An automatic expansion valve regulates refrigerant flow to maintain constant evaporator pressure.
It adjusts opening/closing based on pressure, ensuring stable evaporator pressure despite load variations.
This function earns it the designation of a constant pressure expansion valve.
Conversely, a thermostatic expansion valve adjusts based on evaporator outlet superheat.
A float valve manages liquid levels, not direct pressure control.
A capillary tube acts as a fixed restriction, incapable of automatic flow adjustment.
Consequently, "constant pressure expansion valve" is the accurate alternative name.