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Machine translation
1. (WO1979000694) A METHOD OF CONTROLLING THE RELATIVE HUMIDITY IN A SOIL ENVIRONMENT AND APPARATUS FOR ACCOMPLISHING SAME
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1979/000694    International Application No.:    PCT/US1979/000127
Publication Date: 20.09.1979 International Filing Date: 02.03.1979
IPC:
A01G 25/16 (2006.01), F16K 7/04 (2006.01), G05D 22/00 (2006.01)
Applicants:
Inventors:
Priority Data:
882789 02.03.1978 US
Title (EN) A METHOD OF CONTROLLING THE RELATIVE HUMIDITY IN A SOIL ENVIRONMENT AND APPARATUS FOR ACCOMPLISHING SAME
(FR) METHODE DE CONTROLE DE L"HUMIDITE RELATIVE D"UN SOL ET APPAREIL S"Y RAPPORTANT
Abstract: front page image
(EN)Method and apparatus are disclosed for controlling the relative humidity of a soil environment at a pre-set value using an enclosed volume (106) of a water-soluble or water-swellable material (114), said enclosed volume separated from the external environment by a relatively stiff and strong semipermeable membrane (104) and separated from a pressurized irrigation water supply by a water-impermeable constrictable flexible section (108) or diaphragm in the supply line (36, 38). When the soil is more moist than the pre-set value, intake of water through the membrane causes expansion of the water-swellable material which in turn constricts the flexible section of the water supply line to interrupt the flow of water to the soil. When the soil moisture falls below the pre-set value, egress of water from the water-swellable material releases the constricting force on the flexible section thereby allowing increased flow of water through the flexible section of supply line to the soil.
(FR)Methode et appareil de controle de l"humidite relative d"un sol a une valeur predeterminee en utilisant un volume ferme (106) d"un materiau soluble dans l"eau ou absorbant l"eau (114), ledit volume etant separe de l"exterieur par une membrane semi-permeable solide et relativement rigide (104) et separe d"une alimentation d"eau d"irrigation sous pression par une section (108) ou diaphragme resserrable impermeable a l"eau place dans la conduite d"alimentation (36, 38). Lorsque l"humidite du sol est superieure a la valeur predeterminee, l"entree d"eau a travers la membrane provoque la dilatation du materiau absorbant l"eau qui, a son tour, resserre la section flexible de la conduite d"alimentation d"eau, coupant ainsi le debit d"eau dans le sol. Lorsque l"humidite du sol est inferieure a la valeur predeterminee, la sortie de l"eau du materiau absorbant provoque le relachement de l"etranglement sur la section flexible, permettant ainsi d"augmenter le debit d"eau a travers la section flexible de la conduite d"alimentation dans le sol.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)