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The Bard 905-0635 TXV assembly is an OEM thermal expansion valve kit used to meter refrigerant flow into the evaporator coil, helping maintain proper superheat and stable cooling performance in Bard wall-mounted air conditioners and related packaged systems. A properly functioning TXV supports consistent capacity, protects the compressor from liquid floodback, and improves overall system control under changing load and ambient conditions. Use this genuine Bard part when troubleshooting erratic suction pressure, poor cooling, or suspected valve restriction, and confirm compatibility by matching the complete unit model and serial number before ordering.