Expansion Valves / Orafice Tubes

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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.

PTAC1602