Tests were conducted using combination fill-buildup-vent valves in filling liquid oxygen converters. The converters were connected for filling to simulate, as nearly as possible, aircraft connections in servic¬ing aircraft in the field. This series of tests indicates that the optimum filling condition of liquid oxygen converters is obtained when a combina¬tion fill-buildup-vent is used to control flows of oxygen in the converter fill and buildup circuits.
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