| 摘要 |
PROBLEM TO BE SOLVED: To prevent the assembly failure of a stem and a ball valve of a ball valve.SOLUTION: A ball valve includes a stem 100 rotatably driven by a geared motor 60 and a ball valve 30 rotatably driven by the stem 100. A driving side joint part 110 is formed at a leading end of the stem 100, and a driven side joint part 120 is formed in the upper part of the ball valve 30. The driving side joint part 110 and the driven side joint part 120 are formed into a shape so as to be connected with an attitude at one place only in a rotational plane. |
