Moisture-responsive valve assembly

Details Moisture-responsive valve assembly Moisture-responsive valve assembly

1990-02-14

1991-02-05

Chambers, A. Michael

Fluid handling

Ambient condition change responsive

For controlling soil irrigation

251 23, 251 32, 239 63, A01G 2500

Patent

active

049896288

ABSTRACT:
A moisture-responsive valve assembly includes a housing having a moisture-swellable body to swell in volume in response to soil moisture, and a bi-stable snap-action device for controlling the valve in response to the volume of the moisture-swellable body. The valve assembly further includes a damped delay mechanism effective to close the valve after it has been open for a predetermined period of time.

REFERENCES:
patent: 1004650 (1911-10-01), Hilton
patent: 2421810 (1947-06-01), Simpson
patent: 3422833 (1969-01-01), Kitrilakis
patent: 3874590 (1975-04-01), Gibson
patent: 3898843 (1975-08-01), Waterston
patent: 4055200 (1977-10-01), Lohoff
patent: 4214701 (1980-07-01), Beckman
patent: 4648555 (1987-03-01), Gumbman, Jr.
patent: 4739789 (1988-04-01), Hamilton

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