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The Bard 800-0175 Expansion Valve Assembly is an OEM refrigerant metering component used in Bard wall-mounted HVAC equipment to regulate refrigerant flow into the evaporator coil, helping the system maintain proper superheat and stable capacity under changing load conditions. A worn or sticking expansion valve can contribute to poor cooling, coil icing, or unstable suction pressure, so replacing it with the correct Bard factory part is a reliable way to restore normal operation and protect the compressor. Because this is a refrigerant circuit component, confirm the exact unit model and serial compatibility before ordering, and have installation performed by a qualified technician who can recover refrigerant, replace the valve assembly correctly, and evacuate and recharge the system to specification.