Butterfly-valve assembly having an admission passage of progressively-changing shape, and method of manufacturing same
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United States of America Patent
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Dec 20, 1994
Issued Date -
N/A
app pub date -
Mar 22, 1994
filing date -
Aug 21, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The butterfly valve assembly comprises a body formed with an admission duct and a disk shaped butterfly valve member of predetermined shape carried by a shaft that extends transversally to the passage and mounted for rotation in the body between a minimum opening position of the valve member and a maximum opening position. The duct has a cylindrical length whose cross-section matches with the shape of the butterfly valve member when the latter is in its minimum opening position. It further has respective zones upstream and downstream from the cylindrical length, along the paths followed by upstream and downstream edges of the valve member up to a determined opening angle thereof. Such zones are further defined by successive circular arcs centered on the axis of the admission duct and having radii that decrease going away from the cylindrical length along the axis.
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