Valve device

Abstract

Provided is a valve device in which a valve body can come into close contact with a valve seat to reliably close the valve even if a shaft moves slightly off-axis or tilted. In a valve device including: a housing 10 defining an upstream passage 12a and downstream passages 13a and 14a through which a fluid passes, and valve seats 11d and 11e interposed between the upstream passage and the downstream passages; a shaft 60 reciprocating along a predetermined axis S; and valve bodies 20 and 30 fixed to the shaft and seated on and separated from the valve seats, the valve seats 11d and 11e are formed into annular tapered surfaces forming a part of conical surfaces centered on the axis, and the valve bodies 20 and 30 are formed to include convex curved surfaces 22a and 32a that come into contact with the annular tapered surfaces when seated.

Dependencies are inferred from the claim text.