| 摘要 |
<p>A valve comprises a valve housing, a first bearing sleeve defining an inlet passage, a second bearing sleeve defining a main outlet passage and a third sleeve defining a secondary outlet passage, all in the valve housing, and a generally spherical valve closure member co-operating with the sleeves, having a passage therethrough for connecting the main outlet passage with the inlet passage in an open position of the valve in which the secondary outlet passage is closed and having a recess extending from the valve passage for connecting the main and secondary outlets when the valve is in a closed position.</p> |
