What are the advantages of Electronic expansion valves?

There are 2 types of expansion valve available in the market

  1. Thermostatic expansion valves 
  2. Electronic expansion valves (EEV):
    – Pulsating
    – Proportional 

Advantage of Electronic towards a Thermostatic expansion valve:

  1. EEV can work with a lower HP/LP ratio 
  2. Better evaporator efficiency due to better superheat control 
  3. Quicker to install 

Attention points:

Some electronic expansion valves are bleeding, meaning that even when fully closed they let a very small amount of refrigerant pass => danger that liquid goes back to the compressor!
To avoid this, a solenoid valve would need to be installed before the electronic expansion valve