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The Bard 905-0745 electronic expansion valve (EEV) valve assembly, identified as E2V30, is an OEM refrigerant metering component used on select Bard wall mounted and Q TEC style units with EEV controls. This valve assembly precisely regulates liquid refrigerant flow into the evaporator to maintain stable superheat and efficient capacity control under changing load conditions, which helps prevent coil icing and protects the compressor from floodback. Because EEV assemblies are application specific, confirm compatibility by matching the part number to your Bard unit model and serial, and verify any required coil, harness, or driver connections before ordering to ensure a correct fit and proper system operation.