The Trane VAL18892 Expansion Valve is a precision refrigerant control component designed for compatible Trane HVAC systems. It regulates the flow of liquid refrigerant entering the evaporator, adjusting the refrigerant supply according to system demand and operating conditions. Used in compatible air conditioning and heat pump equipment, the valve supports proper evaporator performanc... https://www.partshnc.com/val18892-trane-expansion-valve