AC/HEAT- EXPANTION VALVES / ORAFICE TUBES
Expansion Valves / Orafice Tubes : What do they do?
The expansion valve removes pressure from the liquid refrigerant to allow expansion or change of state from a liquid to a vapor in the evaporator:
• Meters refrigerant flow
• Drops pressure and temperature of the refrigerant
TECH TIP: The most common block failure is loss of gas charge inside the power element head. Plugged-up expansion valves cannot be flushed out and must be replaced. When replacing a capillary type expansion valve, make sure the capillary coil or bulb is property attached to the outlet side of the evaporator line and well insulated with prestite insulation tape.