Abstract: Expansion tube fitting unit for automotive air conditioning systems, emphasizing a one-piece reversible tube valve unit, particularly in substitution for existing expansion tube valve units with positive reversal of the new and improved expansion valve unit to prolong use life not only of existing air conditioning systems, such as automotive air conditioning systems, but air conditioning systems in general, as well as for application in initial or new system installations.

Abstract: A thermodynamic motor of the "sea-saw" type employs water tanks into which opposed ones of low-boiling liquid-containing interconnected tanks on a pivot arm are cyclically immersed. Tank water is maintained at a higher-than-ambient temperature level by a primary heat source. Temperature differential between liquid containing tanks is enhanced by a heat exchanger in the interconnection between tanks. The motor drives fluid compressors and further heat exchanging means communicate with the compressors and tank water to transfer heat of compression into the water to further enhance the temperature differential upon which motor operation depends.