To provide water supply equipment that enables easy detection of failure in a backflow prevention valve, includes a plurality of sets of water supply devices each comprising a backflow prevention valve, a pump, etc., and is configured by coupling the water supply devices in parallel to each other via water distribution pipes.
The water supply equipment 3 includes: water supply devices 15, 25 which comprise backflow prevention valves 11, 21 and motor drive devices 16, 26 for driving motors including pumps 12, 22; and a pump control device 4 for controlling an operation state of the water supply devices via the motor drive devices. Monitor circuits are added to the motor drive devices, so that no special instrument is required for detecting that any of the motors is reversed. As the result, increase in cost of the water supply equipment 3 can be minimized. When the reversal is detected by the detection circuit, all the water supply devices are temporarily completely stopped by an instruction from the pump control device. After than, all the water supply devices are restarted at the same time, to allow temporal restoration operation of the water supply equipment and improve robustness.
| JP4614758B2 | 2011-01-19 | |||
| JP4175912B2 | 2008-11-05 |
Kiyoshi Matsuzaki
Hiroshi Yamamoto
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