Valves and valve actuation – Rotary valves – Butterfly
Patent
1994-03-22
1994-12-20
Fox, John C.
Valves and valve actuation
Rotary valves
Butterfly
123337, F16K 122
Patent
active
053740319
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.
REFERENCES:
patent: 4905647 (1990-03-01), Kizer et al.
MTZ Motortechnische Zeitschrift vol. 52, No. 3, 1 Mars 1991, Stuttgart, DE pp. 106-110, XP207774.
Friese 'der neue 2,0-1-digifant einspritzmotor im vw passat' p. 108, colonne 2, ligne 23--ligne 51; figures 4,5.
Pontoppidan Michael
Semence Pierre
Fox John C.
Solex
LandOfFree
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