The Heatcraft Refrigeration 29311827 Thermal Expansion Valve (TXV) is an OEM component designed to regulate refrigerant flow into an evaporator. It works by responding to changes in refrigerant temperature and pressure, precisely metering refrigerant to maintain proper evaporator superheat. This TXV is commonly used in commercial refrigeration systems, including walk-in coolers, freez... https://www.partshnc.com/heatcraft-refrigeration-29311827-thermal-expansion-valve-txv