STRUCTURE OF FIXING DIAPHRAGM TO DRIVE SHAFT, METHOD OF FIXING DIAPHRAGM TO DRIVE SHAFT, DIAPHRAGM, AND ELECTROMAGNETIC CONTROL VALVE

摘要

PROBLEM TO BE SOLVED: To improve the pressure resistance and durability of a diaphragm in an electromagnetic control valve configured to cancel a force acting on a valve body by a pressure difference using the diaphragm.SOLUTION: A diaphragm 4 is constituted by a base cloth 4A and a rubber layer 4B. An opening 4B1 is formed only in the rubber layer 4B at a center thereof, and an exposed portion 4A1 of the base cloth 4A is exposed to the opening 4B1. A needle cap 40 is attached to an end portion of a connecting shaft 321 of a valve body 31. A center of the exposed portion 4A1 of the base cloth 4A of the diaphragm 4 is stuck into the needle cap 40 and the connecting shaft 321 to pass through the needle cap 40 and the connecting shaft 321. A coupling hole of the valve body 31 if fitted into the connecting shaft 321. A lower end portion of the connecting shaft 321 is caulked.SELECTED DRAWING: Figure 4