Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 2000-2003 Approved Subaru Legacy 2000 2000 Service Manual MECHANISM AND FUNCTION SECTION Air Conditioning System MSA5TCD00L18245<< Back
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LEGACY (W2260BE_SGML Complete)
4-7 [M7A0] MECHANISM AND FUNCTION
7. Expansion Valve
7. Expansion Valve
The expansion valve is attached to the evaporator inlet and outlet pipe. It converts high pressure
liquid refrigerant which comes from the liquid tank to misty, low pressure refrigerant, and delivers
to the evaporator. Being at low pressure and low temperature, the liquid refrigerant evaporates
in the evaporator removing heat from the compartment. It automatically controls the flow rate of
refrigerant to obtain the necessary cooling ability required by the fluctuating heat load.
The refrigerant temperature is sensed by the temperature sensing element installed at the low
pressure refrigerant passage in the expansion valve, and the flow rate of the refrigerant is con-
trolled by changing the lift of the valve ball at the high pressure side.
If the heat load of the air conditioner system increases, the refrigerant temperature at the evapora-
tor outlet rises and therefore increases the pressure P1 at around the temperature sensing area.
As this pressure P1 becomes higher than the resultant force of evaporator outlet (low pressure
side) pressure P2 and the spring force F (P1 > P2 + F), the diaphragm is pressed down, opening
the valve ball connected to the diaphragm to increase the flow of the refrigerant.
If the heat load decreases, the action contrary to the one mentioned above takes place, closing
the valve to decrease the flow of the refrigerant.
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