Thermostatic expansion valve or TEV is one of the most commonly used throttling devices in the refrigerator and air conditioning systems. The thermostatic expansion valve is the automatic valve that maintains the proper flow of the refrigerant in the evaporator as per the load inside the evaporator. If the load inside the evaporator is higher it allows the increased inflow of the refrigerant and when the load reduces it allows the reduction in the flow of the refrigerant. This leads to the highly efficient working of the compressor and the whole refrigeration and the air conditioning plant.