EKC 312 is a controller for operation of evaporators in water chillers. The controller and valve can be used where there are requirements for accurate control of superheat and temperature in connection with refrigeration, e.g.: • Processing plants (water chillers). • Cold stores (air coolers). • A/C plants. EKC 312 controls the superheat in the evaporator by a pressure transmitter, Type AKS 33, and a temperature sensor (Pt 1000 ohm). The expansion valve is with step motor of the type ETS.