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The Bard 905-0350 TXV Assembly is an OEM thermostatic expansion valve assembly used in Bard wall-mount air conditioning and heat pump refrigeration circuits to meter refrigerant flow into the evaporator and maintain proper superheat for stable cooling performance. A properly operating TXV helps prevent coil flooding and protects the compressor while keeping capacity and efficiency where they should be. If your unit is showing symptoms like poor cooling, erratic suction pressure, or icing related to refrigerant feed control, replacing the TXV with the correct Bard OEM assembly is the safest way to restore factory operation and fit. Note that 905-0350 is reported as obsolete and commonly replaced by Bard 905-0634BX, so confirm the correct current replacement by model and serial number before ordering.