5.2.5 Conventional injection valve
The injection valves are installed in the cylinder cover of each cylinder. The injection valves
spray the fuel into the combustion chamber. The injection control unit (ICU) controls the timing
and the quantity of the injected fuel related to the power.
The high pressure of the supplied fuel from the ICU opens the needle in the nozzle body. This
lets the fuel flow through the holes in the nozzle tip (004, Figure 5-11) into the combustion
chamber as a spray. When the pressure from the ICU decreases, a spring closes the needle
again.
The nozzle usually has the Fuel Actuated Sacless Technology (FAST) for better combustion
properties.
A small quantity of fuel flows through the inner part of the valve to lubricate the needle. This fuel
then flows through the return pipe back to the plant fuel system.
Fig 5-11 Injection valve (example)
Legend
001 Nozzle holder 004 Nozzle tip
002 Coupling nut 005 Fuel inlet
003 Clamping nut
X92DF
AA00-2722-00AAA-043B-A
Operation Manual Conventional injection valve
Winterthur Gas & Diesel Ltd.
- 166 - Issue 002 2020-08
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