| 摘要 |
A liquid flow restrictor in the supply line of an eductor or other dilution or dispensing device has a rotatably mounted disc (8) with opposite faces and a plurality of apertures or holes (8d), which provide different flow restrictions between the faces, and a pair of flow conduits (5, 5') sealingly engaging against the faces, whereby on rotation of the member (8) the zones are selectively brought into communication with the conduits (5, 5') to provide a desired flow restriction. <IMAGE>
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