| 摘要 |
A rotatable filter drum has a plurality of internal filter cells which orbit about the axis of rotation of the drum in an endless path in which they are alternately immersed into and emerge from a bath of liquid to be filtered. Suction means communicates with the cells for drawing liquid in form of the initial filtrate into the cells when the same are immersed, with concomitant buildup of a filter cake on the exterior of the drum in the area of the respective cells. Dispensing means dispenses a wash solution onto the cells when the same are emerged from the bath so that the wash solution penetrates the filter cake and enters into the cells as a wash filtrate. A leading and a trailing conduit communicate with each of the cells in the respective leading and trailing regions thereof for evacuating the initial and wash filtrate therefrom. Control valve means defines two concentric annular interior channels one of which communicates with the leading conduits and the other of which communicates with the trailing conduits. First and second outlet means communicate with both of the channels, and adjustable control means in the annular channels is operative for diverting initial filtrate into the first outlet means and wash filtrate into the second outlet means to thereby separate the initial filtrate and the wash filtrate from one another.
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