Pressure control valve for refrigerating system

摘要

A pressure control valve (3) controlling the temperature and pressure at the outlet side of a heat emitter (2) so as to enable efficient operation by a CO2 system operating at the super critical region, wherein CO2 is sealed in a closed space (305) at one side of a diaphragm (306) moving the valve element (304) at a density of approximately 600 kg/m<3>, a through member (313) made of a material with a high heat conductivity is provided extending between the inside and outside of the closed space (305), and step differences are eliminated at the contact surfaces to improve the durability of the diaphragm (306). <IMAGE>