Butterfly valve with flow straightening

Valves and valve actuation – With selective flow regulation – Rotary

Reexamination Certificate

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Details

C251S305000

Reexamination Certificate

active

07744061

ABSTRACT:
A butterfly valve comprises a valve shaft placed across a flow passage and a plate-like valve element provided on the valve shaft so as to be rotatable about the valve shaft to regulate a flow rate of fluid in the flow passage. The valve element has a section that gradually decreases in thickness from the valve shaft toward an outer edge in a direction nearly perpendicular to the valve shaft. The valve element further includes a plurality of inclined surfaces on each side so that the corresponding inclined surfaces on both sides of the valve element are identical in section in a direction parallel to the valve shaft. The valve element is provided on each side with a plurality of flow straightening ribs each extending in a direction perpendicular to the valve shaft and inclining along each inclined surface.

REFERENCES:
patent: 2986373 (1961-05-01), Masheder
patent: 3096071 (1963-07-01), Fisher
patent: 3684239 (1972-08-01), Schwartzbart et al.
patent: 4243203 (1981-01-01), Mack
patent: 5160118 (1992-11-01), Stary
patent: 6354267 (2002-03-01), Kotchi et al.
patent: 6354567 (2002-03-01), Vanderveen et al.
patent: 6412752 (2002-07-01), Daly et al.
patent: 6824119 (2004-11-01), Conley et al.
patent: 6901942 (2005-06-01), Krimmer et al.
patent: 6923157 (2005-08-01), Torii et al.
patent: 2004/0051071 (2004-03-01), Ando et al.
patent: 2005/0109971 (2005-05-01), Sano et al.
patent: U 1-60080 (1989-04-01), None
patent: A 11-173432 (1999-06-01), None

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