Valtra VALMETSERIES Service Manual page 9

83. Air conditioner
Expansion valve
5
2
Temperature sensor
Diaphragm
To compressor
From condenser
1. 1. 1994
1
When the compressor starts pressure drops in the evap-
orator and the diaphragm pushes the pin downwards and
the ball opens. Refrigerant can now flow via the spring
housing into the evaporator
When the temperature in the evaporator outlet pipe
lowers, the temperature sensor pulls the diaphragm
From evaporator
upwards and the valve ball closes preventing refrigerant
from flowing into the evaporator.
In this way the expansion valve regulates all the time the
amount of refrigerant in the evaporator.
On the later air conditioner, the expansion valve functions
in a similar way.
To evaporator
Note! The expansion valve and the metal pipes have
been covered with insulating mass 30794000.
1141
Model Code
6000-- 8750 830
4
3
Figure 5. Expansion valve
1. Expansion valve
2. Hose from condenser
3. Inlet pipe to evaporator
4. Outlet pipe from evaporator
5. Hose to compressor suction side
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