| 摘要 |
<p>A gate valve including a valve body (1) having a bore there - through, a gate (4) moveable through the bore for blocking and unblocking flow through the bore, a moveable stem (5) coupled to the gate (4) for moving the gate (4) between a first position blocking flow through the bore and a second position not blocking flow through the bore, and a scraper (8) for scraping at least a portion of an outer surface of the stem (5) when the stem is moving for moving the gate (4).</p> |
