| 摘要 |
A flow control valve, especially for use in controlling the operation of a steam turbine, includes a valve seat arranged in the interior of a valve housing, and a diffusor arranged downstream of the valve seat, as well as a valve member which is mounted in a valve member guide toward and away from the valve seat to accordingly throttle the flow of steam or a similar medium through the interior of the valve housing and into the diffusing channel of the diffusor. Minimization of alternating forces tending to excite the valve member into oscillating and stabilization of the flow of the medium in the channel disposed downstream of the valve seat are achieved by the provision of internal ribs within such a channel. At least three such ribs are provided, projecting at least substantially in the respective radial directions or parallel thereto from the surface bounding such channel. The ribs commence at the area of smallest flow-through cross section of the channel and extend therefrom substantially parallel to the axial direction into the upstream portion of the diffusing channel. The axial length of the ribs is preferably in the range of between 1 and 1.5 times the diameter of the channel at the area of the smallest flow-through cross section. The free inner ends of the ribs are spaced from one another, and a cylindrical holding sleeve may be arranged therebetween and connected thereto.
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