Function of the injection system - ra07086020010x(0010)
WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.
H. Reverse flow damping valve in delivery valve holder - Engines 602.96, 603.96/97 TURBO (Model 463.3: pay attention to deviations)
H. Reverse flow damping valve in delivery valve holder
Reverse flow damping valves (7b) are installed in the delivery valve holders (7) of the injection pump in order to reduce the hydrocarbon portion in the exhaust gas. They prevent any after-spraying of the injection nozzles.
Two annular grooves act as identification marks on the delivery valve holder (7) (arrows). The reverse flow damping valve (7b) is a disc valve (7c) opening in the direction of the injection nozzle with a restriction orifice of 0.5 mm dia. The valve seat (7d) is riveted into the delivery valve holder.