Gravity flow chemigation system and low level shutoff valve

Details Gravity flow chemigation system and low level shutoff valve Gravity flow chemigation system and low level shutoff valve

1993-04-07

1994-11-22

Walton, George L.

Fluid handling

Diverse fluid containing pressure systems

Fluid separating traps or vents

137399, 137423, 137435, 137456, 405 39, F16K 3122, F16K 3300

Patent

active

053659708

ABSTRACT:
A gravity flow chemigation system (10) is disclosed which generally consists of chemical supply tank (37), in which chemical (29) is contained, a supply line (37) connected to the bottom of chemical supply tank (36), and a low-level shutoff valve (11) suspended across an irrigation ditch (39) and partially below the surface of irrigation water (38). Chemical enters the valve (11) from supply line (37) through air vent tube (21) and inlet (18). The chemical (29) within supply line (37) will continue to flow through valve (11), out outlet (15) and through outlet screen (28) to mix with irrigation water (38) as long as the level of irrigation water (38) remains at a level above converging valve seat (16) of lower float valve (13). Once the level of irrigation water (38) falls below valve seat (16), lower float (17) will engage the lower converging valve seat (16) and close off the valve which will not reactivate until manually reset, even if the irrigation water level rises.

REFERENCES:
patent: 2103057 (1937-12-01), Blumer
patent: 2362747 (1944-11-01), Duke
patent: 2582819 (1952-01-01), Daily
patent: 3203245 (1965-08-01), Smallpiece
patent: 4051030 (1977-09-01), Huiet, Jr.
patent: 4057076 (1977-11-01), Varis et al.
patent: 4193417 (1980-03-01), Bowman
patent: 4640304 (1987-02-01), Looney
patent: 4715345 (1987-12-01), Reames, Jr.
Letter from the State of Idaho Department of Agriculture, see pp. 2 and 3.

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