High temperature fluid control valve device

摘要

A valve disc (4) has a valve shaft (14) perpendicular to a fluid passage. The valve shaft (14) is rotatably supported by a bearing member (6) in a bore (5) of the side wall of a body of a valve device. Seal rings (9,10) are provided in the bore (5) and a retainer (15) is provided for limiting axial movement of the seal rings (9,10). The retainer (15) is pressingly fitted in the bore (5) so that a gap is formed between the retainer (15) and the valve shaft (14) or between the retainer (15) and the inner circumferential surface of the bore (5), thereby minimizing leakage of the fluid and preventing strength of the valve shaft (14) from decreasing. <MATH>