| 摘要 |
<p>A filtration apparatus includes an array of filters arranged in parallel about a rotatable assembly 24 for successively backwashing each of the filter elements 19 within the array. The rotatable assembly includes a connector bachwash shoe 26 and a cage having an annular circlip 33 supporting a valve element 31 therein. During normal filtration, water flows up the inlet tube 11, through a respective opening 17 into filtration chamber 13, and then through a respective filter element. The filtrate flows upwardly into plenum 16 and out through outlet 14. In a backwashing mode, the assembly 24 is rotated by a moving means that includes shaft 22 driven by a stepper motor 34 such that the valve element is radially unseated out of the backwash outlet 30. Each filter element is then backwashed in turn as an L-shaped passage 27 of the bachwash shoe is aligned with a respective opening 17 allowing backwash fluid to flow out opening 28a to the backwash outlet. At the end of the backwash cycle, the valve element is reseated into the backwash outlet.</p> |
