Patent ID: 7434419

Claim:
A pressure control valve arranged in a refrigerant flow path from a gas cooler to an evaporator of a vapor compression type supercritical refrigeration cycle and controlling a pressure of an outlet side of said gas cooler in accordance with a refrigerant temperature of the outlet side of said gas cooler, wherein refrigerant is sealed in a sealed space above a diaphragm, pressure of a refrigerant in the refrigeration cycle acts on said diaphragm, a valve body opens and closes in accordance with a balance between a pressure of the refrigerant inside the sealed space and a pressure of the refrigerant inside said refrigeration cycle, said sealed space communicates with a part having a temperature sensing function for detecting the refrigerant temperature of the outlet side of the gas cooler, and a volume of the part is at least 50% of a total volume of the refrigerant sealed above the diaphragm.