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Bard part 5651S036BX is an OEM swaged check valve used in Bard HVAC refrigeration circuits to keep refrigerant moving in the correct direction and reduce the risk of reverse flow during off cycles and changing operating conditions. A check valve like this is a small part, but it plays an important role in protecting system performance and supporting stable operation in Bard wall mounted and packaged equipment where the piping layout depends on controlled one way flow. Because this valve uses swaged connections, it is intended to be installed into the proper size copper line by a qualified technician using correct brazing practices and nitrogen purging, and you should always confirm match by model and serial number or the Bard parts list before ordering.
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.