| 摘要 |
A pumping system utilizing at least one high flow capacity impeller and one low flow capacity impeller to meet the flow delivery requirements of a widely variable flow range. A control means for selecting only the low flow capacity impeller for low flow requirements and, at greater flow demands, operate to concurrently activate the high flow capacity impeller and divert the flow of the low flow impeller through the high flow impeller in a series relationship.
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