5.2.4 Direct controlled 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 ECS controls the solenoid valve and thus the
pilot valve of the injection valves. This controls the timing and the quantity of the injected fuel
related to the power.
When the pilot valve opens, the high pressure of the supplied fuel opens the needle in the
nozzle body (005, Figure 5-10). This lets the fuel flow through the holes in the nozzle tip (006)
into the combustion chamber as a spray. When the pilot valve closes, the fuel pressure closes
the needle again.
A small quantity of control fuel flows from the pressurized annular groove (004) through the
return pipe to the plant fuel system.
Fuel leakage with a small quantity of lubricating oil flows from the depressurized annular groove
(003) through drain pipes to the plant overflow tank.
Oil from the main oil supply lubricates the control element in the injection valves. If for the
engine it is necessary to stop the oil flow after engine stop, a solenoid valve is installed in the oil
supply pipe. Thus this solenoid valve closes, when the engine has stopped. This prevents that
the temperature of the remaining fuel in the injection valves decreases too much.
Fig 5-10 Injection valve (example)
001 002 003 004 006005
007
009
008
Legend
001 Annular groove - oil return 006 Nozzle tip
002 Annular groove - oil inlet 007 Electrical cable to control valve
003 Annular groove - fuel leakage 008 Fuel inlet
004 Annular groove - control fuel return 009 Valve bush
005 Nozzle body
X35-B
AA00-2722-00AAA-043A-A
Operation Manual Direct controlled injection valve
Winterthur Gas & Diesel Ltd.
- 150 - Issue 001 2019-10
To Next Page
Loading...
