| 摘要 |
<p>The drinking and washing water filter has means for cleaning the filter body by back-flushing while water is being delivered. It has two independent filter chambers, divided in to part-chambers by filter bodies. The part-chambers in front of or behind the bodies are automatically connected by a control system alternately to the inlet or outlet, dependent on the pressure levels in them. The closed part-chambers are connected by valves to a dirt passage. The pressure build-up in the part-chamber connecting passages, and whose shut-off is delayed, shuts the valves in opposition to springs. The control system can comprise a set of spring-loaded pistons working in a cylinder with connections.</p> |
