Larry A Butler

Author:

Larry Butler

ISBN #:

0230555268

US Patent:

53659708, Nov 22, 1994

Filed:

Apr 7, 1993

Appl. No.:

8/045032

Inventors:

Larry D. Butler - Wilder ID

International Classification:

F16K 3122
F16K 3300

US Classification:

137192

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.