| 摘要 |
On the side of the valve port (9), tori (5, 6), preferably in the form of frustoconical shells, are arranged, bearing on the sealing faces (1, 2) of valve body (3) and valve seat (4). The tori (5, 6) between them enclose an angle in such a way that the annular aperture formed between valve body (3) and valve seat (4) when the valve is opened is shaped in the manner of a Laval nozzle, in that the cross-section of this annular aperture between the sealing faces (1, 2) narrows towards the tori (5, 6) and then widens out again between the tori (5, 6) as the distance from the sealing faces (1, 2) increases. <IMAGE>
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