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The Bard 905-0634 TXV Assembly is an OEM thermostatic expansion valve assembly used in Bard wall mount HVAC equipment to meter refrigerant into the evaporator at the correct rate as operating conditions change. A properly functioning TXV helps maintain stable suction pressure and coil temperature, supporting normal cooling capacity while helping prevent issues tied to improper superheat such as coil flooding or reduced performance. This Bard replacement part is intended as a direct-fit component for compatible Bard models, so confirm the exact unit model and serial number and match refrigerant type and application before ordering to ensure proper fit and operation after installation.