| 摘要 |
<p>A central profiled body protrudes in an opening for outlet of gas from a compression stage. The outer axisymmetric surface of the profiled body is concave, of generally toroidal shape, and is terminated by a tip. The outlet opening of the compression stage is delimited by a curved surface forming, in the downstream direction, a widening providing, with the profiled body, a cross section for passage of gas which is substantially constant. A closure member seals the passage in the closed position of the valve.</p> |
