Electronic Expansion Valves are designed for units with medium-large capacity. It is used for precisely controlling refrigerant flow through the valve is disclosed. It has bi-directional expansion capacity which allows simplifications of the circuit layout in reversible heat pumps. The glass window, positioned in the valve, can be used to check the operation of the expansion device and the presence of turbulence in the refrigerant. These are available in several types with different head line types and inner diameters were selected as test sections. It includes control system, stepper motor, sleeve member and an orifice assembly. The control system provides electronic digital control signals to the stepper motor to control operation of the motor in response to superheat of refrigerant flowing from an evaporator to a compressor of the refrigeration system. It also includes sealing which means to prevent refrigerant flow through when the sleeve member is in its fully closed position.