| 摘要 |
A backwashable filtering device is described of the type including a housing, a filter body, a backwash nozzle having a nozzle inlet disposed adjacent to the upstream surface of the filter body, and pressure sensor means for sensing the pressure drop across the filter body and effective, upon sensing a predetermined pressure drop, to initiate a backwashing operation by connecting the backwash nozzle to the atmosphere and initiating relative rotary movement between the filter body and the backwash nozzle. The filtering device further includes a position sensor for sensing the home angular position of the filter body with respect to the backwash nozzle, and a control effective, only when said home angular position is sensed, for terminating the backwash operation. |
