| 摘要 |
<p>A gate valve (11) has a body (13), the body having a cavity and a flow passage (15) intersecting the cavity. A seat ring (21) is mounted to the body at the intersection of the flow passage and the cavity, the seat ring having an engaging face (25). A gate (17) in the cavity has an engaging face that slidingly engages the face of the seat ring while being moved between open and closed positions. A friction-resistant coating is on at least one of the faces.</p> |
