‎Thermostatic expansion valves regulate the flow of liquid refrigerant in
    evaporators. The superheating of the refrigerant fluid controls liquid injection.
    Thermostatic expansion valves act as throttle between the high and
    lowpressure sides of refrigeration systems and ensure that the refrigerant flow
    rate into the evaporator matches the rate of evaporation of liquid refrigerant in
    the evaporator. If the actual superheating is greater than the set point,
    the valve feeds the evaporator more liquid refrigerant. If the actual
    superheating is lower than the set point, the valve decreases the flow of liquid
    refrigerant to the evaporator. This ensures that the evaporator is utilized fully
    and that no liquid refrigerant can reach the compressor