Expansion valve, component description - GF83.40-P-2190CW
MODEL 204.0 /2 up to Model Year 08 /Modification Year 07
Location
The expansion valve is centrally located in the radiator tank underneath the windshield wiper mechanical system.
Task
The expansion valve sprays liquid refrigerant into the evaporator. The injection quantity depends on the pressure and temperature of the refrigerant supplied.
Function
When the refrigerant compressor (A9) is switched on, the pressure in the evaporator decreases, causing a diaphragm in the expansion valve to arch. The diaphragm motion is transferred to a linkage. The linkage presses the valve ball out of its seat opening the valve. The opened valve enables the refrigerant to be sprayed into the evaporator. Because the motion of the diaphragm depends on the suction pressure as well as the temperature at the evaporator outlet, only the quantity of refrigerant which can evaporate optimally is injected.