Valve with enhanced rangeability and logarithmic flow characteri

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

1991-07-26

1993-04-27

Rosenthal, Arnold

Valves and valve actuation

With selective flow regulation

251326, 251120, 251368, 137375, 137240, F16K 326, F16K 332

Patent

active

052055370

ABSTRACT:
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 has a cross section including a tapered slot portion which terminates in an apex defining an angle of from about 45 to 90 degrees and a rectangular base portion or a circular arc base portion subtending from 225 to about 270 degrees of arc. This shape provides valves of enhanced rangeability with a unique logarithmic flow characteristic which, for most flow rates, is intermediate to linear and equal percentage flow characteristics.

REFERENCES:
patent: 1090807 (1914-03-01), Warthen
patent: 1550725 (1925-08-01), Jung
patent: 1770717 (1930-07-01), Stremberger
patent: 1892260 (1932-12-01), Wick
patent: 3240466 (1966-03-01), Meyer
patent: 4331533 (1982-05-01), Dean et al.
patent: 4332674 (1982-06-01), Dean et al.
patent: 4336160 (1982-06-01), Dean et al.
patent: 4471942 (1984-09-01), Kocanowski
DeZurik Series C Knife Gate Valves, Bulletin 3:00-1, Oct., 1977.
Section 4 Appendix-Technical Data.

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