| 摘要 |
A butterfly valve with a seal face (4) having two opposite, essentially spherical sections (h, i) intersected by a symmetry plane (k) through the throttle which coincides with the torsional axis (j) of the throttle and two opposite, essentially conical sections (f, g) on both sides of the symmetry plane. The spherical and the conical sections successively merge into each other. When the throttle is revolved, the conical surfaces are pressed against a valve seat (18) shaped as a circular ring made of steel. This seat then assumes a more and more elliptical shape finally to adjust itself entirely to the elliptical mean line of the seal face.
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