| 摘要 |
<p>A control valve comprises a valve body (10) having a flow passageway (16) comprising inlet and outlet passages (16a, 16b) extending transversely to a slide chamber (12). A plug member (24) having a flow orifice (36) is mounted for movement within the slide chamber (12) to seal the flow passageway when the flow orifice is out of register therewith and to connect the inlet and outlet passages in flow communication when registered therewith. One of the inlet passage and the flow orifice has a cross section including a tapered slot portion and an associated polygonal base portion or circular arc base portion. The other has a peripheral shape which includes a leading edge disposed substantially perpendicular to the direction of travel of the plug member. This arrangement provides valves of enhanced rangeability with a unique logarithmic flow characteristic.</p> |
