The air conditioning expansion valve is located at the evaporator inlet. The air conditioning expansion valve controls the flow of refrigerant entering the evaporator based on the cooling load or the evaporators temperature. A metering valve inside the MEI Airsource air conditioning expansion valve moves up and down in the refrigerants flow path opening and closing the pathway inside the air conditioning expansion valve. The internal pathway is smaller than the refrigerant line, causing the pressure to drop, changing it from a high pressure liquid to a low pressure liquid mist. Sensing temperature changes, the metering valve constantly opens or closes as it precisely meters the amount of refrigerant needed. We offer air conditioning expansion valves from MEI Airsource, AC Delco and Motorcraft in a wide variety of types including block type expansion valves, externally equalized expansion valves, and internally equalized expansion valves. Air conditioning orifice tubes and expansion tubes from MEI Airsource consist of a filter screen to remove contaminants, and a calibrated tube to meter refrigerant flow. Like an air conditioning expansion valve, orifice tubes and expansion tubes are mounted on the inlet side of the evaporator. MEI Airsource cycling clutch switch turns the compressor on and off. Cycling clutch switches can be either thermostatic or pressure types. The intermittent air conditioning compressor operation controls the refrigerant flow and pressure. Count on us to provide timely and accurate supplies of MEI Airsource air conditioning expansion valves and orifice tubes.