| 摘要 |
A gravity flow, single or multi-cell filter incorporating an integral backwash control chamber for enabling backwashing to occur without the need for backwash pumps. The backwash control chamber contains a volume of backwash liquid, and communicates with a source of pressurized backwash liquid through a float-controlled flow control valve in order to maintain a desired liquid level within the backwash control chamber during backwashing operations. The flow of backwash liquid from the backwash control chamber is controllable either by means of three-way valves interconnecting the backwash control chamber with the filter outlet chamber, or by wash water control gates within the backwash chamber that are adapted to selectively cover outlet openings to permit backwash flow to enter the filter outlet chamber.
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