Pressure control valve

摘要

The invention provides a pressure control valve which can be made of aluminum as much as possible and has a comparatively light weight and wherein a seat member made of steel can be force fitted into a spool of aluminum at a room temperature. The pressure control valve includes a relief valve in a spool which is formed from aluminum. A sleeve made of steel is force fitted at a room temperature into a portion of an inner face of the spool in which a seat is inserted. The end portion of the spool in which the seat is inserted is bent by caulking to prevent coming off of the seat.