The Trane VAL18772 Thermal Expansion Valve (TXV) is a refrigeration control component designed to regulate refrigerant flow into an HVAC system’s evaporator. It responds to evaporator outlet temperature and pressure, adjusting the refrigerant flow to maintain proper superheat levels. This valve is used in compatible Trane air conditioning and refrigeration equipment to support efficie... https://www.partshnc.com/val18772-trane-thermostatic-expansion-valve-txv