| 摘要 |
A sealing hub assembly is provided for a valve having a stem boss and a stem rotatably received in the stem boss. The stem is normally rotated by a motor/actuator. To seal a leaking stem, a hub body is connected to the stem boss which is also used to releasably mount the motor/actuator. An adapter is threaded into the hub body. A stem extender is rotatably supported in the adapter which is coupled at a first end for co-rotation with the stem, and is coupled at a second end to the motor/actuator. To provide an external fluid seal for the leaking stem, a first seal is positioned between the stem extender and the adapter, and a second seal is positioned between the adapter and the stem boss.
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