Pin-fastening structure for valve shaft and valve body

A pin-fastening structure for a valve shaft and a valve body, the pin-fastening structure comprising:

• a shaft portion provided in either one of a valve body that pivots or reciprocates inside a valve box and a valve shaft that pivots or reciprocates in conjunction with the valve body, the shaft portion being positioned coaxially with an axis that serves as a reference for pivoting or reciprocating;
• a cylindrical portion into which the shaft portion is fitted, the cylindrical portion being provided in, of the valve body and the valve shaft, another one in which the shaft portion is not provided;
• and
• a connecting pin that passes through both the shaft portion and the cylindrical portion in a state in which the shaft portion is fitted into the cylindrical portion and that restricts relative movement of the shaft portion and the cylindrical portion in an axial direction,
• wherein the shaft portion has a first end surface perpendicular to the axis,
• wherein the cylindrical portion has a second end surface perpendicular to an axis of the cylindrical portion, and
• wherein the shaft portion and the cylindrical portion are fastened by the connecting pin in a state in which the first end surface and the second end surface are in contact with each other.