| 摘要 |
An apparatus for selecting a flow rate of a fluid includes a barrel including an output port and a plurality of input ports; and an axle disposed substantially concentrically within the barrel. A plurality of drain channels are formed in an outer surface of the axle, each drain channel having a depth less than a thickness of a wall of the axle. The axle is rotatable within the barrel to provide one of a plurality of flow paths between one of the plurality of input ports and the output port, each flow path at least partially defined by at least one of the drain channels. |
