•  When the exhaust gas recirculation system is operated, the intake shutter valve closes, vacuum is generated in the intake manifold, and EGR gas is efficiently transported to the combustion chamber. As a result, NOx is reduced.

•  When the engine is idling, the intake shutter valve closes and reduces air intake noise.

•  When the exhaust gas recirculation system is operated and vacuum is applied to the diaphragm of the intake shutter valve actuator, internal lever is pulled and the intake shutter valve closes.