As the old saying goes, an ounce of prevention is worth a pound of cure. This is especially true when replacing a thermostatic expansion valve (TXV). Always take the necessary precautions when replacing these valves, as this will ensure the valve will function properly and maintain the required refrigerant superheat at the outlet of the evaporator.
TXVs are typically connected to the system’s piping by either a brazed/soldered or flared connection. Most valves today use a brazed connection; however, there are many older systems still in operation that use a flared connection.