| 摘要 |
There are provided water supplying pumps and check valves in the connecting pipe passage connecting a plurality of water supplying tanks arranged for each of the floors, and the connecting pipe passage connecting the water supplying tank at the lowermost floor with a water pipe. The water supplying tanks are provided with dampers having air chambers. Hydraulic pressure in each of the water supplying tanks is detected, operation of the water supplying pump is controlled in response to the hydraulic pressure, thereby the hydraulic pressures in all the water supplying tanks are made equal and the variation in hydraulic pressure of the water supplying tanks is absorbed by the dampers. With such an arrangement as above, even if the variation in hydraulic pressure is severe, the water supplying pump does not show any gradual repeating of stopping of driving and so control of the hydraulic pressure can be carried out accurately and easily.
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