| 摘要 |
A control valve well-suited for controlling the flow of particulate solids comprises a valve body having a flow passageway comprising inlet and outlet passages extending transversely to a slide chamber. A plug member having a flow orifice is mounted for movement, within the slide chamber to seal the flow passageway when the flow orifice is out of registration therewith and to connect the inlet and outlet passages in flow communication when registered therewith. The flow orifice is of ovoid cross section, having in cross section a tapered slot portion which terminates in an apex subtending an angle of about 60 degrees and a circular arc base portion subtending about 240 degrees of arc. This shape provides a valve of enhanced rangeability with a unique flow characteristic which, for most flow rates, is intermediate to linear and equal percentage flow characteristics.
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