Valtra VALMETSERIES Service Manual - page 9
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
From condenser
To evaporator
From evaporator
To compressor
Temperature sensor
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
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.
Note! The expansion valve and the metal pipes have
been covered with insulating mass 30794000.
Diaphragm
1141
Model
Code
Page
83. Air conditioner
1. 1. 1994
6000--8750
830
7
Expansion valve
1
2
3
4
5