Patent ID: 7607315
Filing Date: 2009-10-27
Classification: F25B

Abstract:
1. A pressure control valve for a vapor-compression refrigerant cycle system that includes a refrigerant radiator in which refrigerant having a pressure higher than a critical pressure, compressed by a refrigerant compressor, flows, the pressure control valve comprising: a valve portion disposed in a refrigerant passage from the refrigerant radiator to a suction port of the refrigerant compressor, wherein: the valve portion controls a refrigerant pressure at an outlet of the refrigerant radiator in accordance with a refrigerant temperature at the outlet of the refrigerant radiator; the valve portion has a control pressure characteristic in which a pressure change relative to a temperature change is smaller than that of the refrigerant; the refrigerant radiator is configured in the vapor-compression refrigerant cycle system to radiate heat to an object to be heated; and the valve portion controls the refrigerant pressure at the outlet of the refrigerant radiator to be higher than a pressure value at which the coefficient of performance of the vapor-compression refrigerant cycle system becomes maximum, when a temperature of the outside air is lower than a predetermined temperature.