| 摘要 |
A control valve (1) of an embodiment includes a disc (29) coaxially in contact with a diaphragm (28), and a shaft (33) configured to transmit a drive force in an axial direction caused by displacement of the diaphragm (28) to a valve element (18). The diaphragm (28) has a corrugated portion (62) between a flat portion (64) and the outer peripheral portion (66), the flat portion (64) having a contact surface with which the disc (29) is in contact. The corrugated portion (62) includes substantially N+0.5 corrugations (72, 74) (N being a natural number) each protruding relative to a reference surface (70), the corrugations being formed between the outer peripheral portion (66) and the flat portion (64), the reference surface (70) being one surface of the outer peripheral portion (66). A height of each of the N corrugations (72) of the corrugated portion (62) is smaller than a height of the flat portion (64), the heights each being a height relative to the reference surface (70) in an unloaded condition. |
