Copper was the mainstay in HVAC and refrigeration coils until 2011, when copper prices went through the roof. As manufacturers began testing alternatives, the industry settled on aluminum as a workable, less costly option.
At one time or another, every technician has run into a refrigeration system that is not functioning properly. The question then becomes how to diagnose and determine if the problem is the TXV.
As the old saying goes, an ounce of prevention is worth a pound of cure. This is especially true when a replacing a thermostatic expansion valve (TXV).