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The Bard 905-0490 Expansion Valve Assembly is an OEM refrigerant metering component used in Bard wall mounted package air conditioners to regulate refrigerant flow into the evaporator coil and maintain proper superheat for stable cooling performance. A worn or restricted expansion valve can lead to poor capacity, coil icing, erratic suction pressure, or nuisance safeties, so replacing it with the correct Bard factory assembly helps restore designed system operation and protects the compressor. Since expansion valve fit and charge requirements vary by unit and refrigerant, confirm the part number against your Bard model and serial tag or the unit parts list before ordering, and have installation handled by a licensed HVAC technician.