Component description for the aspirator shutoff valve with integral check valve - GF14.30-P-2100BK

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ENGINE 113.967 in MODEL 219

ENGINE 113.964 in MODEL 164.1

ENGINE 113.971 in MODEL 251

Fig 1: Identifying Aspirator Shutoff Valve

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Location

One aspirator shutoff valve is located at the front at the cylinder head for each cylinder bank.

Task

Opens up the route during air injection for the injected air.

To prevent suction of air into the outlet ducts, due to streaming of exhaust gases, when the air pump is switched off.

Design

Fig 2: Aspirator Shutoff Valve Operation Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Function

Both air shutoff valves are opened simultaneously via the air pump switchover valve by vacuum pressure. During ventilation using vacuum pressure, they are closed by spring force.

The injected air from the air pump flows to the outlet ducts on each cylinder head when the valve plate is raised. When air injection is off, the check valve prevents the admission of exhaust gas in the air shutoff valves and thus protects these from dirt and thermal destruction.