Air Conditioner Unit; Box Type Expansion Valve - Kubota KX080-3 Workshop Manual

WSM KX080-3 Mechanism
g. Air Conditioner Unit
Air conditioner unit (1) consists of evaporator
(3), expansion valve (4), heater core (2),
blower (5), etc..

(1) Air Conditioner Unit

(2) Heater Core
(3) Evaporator
(4) Expansion Valve
(5) Blower
h. Box type expansion valve
Some recent vehicle models use a box-type
expansion valve. This expansion valve fea-
tures an internal temperature sensing rod
(equivalent to the temperature sensing bulb
found in the conventional expansion valve,
which makes the use of the conventional
capillary tube.). This capillary tube is not
necessary for the box type. In addition, the
box-type construction, in which the refriger-
ant pressure at the evaporator outlet is
applied directly to the temperature sensing
rod side of the diaphragm, makes the use of
the conventional equalizer pipe unneces-
sary.
In operation, the temperature sensing rod
senses the temperature at the evaporator
outlet and transmits to the diaphragm, caus-
ing the pressure of the gas that is contained
in the diaphragm chamber to vary. As a
result, the diaphragm moves, thereby con-
trolling the opening and closing of the valve.
Fig. Box Type Expansion Valve
VI-M-18
VI Air Conditioner
(1)
(4)