| 摘要 |
A floor-cleaning machine ( 10 ) has a chassis ( 12 ) that is mobile on a surface and carries an agitating mechanism ( 14 ) to engage the surface. A fluid delivery system ( 18 ) conveys fluid from a reservoir ( 16 ) to the surface proximate the agitating mechanism ( 14 ). The fluid delivery system ( 18 ) includes a flow control valve ( 20 ) having a body ( 24 ) and a flow control member in the form of a ball ( 22 ) constrained within the body ( 24 ) and rotatable about an axis. A first passage ( 30 ) and a second passage ( 32 ) are defined in the ball ( 22 ), with the second passage ( 32 ) having a cross sectional area smaller than a cross sectional area of the first passage ( 30 ). The ball ( 22 ) is pivotable between a high flow position and a low flow position. In the high flow position, the ball ( 22 ) is positioned to allow fluid flow from a upstream duct ( 26 ) to a downstream duct ( 28 ) through the first passage ( 30 ). In the low flow position, the ball ( 22 ) is positioned to allow fluid flow from the upstream duct ( 26 ) to the downstream duct ( 28 ) through the second passage ( 32 ). The fluid flow rates in the high and the low flow positions are each distinct and repeatable with adjustment of the ball ( 22 ), with the low flow position allowing a lesser fluid flow rate than the high flow position.
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