| 摘要 |
<p>The stop-valve uses a rotor to control the flow and seal which rotates with the cock, the pressure of the water pressing the seal to the perimeter being blocked. The cock may be cylindrical and the seal may have a half cylindrical form matching the internal contours of the casing wall. The seal may comprise a half round rigid shell with a resilient liner bonded to its external surface.</p> |
