| 摘要 |
<p>The present invention provides a water piping system wherein when a predetermined time elapses after the flow of the water in a hose (5) has stopped, the water is drawn out of the hose, thereby preventing proliferation of various bacteria in the water standing stagnant in the hose and when the temperature of the water drops, the water is completely drawn out of the hose, thereby preventing a water pipe from rupturing or cracking in the wintertime. The water pipe (1) including a reducing valve (3) which is at a position higher than a waterstop valve (2) is connected with a hose (5) through a first electromagnetic valve (4). The required number of second electromagnetic valves (7) are located intermediate on the hose. When a predetermined time elapses after the flow of the water through the hose has stopped, the first valve is temporalily closed while the second valves are opened. When a water-temperature sensor incorporated into one of the second valves senses that the temperature of the water has dropped to a predetermined lever, the first valve is closed while the second valves are put open.</p> |
