Fluid handling – Self-proportioning or correlating systems – Mixture condition maintaining or sensing
Patent
1976-05-13
1977-05-17
Nilson, Robert G.
Fluid handling
Self-proportioning or correlating systems
Mixture condition maintaining or sensing
G05D 1100
Patent
active
040235874
ABSTRACT:
A method for the control of proportion of two gases which are delivered to a mixed gas line for use for example in a respiratory breathing apparatus in which the gases are delivered to a mixed gas line from a pressure control vessel, comprises continuously monitoring the pressure in the control vessel and when the pressure therein is at an initial predetermined pressure admitting a first gas into the pressure control vessel until the pressure therein increases to a predetermined higher pressure and then stopping the admission of the first gas and initiating the admitting of a second gas into the pressure control vessel, continuing to admit the second gas until a predetermined additional higher pressure is achieved in the pressure control vessel, discontinuing the admission of the second gas when the predetermined additional higher pressure is reached and initiating the withdrawal of the mixed gas through the mixed gas line, continuing to withdraw the mixed gas through the mixed gas line until an initial pressure is again reached in the pressure control vessel at which time the complete process is repeated again. The apparatus includes a first control valve in a first gas supply line to the pressure vessel and a second control valve in a second gas supply line to the pressure control vessel. A third control valve is arranged in a mixed gas delivery line which connects the pressure vessel. All of the three valves are connected by a control device which is responsive to the pressure in the pressure vessel and the individual control valves are set for opening and closing at different control pressures so that the inflow of the first and second gases and the delivery of the mixed gases will be continuously controlled thereby.
REFERENCES:
patent: 3515155 (1970-06-01), Haffner
patent: 3593735 (1971-07-01), Reiher
Dragerwerk Aktiengesellschaft
Nilson Robert G.
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