carel.com High E ciency Solutions. E 2 V & PWM: comparison between proportional and pulse width modulating expansion valves Expansion valves are used in commercial refrigeration to supply the evaporators on showcases and in cold rooms. The task of the expansion device is to guarantee correct superheat at the evaporator out- let. It’s easy to understand how better control precision can bring advantages in terms of ener- gy saving, control qua

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