Patent ID: 6574976
Filing Date: 2003-06-10
Classification: B60H,F25B

Abstract:
A valve device for a refrigerant cycle system which switches an operation mode between a cooling mode where air is cooled by evaporating low-pressure refrigerant in an evaporator and a heating mode where air is heated in the evaporator by using gas refrigerant directly introduced from a compressor, the valve device comprising:a solenoid valve for opening and closing a refrigerant passage between a discharge side of the compressor and a condenser cooling and condensing refrigerant in the cooling mode; a differential pressure valve disposed to be opened by a pressure difference between the discharge side of the compressor and the condenser, generated when the solenoid valve is closed, in such a manner that gas refrigerant discharged from the compressor is directly introduced into the evaporator when the differential pressure valve is opened; a check valve disposed to prevent refrigerant at the discharge side of the compressor from flowing into the condenser when the differential pressure valve is opened; and a housing member for defining a refrigerant passage, by which the solenoid valve, the differential pressure valve and the check valve are integrated to construct an integrated structure.