Valve with enhanced rangeability and logarithmic flow...

Details Valve with enhanced rangeability and logarithmic flow... Valve with enhanced rangeability and logarithmic flow...

F - Mech Eng,Light,Heat,Weapons

16

K

137/139

F16K 3/26 (2006.01) F16K 3/32 (2006.01)

Patent

CA 1328792

ABSTRACT OF THE DISCLOSURE 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 cham- ber to seal the flow passageway when the flow orifice is out of registration therewith and to connect the inlet and out- let passages in flow communication when registered there- with. 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 character- istics.

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