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The expansion valve or orifice tube represents the point of separation
between the high pressure and low pressure sections in the
refrigerant circuit and is installed before the evaporator. The liquid
refrigerant is injected into the evaporator through the expansion
valve or orifice tube. The refrigerant expands,
evaporates and thus releases evaporation cooling.
In order to achieve optimum cooling capacity in the evaporator,
the refrigerant flow is controlled by the expansion valve or orifice
tube. Humidity and impurities in the air conditioning system can
extremely impair the functionality of expansion valves or orifice
tubes and lead to functional problems.
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