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The Bard 905-0297 Expansion Valve Assembly is an OEM refrigerant metering component used in Bard wall-mounted air conditioners to control how much liquid refrigerant enters the evaporator, helping the system maintain proper superheat and stable cooling performance as load conditions change. Replacing a restricted or leaking expansion valve assembly can correct symptoms like poor capacity, evaporator icing, or unstable suction pressure, while keeping the unit operating to Bard specifications. Because fit and charge control are critical on Bard equipment, confirm your unit model and serial number with the parts list before ordering Bard 905-0297, and follow proper refrigerant handling practices during installation and evacuation.