| 摘要 |
PROBLEM TO BE SOLVED: To directly confirm an opened/closed state of a gas shut-off valve with eyes.SOLUTION: In a housing 1 of a gas shut-off valve, an opening part 1b is formed at a position on the lateral side of a valve seat 5. The opening part 1b has a small-diameter opening part 1c, and a large-diameter opening part 1d in which a female screw is formed. A cylindrical member 32 screwed into the large-diameter opening part 1d is fixed so as to hold a glass plate 31 between itself and the small-diameter opening part 1c.SELECTED DRAWING: Figure 2 |
