| 摘要 |
PROBLEM TO BE SOLVED: To reduce fatigue fracture at the joint of a diaphragm and a valve body. SOLUTION: A noncondensive gas and a refrigerant of specified density are encapsulated in an enclosed space 311c and a diaphragm 311a is displaced by the difference of pressure in the enclosed space 311c and refrigerant pressure on the outlet side of a radiator 200 over the entire region from supercritical region to condensation region. Since the resiliency of a resilient member 315 is simply required to support a valve body 313, resiliency of the resilient member 315 acting on the diaphragm 311a through the valve body 313 can be reduced sufficiently. Since the majority of force acting on the diaphragm 311a is the pressure in the enclosed space 311c and the refrigerant pressure on the outlet side of the radiator 200, a force (pressure) can be applied substantially uniformly onto the diaphragm 311a. Furthermore, concentration of stress at the joint of the diaphragm 311a and the valve body 313 can be prevented.
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