| 摘要 |
The mechanically driven pump is provided with a delivery chamber which communicates with an annular groove about a valve needle of the injection valve to deliver pressurized hydraulic medium to prevent an inflow of liquid fuel between the valve needle and the injection valve body. The hydraulic pressure medium of the mechanically driven pump also drives a reciprocating piston in the hydraulic pump used to pump the fuel to the injection valve and, thus, also provides a barrier to the passage of liquid fuel between the reciprocating piston and the surrounding wall of the pump.
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