EXPANSION VALVE FOR REFRIGERATING CYCLE

摘要

PROBLEM TO BE SOLVED: To avoid the occurrence of hunting by eliminating control interfering areas, to improve cooling capacity by always securing appropriate superheating over a wide range from low load time to high load time, and to reduce the driving power of a variable capacity compressor. SOLUTION: The valve travel of an expansion valve 5 is always maintained appropriately by adjusting the injection valve opening characteristic TXV of the valve 5 to become almost equal to the control characteristic C/V of a control valve downwardly inclining in proportion to discharge pressure in the practical operating range of a variable capacity compressor 1 and controlling the valve travel in the opening direction at low load time and in the throttling direction at high load time.