Plant husbandry – Algae culture
Patent
1973-12-26
1977-09-06
Bagwill, Robert E.
Plant husbandry
Algae culture
61 13, 137596, 2394285, A01g 3102
Patent
active
040459098
ABSTRACT:
Hydroponic nutrient solution is fed to a growing bed by means of a pump withdrawing liquid nutrient solution from a supply reservoir located below the bed. The nutrient solution is rapidly drained from the bed when the pump is de-energized through a dump valve having no moving parts which bypasses the solution draining from the bed directly into the supply reservoir. The dump valve consists of a hollow body having at least one drain aperture. A stream of nutrient solution under pressure passes through a nozzle in the inlet of the valve body and is discharged into the outlet of the valve body. When the pump is de-energized, a major portion of the solution draining from the growing bed passes through the aperture and drains directly into the reservoir.
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"Soilless Growth of Plants," Ellis & Swaney, Reinhold Publishing Corp. (1938), pp. 102-103.
261 28-30
210 169
417 150;151
61 12;13
Bagwill Robert E.
Drummond William H.
Eickholt E. H.
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