Fluid handling – Self-proportioning or correlating systems – Self-proportioning flow systems
Patent
1983-06-23
1985-10-29
Schwadron, Martin P.
Fluid handling
Self-proportioning or correlating systems
Self-proportioning flow systems
137110, 137510, 137595, 12820314, G05D 1103
Patent
active
045495637
ABSTRACT:
A mixer for delivering a mixture of two gases G.sub.1 and G.sub.2 in proportions respectively and by volume of X/100 and (100-X)/100; X/100 not being allowed to be smaller than a particular value. Each gas circuit comprises a pipe provided with a cock for adjustment of the rate of flow and with a calibrated orifice selected in such manner that for an identical pressure P, the rates of flow of the gases through these orifices are in the ratio X/(100-X), with devices for limiting the pressure of the gas G.sub.2 to that of the gas G.sub.1, as well as for limiting the pressure in both circuits. The invention is applicable to an oxygen-nitrous oxide mixer for anaesthetic purposes, in which the proportion of oxygen in the mixture supplied cannot drop below 25% and the flow rate of nitrous oxide cannot exceed a predetermined maximum.
REFERENCES:
patent: 2016234 (1935-10-01), Hughes
patent: 2245210 (1941-06-01), McElwaine
patent: 2405010 (1946-07-01), Bucknam
patent: 2935084 (1960-05-01), Crawford et al.
patent: 3013790 (1961-12-01), Anderson et al.
patent: 3351057 (1967-11-01), Goodyear et al.
patent: 3511270 (1968-09-01), Fehrenbach et al.
patent: 3785333 (1974-01-01), Warncke et al.
patent: 4325349 (1982-04-01), Fehrenbach
Hepperle Stephen M.
L'Air Liquide Societe Anonyme Pour l'Etude et, l'Exploitation de
Schwadron Martin P.
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