Valve plate 17# fits for Common Rail Injector 23670-0E070. The orifice plate has many injection holes formed through it. The small holes are mainly used to accurately control the flow and injection direction of the fuel. When the fuel passes through the valve plate, these small holes will refine and guide the fuel so that it is sprayed at a specific angle and shape to achieve a good atomization effect and promote full mixing of fuel and air.