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Bard part 905-0493 is an OEM expansion valve assembly used in Bard wall-mount HVAC equipment to meter refrigerant into the evaporator and maintain stable superheat across changing loads. When an expansion valve sticks, leaks, or loses control, you can see poor cooling, coil icing, or erratic pressures, so replacing it with the correct Bard assembly helps restore proper refrigerant feed and protect the compressor from floodback or starvation. This component is intended for refrigeration circuit service, so verify compatibility by model and serial number and have a licensed technician confirm refrigerant type and install procedures before opening the sealed system.