What is the function of equalising line in Thermostatic expansion valve?

The equalizing line in a thermostatic expansion valve (TXV) serves to balance the pressure between the sensing bulb and the valve body. This pressure equalization allows the TXV to respond accurately to changes in evaporator temperature, ensuring optimal refrigerant flow. By maintaining this balance, the equalizing line helps regulate the superheat level, enhancing the system's efficiency and preventing issues like flooding or starvation of the evaporator.