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The Bard 905-0633 expansion valve assembly is an OEM refrigerant metering component used in Bard wall mounted HVAC units to control how much refrigerant enters the evaporator coil under changing load conditions. A correctly operating expansion valve helps maintain stable suction pressure and proper superheat, which supports consistent cooling performance and protects the compressor from floodback or starving. This Bard factory part is supplied as a complete valve assembly for dependable fit and operation, making it a smart choice when troubleshooting symptoms like poor cooling, icing, or erratic pressures. Always confirm unit model and refrigerant type before ordering, and have installation and charging performed by a qualified technician.