Control valve and method for manufacturing control valve

A control valve that controls a flow of a working fluid, comprising:

• a housing that includes a tubular end portion inserted into a mounting hole of a passage formation member, a drain passage through which the working fluid is discharged from the housing to an outside of the passage formation member, and a valve chamber inside the tubular end portion, the passage formation member having an upstream passage through which the working fluid flows toward the housing, and a downstream passage into which the working fluid flows out of the housing;
• an inlet passage provided inside the tubular end portion, the upstream passage communicating with the valve chamber through the inlet passage;
• a valve body having a tubular shape, provided in the valve chamber and movable in an axial direction along which a center line of the valve body extends, the valve body including a first seat surface which is one end face for closing the inlet passage, and a second seat surface which is another end face for closing a valve port communicating with the valve chamber, the valve body being movable between a first position at which the first seat surface closes the inlet passage to block a flow of the working fluid into the valve chamber from the upstream passage and a second position at which the second seat surface closes the valve port to block the flow of the working fluid into the drain passage from the valve chamber;
• and
• a support member that includes a fixed portion fixed to an inner side of the tubular end portion and having the inlet passage extending through the fixed portion, and a support portion extending downstream from the fixed portion and supporting the valve body to be slidable in the axial direction, wherein
• an inner peripheral surface of the valve body has a sliding surface that slides on an outer peripheral surface of the support portion,
• an outer peripheral surface of the valve body has a connection surface which connects the first seat surface and the second seat surface,
• the valve body, which is a resin molded product, includes a skin layer providing the outer peripheral surface of the valve body and a core layer under the skin layer,
• the valve body includes a core exposed portion where the core layer is exposed without being covered with the skin layer and forms a part of the outer peripheral surface of the valve body, and
• the core exposed portion is provided on the connection surface without being provided on the first seat surface, the second seat surface, and the sliding surface.