PURPOSE: To effectively reduce force in the axial direction by analyzing fluid flow with respect to the spool opening of an orifice section.

CONSTITUTION: An inlet port 13 and an outlet port 14 are provided while being adjacent to the valve chamber of a valve main body 11, a spool 20 is inserted into the insides of these ports 13 and 14, an orifice section is so constituted as to regulate pressure by a land 22 within the outlet port 14 and the valve main body 11, and the opening of the spool is so constituted as to regulate pressure by the movement of the spool 20, and a bucket 26 which is small in diameter while being wide and deep as specified, is formed over the land 22 within the outlet port 14, so that force in the axial direction of the spool is reduced by fluid force around the bucket section.