THERMOSTATIC EXPANSION VALVE EQUALIZERS

1. ELEMENT CHARGES

2. EQUALIZERS

3. HUNTING

The external equalizer consists of a line connecting the evaporator outlet to the area in the valve under the diaphragm.

The internal equalizer consists of a passage way in the valve from the valve outlet to the lower side of the power element.

Another way to describe the difference between the two is that the internal equalizer provides a closing force based on the pressure of the refrigerant vapor at the evaporator INLET whereas the external equalizer provides a closing force based on the refrigerant vapor at the evaporator OUTLET.