The Lennox 64W51 Thermal Expansion Valve (TXV) is a refrigerant metering component designed for compatible Lennox air conditioning and heat pump systems. It regulates the flow of liquid refrigerant into the evaporator coil by responding to temperature and pressure changes, ensuring the appropriate refrigerant supply based on cooling demand. This controlled flow supports efficient heat... https://www.partshnc.com/64w51-lennox-thermal-expansion-valvetxv-valve