| 摘要 |
<p>The present invention is directed to a sealing device for a rotary valve. The sealing device of the present invention comprises a bellows seal (6) sealingly disposed about a linearly displaceable actuator shaft (14) between a housing (30) and a linearly displaceable slide (17, 31) to which the actuator shaft (14) is affixed and upon which is carried a rack (4) for cooperation with a pinion (3) for driving a rotating shaft to move the valve closing element between its closed and opened positions. The sealing device of the present invention comprises the bellows sealing system (6) for cooperation with the rack (4) and pinion (3) to transform the linear reciprocating motion of actuator shaft (14) and rack (4) to rotary motion of pinion (3) and the rotating valve closing shaft and closing element. Actuator shaft (14) is inserted through the bellows (6) which provides static seals to flange (30) and bushing (31). The bellows sealing system may thus be employed with rotary valves where it avoids the necessity to use conventional packing or sealing rings which are prone to leakage and failure due to friction with the rotating actuator shaft.</p> |
