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SYSTEM COMPONENTS - 14020_151
Heat Exchanger

Aviation Structural Mechanic E2 - How airplanes are built and how to maintain them
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Filler Valve The filler valve is a combination filler, vent, and buildup valve. The filler portion of the valve is essentially a spring-loaded check valve (fig. 4-8). When the servicing hose of the LOX cart is coupled to the filler connection, the poppet is displaced. This seals the supply port and allows container pressure to be relieved through the vent port. At the same time, oxygen flows through the filler connection and fill port to the container. When the container is full, the liquid flows from the container through the gas port and then through the vent port. In the normal position, the spring in the filler connection holds the poppet in place, forming a gastight seal. There is a check valve in the fill port that acts as a backup seal in the event the filler connection develops a leak. The vent port is also sealed in this position, allowing the gaseous boiloff (from the top of the container) to flow through the gas port to the supply port and into the oxygen system. Pressure Control Valve The pressure control valve used on most converters is a combination opening and closing valve (two valves contained within one housing). These valves are controlled by spring-loaded bellows. The pressure closing valve is spring- loaded open and the pressure opening valve is spring-loaded closed. The pressure closing valve maintains operating pressure within the converter. The pressure opening valve controls the flow of gaseous oxygen into the supply line. If the pilot’s demand for oxygen becomes greater than the capability of the pressure opening valve to deliver, there is a differential check valve that opens and allows liquid oxygen to flow directly into the supply line. It is transformed into gaseous oxygen during its passage through the oxygen system supply lines. Relief Valves A relief valve is provided in the converter to relieve excessive pressure buildup in the event of a malfunction in the pressure control valves. It also relieves normal pressure buildup when the system is not in use. This normal buildup pressure is caused by heat entering the system, and will cause a loss of 10 percent of the systems capacity every 24 hours. As an example, approximately 1 liter of loss will be experienced from a 10-liter converter. Figure 4-8.—Filler valve. 4-14







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