| 摘要 |
The control arrangement for a swimming pool filter includes two pairs of control valves, the discharge port of the first valve in each pair being coupled to the intake port of the second valve. The intake ports of the first valves are connected by a high-pressure conduit to the output end of the filter pump whose input end draws water from the pool. Two low-pressure conduits connect the discharge ports of the second valves to the pool and to a waste line respectively. The filter is connected by by-pass lines to the coupled ports between the valves in each pair. A single operating mechanism is connected to all valves and operates the same in timed sequence in which the valves direct water flow from the pump either through the filter in a first direction to the pool, or through the filter in the opposite direction to a waste line, or ultimately directly from the pool to the waste line.
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