Pneumatic moisture sensitive valve

Details Pneumatic moisture sensitive valve Pneumatic moisture sensitive valve

1990-01-23

1992-05-19

Chambers, A. Michael

Fluid handling

Processes

137 783, 47 485, E03B 100, F16K 1736

Patent

active

051138883

ABSTRACT:
A method and apparatus for irrigating plant life in a manner which conserves water and optimizes soil moisture conditions. A valve is interposed between a source of water and a water outlet which is responsive to changes in soil moisture and correlative of the need for moisture in the soil. A diaphragm reciprocates between first and second positions, and the diaphragm is operatively connecting a water inlet and an outlet through a seal. The diaphragm movement is restrained by pneumatic pressure opposing the water inlet pressure. In addition, a check valve is provided whereupon a moisture sensor disposed at a terminal portion of the device directly reading moisture level in the soil allows unidirectional air flow for self-purging of the sensor.

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patent: 4987915 (1991-01-01), Goldsmith

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