| 摘要 |
A valve device comprises: a valve chamber having an inlet port at one end and a valve seat at the other end; a valve housing containing the valve chamber; the valve chamber accommodating a spherical valve element which performs opening and closing operation to the valve seat, and a valve spring which urges the valve element in a closing direction; and a push rod which penetrates a center hole of the valve seat and pushes the valve element in an opening direction. A cylindrical valve guide member is fit into the valve chamber, the cylindrical valve guide member including a plurality of guide projections on an inner peripheral surface to guide opening and closing operation of the valve element. Grooves between the plurality of guide projections serve as passages providing communication between the inlet port and the valve seat. Thus, it is possible to provide a valve device which can open and close the spherical valve element in an appropriate posture without lateral oscillation while securing the passages between the inlet port and the valve seat of the valve chamber.
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