Expansion Valve - Audi TT Coupé 207 Service

Heating/air conditioning system

Expansion valve

The expansion valve is located directly in
front of the evaporator between the high pres-
sure and low pressure sides of the refrigerant
circuit.
to compressor
Pressure equalisation
bores
from condenser
Lack of thermal insulation will lead to
a change in the control characteristic
setting.
The cooling output of the air condi-
tioning system is reduced.
82
Control unit
Ball valve
The expansion valve is thermostatically regu-
lated. It has a control unit with a thermostatic
valve element and a ball valve.
The thermostatic valve element on one side of
the diaphragm has a special gas filling.
The other side is connected to the evaporator
outlet (low pressure) via pressure equalisation
drillings.
The ball valve is activated by a push rod.
Gas-filled thermostatic
valve element
from evaporator
Diaphragm
Push rod
to evaporator
SSP207/44