| 摘要 |
PROBLEM TO BE SOLVED: To prevent beforehand polluted water from being supplied to delivery ends, water supply pumps, pressure tanks to eliminate much loss. SOLUTION: This water supply control unit 1 controls water supply in the upstream pipe 7 of delivery ends positioned in the upstream side of delivery ends 6 and it is provided with a detector for water supply condition installed in the upstream side pipe 7 of the delivery ends, a drain pipe 12 connected to the upstream pipe 7, an on/off valve 13 usually closed and provided in the drain pipe 12, and a water supply control device 10 which judges whether the water supplying condition is under a suspension condition or not on the basis of a detected signal of the water supply condition detector 11 and opens the on/off valve 13 when it judges that water supply is suspended and drains water for a specified time interval from the drain pipe 12 after restoration of water supply, and thereafter, closes the valve 13.
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