| 摘要 |
PCT No. PCT/FR98/00766 Sec. 371 Date Dec. 18, 1998 Sec. 102(e) Date Dec. 18, 1998 PCT Filed Apr. 16, 1998 PCT Pub. No. WO98/48204 PCT Pub. Date Oct. 29, 1998The invention concerns a butterfly valve for regulating a fluid flow rate in particular the air flow rate of an air distributor in an internal combustion engine fuel injector, and the method for making the valve. The valve (1) comprises a housing (2) traversed by a conduit (3) circulating the fluid wherein is provided a butterfly induction shutter (4) mounted on a control axis (5) perpendicular to the conduit axis. The invention is characterized in that it comprises a ring (6) co-axial with the conduit and set between the housing (2) and the induction shutter (4), the ring (6) being made of a material with good dimensional stability and the housing being molded around the ring in a material resistant to the imposed technical constraints and the ring (6) is so arranged that, when the shutter is in closed position, there still is a predetermined clearance between the ring (6) active inner surface (13) and the induction shutter (4) arranged to allow a minimal and time-constant fluid flow rate whatever the variations in humidity or temperature. The invention is applicable to internal combustion engine and any device requiring fluid flow rate regulation.
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