| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve with a minute opening display function by which a minute opening of a valve body can be visually confirmed, and which can accurately control the valve body to a minute opening position.SOLUTION: A reduction gear 4 comprises: an input shaft 7; an output shaft carrier 8 connected to a valve rod 3; a gear train which forms a prescribed reduction ratio between the input shaft 7 and the output shaft carrier 8; and an opening scale part 61 which shows an opening of the valve body 2; and an opening guideline part 62 which indicates an opening scale of the opening scale part 61. The opening scale part 61 has a full-opening display scale 611 which displays a valve body opening corresponding to a rotation angle of the output shaft carrier 8 in a full-opening range of the valve body 2, and a minute opening display scale 613 which displays a valve body opening corresponding to a rotation angle of the input shaft 7 in a minute opening range. The opening guideline part 62 has a full-opening guideline 621a which indicates the opening of the valve body 2 in the full-opening display scale 611 in synchronization with the rotation of the output shaft carrier 8, and a minute opening guideline 622 which indicates the opening of the valve body 2 in the minute opening display scale 613 in synchronization with the rotation of the input shaft 7. |
