| 摘要 |
A valve main body where an opening of a passage is formed comprises a clamp seat portion adapted to clamp a disk valve, the opening, a non-annular first seat portion where the disk valve can be seated, and an annular second seat portion, which are formed in this order from the inner circumferential side. The first seat portion has an axial height equal to or higher than the axial height of the clamp seat portion and lower than the axial height of the second seat portion.
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