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The Bard 800-0255 Expansion Valve Assy (Service) is an OEM thermostatic expansion valve (TXV) used to meter refrigerant into the evaporator coil and maintain stable superheat for dependable cooling performance. When a TXV sticks, hunts, or restricts flow, you can see symptoms like poor capacity, coil icing, or erratic suction pressures, so replacing it with the correct Bard service valve helps restore proper refrigerant control and system reliability. Because TXVs are application-specific, match this part number to your Bard unit model and serial information, and plan on standard refrigeration best practices such as recovering refrigerant and replacing the filter drier as required during sealed-system service.