Fluid sprinkling – spraying – and diffusing – Mobile distributor – Irrigation device
Patent
1979-08-30
1981-12-01
Chambers, A. Michael
Fluid sprinkling, spraying, and diffusing
Mobile distributor
Irrigation device
A01G 2700, B05B 300
Patent
active
043032036
ABSTRACT:
A center pivot irrigation system includes an irrigation line supported by towers and rotatable about a central pivot. One tower thereof, for example the outermost tower, includes a drive motor energized in response to a signal from a pressure responsive control apparatus. The control apparatus is operable to sense the magnitude of the water pressure at a selected location in the line and therefore to sense decreases in such water pressure when the line travels uphill and increases in the pressure when the line travels downhill. The control apparatus produces a signal responsive to the sensed pressure which causes the drive motor to move the line at a rate inversely related to the average relative elevation of the line. That is, at faster rates of travel when the elevation of the line is below a reference elevation and at lower rates of travel when the elevation of the line is above the reference elevation to thereby prevent underwatering of uphill slopes and overwatering of downhill slopes. The selected location is preferably an equal area location such that the area traversed by the portion of the line from the pivot to the selected location is equal to the area traversed by the portion of the line from the selected location to its end. Thus, the sensed pressure is representative of the pressure at the equal area location.
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