| 摘要 |
It has a principal valve 1 whose opening or closing determines irrigation, said opening and closing being determined by the reduction or increase, respectively, in the weight of an evaporator tank 9 which is resupplied with rainwater collected in a funnel 16 and by means of a pipe (vein) 12 branching off from the outlet 3 for irrigation water. In this way, there is automatic adaptation to the requirements for irrigation since, in dry environments, the water in the evaporator tank 9 evaporates rapidly, reducing the latter's weight and giving rise to frequent automatic openings of the principal valve 1, whilst, in rainy environments, the opposite happens. By regulating the flow of the pipe 12, it is possible to set different irrigation periods, and the system has the great advantage that it is activated and functions by means of the action of natural agents without requiring any type of additional energy supply. <IMAGE>
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