| 摘要 |
PROBLEM TO BE SOLVED: To prevent the fatigue fracture of a curved part in a diaphragm. SOLUTION: A pressure control valve is provided with a plate 328 having a deformation restraining part 328a for restraining the deformation of a diaphragm 325, until the radius of curvature of a curved part 325a becomes out of a predetermined range (until the curved part 325a becomes a part of a flat plate substantially), and arranged between the diaphragm 325 and an upper side supporting member 326. According to this constitution, the curved part 325a can be prevented from being deformed largely. Accordingly, the fatigue fracture of the curved part 325 in an early period can be prevented even when the starting and stopping of a compressor (refrigerating cycle) are repeated whereby the durability of the diaphragm 325 can be improved.
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