Gaseous fuel injection valve

摘要

A gaseous fuel injection valve includes: a valve housing; a metallic nozzle member having a flat valve seat and a nozzle bore passing through a central portion of the valve seat; a valve body provided at one end face with a rubber seating member which is operated in cooperation with the valve seat; a coil; and a return spring for urging the valve body toward the valve seat. A stationary core attracts the valve body to move the seating member away form the valve seat, when the coil is excited. In this injection valve, a flourine resin valve seat coating is formed on the valve seat so that the seating members brought into close contact with the valve seat coating. Thus, an oil-repellent property of the valve seat coating is provided to the valve seat to prevent adherence of oil to the valve seat, leading to an improvement in valve-opening response of the valve body upon the excitation of the coil.