AUX air conditioner service manual
⑺The stop valve
For controlling the braking of the refrigerant existing in the pipes of the refrigeration system, and
switching its flowing direction for the purpose of switching the heating and refrigerating function of
the air-conditioner as well as easy service operation, there are various types stop valve units are
amounted in the pipelines of the air-conditioner’s refrigeration system. The most important includes
the electromagnetic reversing valve, single direction valve and cut-off valve etc.
①the electromagnetic reversing valve it’s mainly applied in the heat pump air-conditioner. Since there
are four main pipelines connect to it regarding to the structure, it is usually called four-way valve. It is
used to changes the function of the condenser and evaporator and realize the shift between the
air-conditioner’s functions of refrigerating, heating or defrosting etc. through the way of changing the
direction of the flow of the refrigerant in the system. Refer to the below picture 2-8 for the figure of
the electromagnetic reversing valve.
The electromagnetic reversing valve consists of two parts. One is the solenoid guiding valve; the other
one is four- way commutating valve. The solenoid guiding valve usually controls the four-way valve
by three guiding capillary tubes. The structure is as the above picture:
From the picture, we can see the solenoid guiding valve consists of the valve bowl, spring, iron core
and electromagnetic loop, there are four valve bores on the valve body connecting with the guide
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