| 摘要 |
PURPOSE:To save time for controlling the water level of a paddy field by automatically adjusting said level through utilizing buoyancy of a float floated on water of the paddy field. CONSTITUTION:In case of the initial stage when there is no water in a paddy field, a manual valve 3 of a manual valve part is opened by turning a handle 19, while said valve is closed when water reaches a set water level and an outflow of water is changed over to a water level automatic valve 4 of an automatic valve part. Height of a float bar 3 is set at such a height as said automatic valve 4 is closed when the water level of the paddy field reaches the heighest limit. When said level of the paddy field is lowered below the set level in this condition, a float 11 drops and the automatic valve 4 is opened in the direction of opening. In case said level of the paddy field is raised above the set level, said automatic valve 4 is closed in the direction of closing to lower the water level of the paddy field. |
