| 摘要 |
The present invention relates to a butterfly valve which can achieve a markedly increased fluid-tight sealing on the valve axle (20) by providing a sealing keeping movable ring (50) and roller pins (60) on the valve axle (20), in such a manner that the ring (50) is moved in the axial direction by means of roller pins (60) when the valve axle (20) is rotated to cause the valve disk (30) to close the flow path (11), to thereby press the part of the rubber seat ring (40) surrounding the through-hole (41) for receiving the valve axle (20), whereby the leakage of fluid through the hollow hole of the valve body (10) can be completely prevented under such a high fluid pressure. |
