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Bard part 5651-251BX is an OEM electronic expansion valve (EEV), described as an E2V35 style valve with 16 mm connections, used to precisely meter refrigerant flow into the evaporator coil so the system can maintain stable superheat across changing load and outdoor conditions. In Bard wall mounted air conditioners and heat pumps that use EEV control, this valve works with the unit control board and suction temperature and pressure inputs to regulate capacity and protect the compressor, making it a critical component when addressing improper superheat, hunting, coil freeze ups, or poor cooling performance. Because it is a refrigerant circuit component, installation should be performed by a qualified technician and the correct Bard model and parts list should be confirmed before ordering to ensure proper fit and connector style.
Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.
A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.
Example: 8406-142BX is physically identical to 8406-142.