Castel thermostatic expansion valves series 22 regulate the flow of refrigerant liquid into evaporators; the liquid injection is controlled by the refrigerant superheat. The new Castel “22” series are designed to work with interchangeable orifice assembly, to provide flexibility in selection of capacities, and can be used in a wide range of applications as listed below:Refrigeration systems (display cases insupermarkets, freezers, ice cream and ice