Matric potential responder improvements
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United States of America Patent
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-
Aug 31, 2004
Grant Date -
N/A
app pub date -
Jun 11, 2001
filing date -
Dec 21, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A matric potential responder which includes a liquid absorbing swellable nonliquid material (115) held within a housing (114) of a ceramic material environ such as soil, to the material (115), being subject to a compressive force such as a spring (116). This uses balance of compressive force as compared to tension of the soil matric potential being used to control a position of a valve (119) which is arranged to effect an output such as control of a mains water valve (110).
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