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The Bard 905-0761 expansion valve assembly is an OEM refrigerant metering component used in Bard wall mounted air conditioners and heat pumps to regulate refrigerant flow into the evaporator coil based on operating conditions. A properly functioning expansion valve helps maintain correct superheat, supports stable suction pressure, and protects compressor operation, especially when symptoms point to restricted flow, poor cooling, or coil freeze ups. As a genuine Bard replacement part, 905-0761 is intended to match factory fit and performance for compatible units, but confirming the exact model and serial number application before ordering is recommended since expansion valve selections can vary by capacity and refrigerant type.