| 摘要 |
<p>A double offset butterfly valve comprising a valve body, a valve seat carried by the valve body, and a valve disc mounted on a shaft rotatably journaled in the valve body, the shaft being eccentric both to the centerline of the body and to the centerline of the valve disc (double offset). The periphery of the valve disc has a substantial knife edge which contacts the valve seat without rubbing. As the valve disc rotates, the knife edge remains out of contact with the valve seat until the knife edge contacts the seat at full closure.</p> |
