| 摘要 |
The invention provides an expansion valve equipped to an air conditioning system that has a relief valve for discharging the refrigerant in the system in case of an emergency. An expansion valve 1 controls the flow rate of a refrigerant in a valve chamber 14 into which high-pressure refrigerant is introduced by adjusting the gap between a valve means 40 and a valve seat 16 , and sends the refrigerant into a passage 20 leading to an evaporator. A solenoid relief valve 100 has a plunger 140 operated by a magnet coil 120 , by which a pilot valve seat 152 of a relief valve body 150 is regularly closed. The high-pressure refrigerant introduced to a relief valve chamber 164 of the relief valve body 150 presses the relief valve means 160 , regularly closing the valve of the relief valve seat 28 . When electricity is supplied to a coil 120 , the plunger 140 is attracted toward an attractor 130 and the pilot valve is opened. The relief valve is also opened so that the refrigerant is discharged through a passage 158 to the atmosphere.
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