| 摘要 |
Fluid flow control valve, the valve comprising a valve housing (10) provided with a flow channel (12), which in direction from the inlet section to the outlet section, comprises a substantially conical inlet (13), a valve seat (14), and a diffuser (15) at the outlet section, which transfers into a flow channel (16). A needle-shaped spindle (11) is arranged axially movable within the flow channel (12) and exhibits a largest diameter DN. The inlet (13) exhibits a first conical inlet section (13′) having an angle α1 of 15° with the longitudinal axis of the flow channel (12), and a second inlet section (13″) with a radius of curvature R2 equal to 5.7 times the diameter DN of the spindle (11). The diffuser (15) is conical having an increasing cross-section in the flow direction by an angle α2 of 30° with the longitudinal axis in the flow channel (12). The design of the valve produces minimum erosion at the inlet section, and minimum cavitation and erosion in the diffuser section (15). |
| 主权项 |
1. Fluid flow control valve, said valve comprising a valve housing (10) provided with a flow channel (12), which in direction from the inlet section to the outlet section, comprises a substantially conical inlet (13) at the inlet section, a valve seat (14), and a diffuser (15) at the outlet section, which transfers into a flow channel (16) having a substantially uniform flow cross-section, wherein a substantially needle-shaped spindle (11) is arranged axially movable within the flow channel (12) and exhibits a diameter, at the end to be contacted by the valve seat, equal to or larger than the smallest flow cross-section of the valve seat (14), characterized in:
a) that the inlet (13) exhibits an inlet diameter D|N and comprises a first inlet section (13′) which is conical and exhibits an angle oil with the longitudinal axis in the flow channel (12) of 10-30°, and a second inlet section (13″) which is curved and exhibits a radius of curvature R2 in the range of 4.7-6.7 times the diameter DN of the spindle (11), b) that the valve seat (14) exhibits a diameter D0m that is 0.8-1.1 times the diameter DN of the spindle (11), c) that the diffuser (15) is conical having an increasing cross-section in the flow direction, and exhibits an angle a2 of 15-45° with the longitudinal axis of the flow channel (12), wherein the outlet channel (16) exhibits a diameter D0UT of about 2.4-4.4 times the diameter DN of the spindle (11), and d) that the radius of curvature Ri of the spindle (11) towards the apex, is within the range of 4.7-6.7 times the diameter DN of the spindle (11). |
