| 摘要 |
Separated air flow in the neighborhood of the leading edge of a butterfly valve plate in a throttle body fuel injection system can result in whistling. To alleviate the noise, a provided with an recess, or relief, on the suction side of the butterfly valve plate, near the leading edge. The recess has sides that are substantially radial lines starting at the outer periphery of the valve plate and extending toward the center of the valve plate. At their centermost ends, they are connected by a substantially straight line running parallel to the axis of rotation of the butterfly valve plate. |
