3WAY VALVE FOR REFRIGERANT [FULL-AUTO AIR CONDITIONER]

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Purpose

•  The 3way valve for refrigerant switches the flow passage of the refrigerant in the refrigerant cycle.

Function

•  The 3way valve for refrigerant switches the flow passage of the refrigerant so that the refrigerant flows to the electric compressor when heating and to the evaporator when cooling.

Structure/construction

•  A normally open solenoid valve has been adopted.
―  Continuity off: Main valve open
―  Continuity off: Main valve close
•  The 3way valve for refrigerant consists of the following parts.
―  Coil
―  Plunger
―  Main valve
―  Main valve spring
―  Sub valve
―  Sub valve spring
―  Differential pressure valve
―  Differential pressure valve spring
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Operation


When heating

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1.  When the coil is turned off (de-energized), the sub valve integrated with the plunger moves upward by the force of the sub valve spring.

(Sub valve spring load is greater than solenoid coil attraction)

2.  The main valve is pushed upward and opens by the force of the main valve spring.

(Main valve spring load is greater than sub valve downward force)

3.  At this time, because the left and right sides of the differential pressure valve have the same pressure (high pressure), the differential pressure valve moves towards the right and closes by the force of the differential pressure valve spring.

4.  The refrigerant flows towards the accumulator when the main valve is open.

•  For the refrigerant flow when heating, refer to [HEATER SYSTEM]. (See HEATER SYSTEM.)


When cooling

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1.  When the coil is turned on (energized), the sub valve integrated with the plunger is pulled downward and the sub valve is closed.

(Sub valve spring load is less than solenoid coil attraction)

2.  The main valve is pushed downward and closes by the force of the sub valve.

(Main valve spring load is less than sub valve downward force)

3.  At this time, because the sub valve is closed, the pressure on the left side of the differential pressure valve is low and the pressure on the right side is high.

4.  The differential pressure valve moves to the left and opens due to the difference in the left and right pressures.

5.  The refrigerant flows towards the evaporator when the differential pressure valve is open.

•  For the refrigerant flow when cooling, refer to [REFRIGERANT SYSTEM]. (See REFRIGERANT SYSTEM.)