| 摘要 |
PROBLEM TO BE SOLVED: To provide a circular bottle valve for an automatic water level control of paddy field, with which the automatic water level control in wetland rice culture is made simpler and more inexpensive than the conventional sensor facilities. SOLUTION: This circular bottle vale body comprises a circular bottle float 11 , has a large diameter d1 of a bottom 14 of a funnel 12 on the float, a large bottom angleαof a slope 13 , a respectably high circular bottle height h1 and circular bottle slope height h2 . A shaft 2 is connected to a hole 15 of a lower end 52 of a water discharge pipe.
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