FLUID PASSAGE CONNECTING DEVICE

摘要

PROBLEM TO BE SOLVED: To restrict an excessive increase in a cross-sectional area of a fluid passage without impairing a sealing property.

SOLUTION: A connecting device 16 of a fluid passage includes a convex portion 22 and a concave portion 32 into which the convex portion 22 is inserted. A ring member 8 is disposed between the convex portion 22 and the concave portion 32. The ring member 8 is disposed closer to passage holes 24 and 34 side than an O-ring 7. The ring member 8 does not contribute to sealing. The ring member 8 restricts an excessive increase in a cross-sectional area of a passage between the convex portion 22 and the concave portion 32. The ring member 8 has an inner surface 83 smoothly connecting the passage hole 24 and the passage hole 34. A plurality of projection parts 82 hold the ring member 8 on the convex portion 22 during an assembling process. The ring member 8 includes a discontinuity part 89 which facilitates the deformation of the ring member in the radial direction. The ring member 8 restricts an excessive increase in the cross-sectional area of the passage and restricts the generation of noise.

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