Fluid handling – Ambient condition change responsive – For controlling soil irrigation
Patent
1985-11-18
1987-09-29
Chambers, A. Michael
Fluid handling
Ambient condition change responsive
For controlling soil irrigation
200 6104, 200 6106, 239 63, A01G 2700
Patent
active
046963197
ABSTRACT:
A moisture-actuated apparatus for controlling the flow of water by expandingly absorbing moisture from and contractingly emitting moisture into a moisture-conducting medium. The actuation is binary, with one state resulting from the expansion of an actuating element when it absorbs moisture from a water-conducting medium having a higher concentration of moisture than the element. The second state results from the contraction of the actuating element when the medium contains a lower concentration of moisture than the element, causing the element to emit moisture into the medium. The actuating element includes a thirotropic hydrophilic expandite material disposed in a matrix of wicking material. In one embodiment the absorptive expansion is used to provide a high-moisture signal in the same embodiment, contraction of the element produces a low moisture signal for opening the valve. In other embodiments, the expansion and contraction of the actuating element is used to directly actuate a valve.
REFERENCES:
patent: 3204872 (1965-09-01), Whear
patent: 3562731 (1971-02-01), Hsu
patent: 3874590 (1975-04-01), Gibson
patent: 3910300 (1975-10-01), Tal
The American Heritage Dictionary, Houghton Mifflin Co., Boston, p. 124, 1976.
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