Expansion Valve: Description and Operation
THERMOSTATIC EXPANSION VALVEA thermostatic expansion valve (TXV) regulates the flow of refrigerant into the auxiliary evaporator core. It is also the dividing point in the auxiliary portion of the refrigerant system between the low and high-pressure sides.
The TXV includes a temperature sensing bulb which measures the temperature of the refrigerant in the suction line and transmits it to the TXV. This temperature variation regulates the refrigerant flow to the auxiliary evaporator core.
- When the bulb senses a high temperature, the TXV opens to increase refrigerant flow through the auxiliary evaporator core.
- When the bulb senses a low temperature, the TXV starts closing to decrease refrigerant flow to the auxiliary evaporator core.