Patent ID: 8662472

Claim:
An electromagnetic fuel injection valve, in which: a valve housing includes: a tubular valve seat member having a valve seat in a front end portion thereof; a magnetic cylindrical body coaxially connected to a rear end portion of the valve seat member; a nonmagnetic cylindrical body coaxially and liquid-tightly welded to a rear end of the magnetic cylindrical body; and a hollow cylindrical stationary core coaxially and liquid-tightly welded to a rear end of the nonmagnetic cylindrical body, a valve assembly is housed in the valve housing and includes: a valve body capable of being seated on the valve seat; and a movable core connected to a rear end of the valve body and opposed to a front end of the stationary core, and a stopper member is provided to the valve housing so as to make the valve body abut against the stopper member and thus to restrict an opening stroke of the valve body, wherein each of the valve body and the valve seat member is made of a martensitic stainless steel, and wherein the valve body and the valve seat member are respectively made of different martensitic stainless steels so that a hardness of the valve body is higher than that of the valve seat member, wherein the stopper member is made of a martensitic stainless steel different from the martensitic stainless steel used for the valve body so that a hardness of the stopper member is lower than that of the valve body.