The Trane VAL19939 Thermal Expansion Valve is a refrigerant metering component designed for compatible Trane air conditioners, heat pumps, and other HVAC systems. It automatically controls the flow of refrigerant into the evaporator coil according to system demand, maintaining proper superheat for efficient heat transfer. This precise regulation enhances cooling and heating performanc... https://www.partshnc.com/val19939-trane-3ton-38-x-12-r410a-txv