The Heatcraft Refrigeration 29341801 Thermostatic Expansion Valve is a replacement component designed for compatible commercial refrigeration systems using R-22 refrigerant. It regulates refrigerant flow into the evaporator coil by adjusting the opening in response to temperature and pressure changes, helping maintain proper evaporator superheat. This process supports efficient heat a... https://www.partshnc.com/heatcraft-refrigeration-29341801-thermostatic-expansion-valve-r22-3-8-1-2-1-4-fbve-1-c