PURPOSE: To prevent damages such as wears and cracks without generating play in a connecting part even when there is the expansion difference due to the temperature difference between a valve body 4 and a valve stem 7 due to the heat transmitted from the high temperature fluid.
CONSTITUTION: The connection of both end parts of a valve body 4 to the respective corresponding parts of a valve stem 7 is made of tooth profile engagement structure, each tooth profile is formed so that upper and lower tooth profiles 7t of the valve stem 7 may be in an engaging position with upper and lower tooth profiles 4c of the valve body 4 when the valve stem 7 is elastically and torsionally deformed, and the valve body 4 is connected to the valve stem 7 through the torsional elastic deformation of the valve stem 7 and the engagement of each tooth profile.
HASHIMOTO YUKIHIRO
HISAKA NOBORU
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