Butterfly valve
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 6, 2004
Grant Date -
Mar 18, 2004
app pub date -
Jul 1, 2003
filing date -
Feb 26, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Provided is a butterfly valve that prevents occurrence of erosion, thereby rendering it possible to secure fine adjustment of a volumetric flow rate of a fluid in an area of low degree of valve opening or in an area of minute degree of valve opening, to infallibly attain high range ability. This invention provides a butterfly valve for opening and shutting an interior of an elastic seat ring 2 mounted in a cylindrical valve casing 1 by rotation of a disc valve member 3, wherein the butterfly valve comprises depressing valve parts 10 and 11 provided at least on an orifice side 8 of the valve member 3 and adapted to make depressing contact with the elastic seat ring 2 in the area of low degree of opening or in the area of minute degree of opening of the valve member 3, a void part 12 formed along an outer peripheral edge of the valve member 3 or at a downstream side position of the outer peripheral edge, and communicating parts 13 formed in the valve member 3 or the depressing valve parts 10 and 11 to establish communication from the void part 12 toward a downstream side.
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