| 摘要 |
A controller, comprising a power boosting means (5) having a tapered member (41) extending from the lower end of an operating shaft (3) downward, a disk-like member (42) provided at the upper end of a valve stem (16), and front and rear swing bodies (43, 44) disposed between the both members (41, 42) through the tapered member (41) so as to be opposed to each other and rotatable around swing shafts (45, 46), the swing bodies (43, 44) further comprising plate-like bodies (43a, 44a), upper contact faces (43b, 44b) formed on the upper parts of the bodies and allowed to abut on the tapered face of the tapered member (41), and lower contact faces (43c, 44c) formed on the lower parts of the bodies and allowed to abut on the upper face of the disk-like member (42), wherein the lower contact faces (43c, 44c) of the swing bodies are formed in the cam faces of arc shapes having their centers at center axes positioned eccentric from the axes of the swing shafts (45, 46). |
