Focus L4-2.0L SOHC VIN P (2000)
Expansion Block/Orifice Tube: Description and Operation
Fixed Orifice Tube
Installation Position In The Refrigerant Circuit
In the line between the condenser and the evaporator.
Function
The fixed orifice tube has the following functions:
^Limits the amount of flow into the evaporator.
^Expands the refrigerant to low pressure.
Function
The liquid refrigerant flows under high pressure from the condenser to the inlet side of the fixed orifice tube. Two O-rings prevent the refrigerant from
flowing past the fixed orifice tube. Two filters at the entrance and outlet of the fixed orifice tube remove any particles from the refrigerant. The filter at
the outlet also atomizes the refrigerant. Only the quantity of refrigerant corresponding to the pressure can ever flow through the calibrated internal
diameter of the fixed orifice tube. As a result, the amount of flow through the tube is restricted. The internal diameter of the fixed orifice tube
corresponds to the required refrigeration power in the air conditioning system.
