| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve gear for preventing an unexpected shutdown caused by damage of a pipeline in a passage for circulating a liquid.SOLUTION: A valve gear includes: a valve body storage part 120 disposed in a passage; and a valve body 110a which includes a gap functioning as a passage and rotates in the valve body storage part 120 to change valve opening. The valve body storage part 120 includes a replacement inner wall part 1264, which forms a part of an inner wall of the valve body storage part 120 and is replaceably formed, at a position where flow of a fluid passing through a narrow passage portion C min is received. |
