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The Bard 905-0280 expansion valve assembly is an OEM refrigerant metering component used in Bard wall mounted package air conditioners to regulate liquid refrigerant flow into the evaporator, helping maintain proper superheat and stable cooling performance under changing loads. Replacing a worn or sticking valve can correct symptoms like poor cooling, evaporator icing, or unstable suction pressure, and it helps protect the compressor by keeping the system operating within Bard design conditions. This Bard factory replacement assembly is built to match the original fit and connections used on specific Bard wall mount models, so confirm compatibility by checking the unit model and serial number or the Bard parts breakdown before ordering.