| 摘要 |
A backwashable filter comprises a filter body, a backwash nozzle having an inlet adjacent to the upstream surface of the filter body, and a control device sensing a pressure drop across the filter body and effective to initiate a backwash operation by connecting the backwash nozzle to the atmosphere and effecting relative rotary movement between the filter body and the backwash nozzle. The control device includes further means effective, upon sensing a higher pressure drop, to automatically terminate the backwash operation.
|
