| 摘要 |
<p>There is a close part rotating or reciprocating linearly between the upriver flow passage and the downriver flow passage in a valve. A sub passage mechanism is mounted in the upriver flow passage, which is arranged in a row or more rows along the motion direction of the close part. The sub passage mechanism divides the upriver flow passage into two or more sub passages. When the close part rotates or reciprocates linearly, the upriver surface will open or close respectively all of the sub passages in the valve.</p> |
