An automatic expansion valve uses a thermal bulb to help control the amount of refrigerant being fed into the evaporator.

Question

Quizplus · Accepted Answer

An automatic expansion valve controls the flow of refrigerant based on the pressure in the evaporator, not temperature, and does not use a thermal bulb. A thermal expansion valve (TXV), not an automatic expansion valve, uses a thermal bulb to sense the temperature.

An Automatic Expansion Valve Uses a Thermal Bulb to Help