Many of these couplings are of the so-called "jaw" type. Some of the information below has been extracted from commercial product catalogs and specifications. [10][11][12][13]King of the Air[edit]"Air King"[14] Universal Air Hose Couplings, also known as "Chicago Style" fittings, are malleable iron

As the design and manufacturing process of aircraft accessories become more and more mature, the system failures of a certain type of aircraft air-conditioning system due to component failures have decreased year by year.

The air circulation refrigeration system achieves refrigeration by adiabatic expansion of compressed air in the expander to obtain low-temperature airflow. Its ideal working process includes four processes: isentropic compression, isobaric cooling, isentropic expansion and isobaric heat absorption.