first and second plurality a plug sized to fit inside the bore and slidably movable along the axis. |
| 主权项 |
1. A control valve comprising:
a cylindrical hollow trim defining an inner bore extending along an axis between a first opening and a second opening, the first opening defining an inlet of the valve, the cylindrical hollow trim comprising: a first outer cylinder extending along the axis and comprising a first plurality of radial through holes defining an outlet of the trim, a second cylinder, housed in the first cylinder and coaxial therewith, the second cylinder comprising a second plurality of radial through holes; and a plug sized to fit inside the bore and slidably movable along the axis between a closed position proximal to the first opening and a complete open position proximal to as the second opening, through a plurality of partially open positions, wherein in the complete open position of all the holes of the first and second plurality of through holes are in communication with the inner bore and wherein in each of the partially open positions of only a respective portion of holes of the first and second plurality of through holes are in communication with the inner bore, wherein the holes of the first plurality are smaller in diameter than the holes of the second plurality, wherein the holes of the first plurality are in greater number than the holes of the second plurality, for each hole of one of the first and second cylinders of the projection along a radial direction on the other of the first and second cylinders is spaced from each hole of the other of the first and second plurality, wherein the cylindrical hollow trim further comprises a plurality of annular partition walls orthogonal to the axis and extending through an annular space from one to the other of the first and second cylinder in order to divide the trim into a plurality of levels axially distributed along the axis between the first and second openings, each of the levels defining one of the partially open positions. |
