| 摘要 |
<p>A self-cleaning pre-filter system (10) generally comprises a system inlet (11); a sediment filter (13) having a filter inlet (15) in selective fluid communication with the system inlet, a selectively openable drain port (18) and a filter outlet (16), separated from the filter inlet and the drain port by a filter screen (20); a pressure accumulator (28) having a first chamber (31) in open fluid communication with the filter outlet and having a sealed second chamber (32) containing a compressible medium, the first chamber and the second chamber being separated one from the other by a flexible diaphragm (30); and a system outlet (12) in selective fluid communication with the filter outlet and the first chamber. A controller (32) operates valves to periodically back flush the sediment filter utilizing energy stored in the pressure accumulator. Any detritus removed from the filter screen during the back flush process is immediately discharged from the system through the drain port (18).</p> |
