| 摘要 |
A backwash system for a swimming pool including a pool discharge line and a return line and a filter, characterized by a forward pump in fluid communication between the pool discharge line and the filter and a reverse pump in the return line, and a strainer housing of unique construction in fluid communication between the forward pump and the pool discharge line. The strainer housing includes a strainer basket separating the strainer port from the pool discharge line and the strainer port communicating with the forward pump. A pressure-actuated valve operates within the strainer housing to open fluid communication between the pool discharge line and the strainer when the flow of liquid is in the forward direction and to close the strainer port to the pool discharge line when the flow of fluid is in the reverse direction. A waste line having a pivotal check valve is in communication with the strainer housing on the same side of the strainer basket as the pool discharge line, and the discharge check valve is adapted to be opened to discharge the contents of the strainer housing when the flow of liquid is in the reverse direction. Control means are also provided for selectively actuating the forward and reverse pumps, whereby actuation of the reverse pump automatically backwashes the filter and backwashes the strainer within the strainer housing.
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