are assembled to base 22 at the upper end face of the base by fastening the cover to the base before elbow 24 is placed on the lower face of base 22 double pintle 42 is assembled into the valve through the open lower end face of the base stem 44 passes through the guide bore in bearing 40 and into the interior of the actuator where it attaches to the solenoid armature with the solenoid not being energized each of the two pintles 46 48 seats on a respective seat closing the respective opening or through hole circumscribed by the respective seat the armature is spring biased to urge the pintles against the seats with an appropriate amount of force it can be appreciated that the outside diameter of upper pintle 46 is less than that of the through hole circumscribed by lower seat 56 so that the former can pass through the latter during assembly of the double pintle into the valve thereafter elbow 24 is fastened to base 22 to complete the assembly valve is substantially force balanced because of the particular double pintle design when inlet port 28 is communicated to the engine exhaust system so that hot engine exhaust gases can enter the valve the pressure of those gases acting on the pintles creates forces that are substantially equal in magnitude but in opposite directions along axis 32 although the upward force acting on pintle 48 will have a slightly larger magnitude than the downward one acting on pintle 46 hence pressure pulses will at most have a.