| 摘要 |
The invention relates to a heating system with circulating liquid and a pump, the inlet flow and circulation of the heating liquid being controlled by the pressure differential that is produced by the thermostatic valves 6. The pressure differential directly controls the circulating pump 5 and feed pump 4, which have different functional characteristics. The said pumps can be assembled so that they operate on the same shaft, or so that they have a double-sided impeller. <IMAGE>
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