| 摘要 |
A filter for treating liquids having a filter compartment separated into an upper inlet chamber and a lower underdrain chamber. An inlet pipe, having a control valve associated therewith, communicates with the inlet chamber. A backwash storage compartment is positioned adjacent the filter compartment. A connecting pipe is provided having a first end in communication with the underdrain chamber and a second end in communication with a backwash pump which permits the passage of filtered liquid from the underdrain chamber therethrough into the backwash storage compartment. A blower is provided to deliver air through an air supply conduit into the underdrain chamber. A level sensing switch, positioned within the inlet chamber, closes off the control valve and activates the blower and pump when the liquid level therein reaches a predetermined level. The first end of the connecting pipe includes a float valve associated therewith which permits the passage of liquid therethrough until the level of liquid within the underdrain chamber drops to the level of the float valve. |
