Control method for expansion valves in car air conditioning systems uses bellows filled with inert gas which pushes rods against spring attached to the valve stem so as to open valve when threshold pressure or temperature is exceeded

摘要

The control method for expansion valves in car air conditioning systems with carbon dioxide as coolant uses a bellows (44) filled with inert gas which pushes rods (48) against a spring (39) attached to the valve stem so as to open the valve when a threshold pressure or temperature is exceeded. Alternatively a bypass channel is opened. An independent claim is included for expansion valves using the method,.