| 摘要 |
<p>A liquid flow-restriction device has a plurality of flow-restriction passages (8, 10, 14) connected to a common outlet (13). Each flow-restriction passage has a magnetically operable valve (2) having a valve member (3) movable between an open position and a closed position. The valves are operated by a common actuating element (15) selectively positionable with respect to the valve members to open the valves. The actuating element (15) is a permanent magnet. The device is simple and allows easy selection of a flow rate to a dilution dispenser.</p> |
