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The Bard 905-0226 expansion valve assembly is an OEM thermostatic expansion valve (TXV) used in the refrigerant circuit of Bard wall-mounted HVAC equipment to meter refrigerant into the evaporator based on load, helping maintain proper superheat and stable cooling performance. A worn or restricted TXV can contribute to poor capacity, coil icing, or erratic pressures, so replacing it with the correct Bard valve assembly is a dependable way to restore factory operation and protect the compressor. Confirm compatibility by matching the full part number 905-0226 to your unit model and serial information before ordering, since TXVs are refrigerant and application specific components.