Abstract: In a method of manufacturing a pressure control valve, wherein a fuel introduction path and a fuel discharge path are formed in a housing; a spherical valve body mounting portion is formed in the fuel discharge path; and a spherical valve body is mounted to the spherical valve body mounting portion, previously, an annular rib is formed on a diaphragm and an annular groove is formed on the housing. Thereafter, the annular rib of the diaphragm is coupled into the annular groove of the housing to position the diaphragm, and vacuum suction is performed from the fuel introduction path to thereby the pressure in the housing and attract a diaphragm unit to the housing. In this state, a case is put on the housing, and this case is caulked to simultaneously fix the diaphragm and the case to the housing.

Abstract: In a method of manufacturing a pressure control valve wherein a fuel introduction path and a fuel discharge path are formed on a housing, a spherical valve body mounting portion is formed in the fuel discharge path and a spherical valve body is mounted on the valve body mounting portion, the spherical valve body itself is used as a jig for forming a valve seat surface, a pushing force is applied to the spherical valve body mounted on the spherical valve body mounting portion to punch it to form a valve seat surface having a concave spherical surface meeting a convex spherical surface of the spherical valve body is formed on a wall surface of the housing produced by aluminium die cast. An annular stepped portion is formed on the boundary between a valve seat surface of the spherical valve body mounting portion and a valve spring mounting portion.

Abstract: A fuel pressure control valve wherein a pipe press-fit opening 15a is formed on a housing 11 constituting a control valve chamber 16 together with a diaphragm 12, a mounting flange 26 is projectedly provided on the outer surface of this housing 11 and a return pipe 17 is press-fitted into a pipe press-fit opening 15a. A boss portion 33 is expandedly provided at a rear surface of the housing 11, which is opposite to the mounting flange 26, and seat surfaces 32 and 34 for receiving a jig during press-fitting of the return pipe 17 into the pipe press-fit opening are formed at end faces of the mounting flange 26 and the boss portion 37, in a flat plate shape and in a parallel alignment between one end face with the other.