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Bard 800-0051 is an OEM expansion valve assembly used in the refrigeration circuit to meter refrigerant into the evaporator coil based on load, helping the unit maintain stable superheat and dependable cooling performance. When a wall mount system shows symptoms like poor cooling, hunting pressures, or icing from improper refrigerant feed, replacing the TXV with the correct Bard part is often the proper fix to restore factory operation and protect the compressor. This Bard expansion valve assembly is intended for specific Bard equipment configurations, so confirm your model and serial number and match the original part number before ordering to ensure correct capacity, connection style, and sensing bulb application.