| 摘要 |
<p>A high differential pressure control valve having a plurality of stages of high resistance ports (41,43) forming a high resistance passage and one or more low resistance ports (51) forming a low resistance passage in a cage. The number of stages of low resistance ports is smaller than that of the high resistance ports so that a fluid at the side of an inlet passage (12) is introduced into the high resistance passage under a low open degree range and into both the low resistance passage and the high resistance passage under a medium and a high open degree ranges. <IMAGE></p> |
