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MAN B&W 1.06
From the accumulator, the gas passes through
a bore in the valve block to the shut down valve,
which in the gas mode, <strong>is</strong> kept open by compressed
air. From the shutdown valve (V4 in Fig.
7.00.0 ), the gas <strong>is</strong> led to the gas injection valve
via bores in the valve block and in the cylinder
cover. A blow�off valve (V in Fig. 7.00.0 ), placed
on the valve block, <strong>is</strong> designed to empty the gas
bores when needed.
A purge valve (V5 shown in Fig. 7.00.0 ), which
<strong>is</strong> also placed on the valve block, <strong>is</strong> designed to
empty the accumulator when the engine <strong>is</strong> no
longer to operate in the gas mode.
Fuel Valves, Gas Valves and
Starting Air Valve
The cylinder cover <strong>is</strong> equipped with two or three fuel
oil valves, two or three gas valves, starting air valve,
and indicator cock.
The opening of the fuel valves <strong>is</strong> controlled by the
high pressure fuel oil created by the fuel oil pressure
booster, and the valves are closed by a spring.
The opening of the gas valve <strong>is</strong> controlled by the
ELGI valve, which operates on control oil taken from
the system oil.
An automatic vent slide allows circulation of fuel
oil through the valve and high pressure pipes when
the engine <strong>is</strong> stopped. The vent slide also prevents
the compression chamber from being filled up with
fuel oil in the event that the valve spindle sticks. Oil
from the vent slide and other drains <strong>is</strong> led away in
a closed system.
The fuel oil high�pressure pipes are equipped with
protective hoses and are neither heated nor insulated.
The mechanically driven starting air d<strong>is</strong>tributor used
on the MC engines has been replaced by one solenoid
valve per cylinder, controlled by the CCUs of
the Engine Control System.
Slow turning before starting <strong>is</strong> a program incorporated
into the basic Engine Control System.
Page 5 of 8
The starting air system <strong>is</strong> described in detail in Section
.0 .
The starting valve <strong>is</strong> opened by control air and <strong>is</strong>
closed by a spring. The integrated Engine Control
System controls the starting valve timing.
Fuel injection valves
Dual fuel operation requires valves for both the injection
of fuel oil (incl. pilot oil) and gas fuel.
The valves are of separate types, and two are fitted
for gas injection and two for fuel oil. The media
required for both fuel and gas operation <strong>is</strong> shown
below:
• High�pressure gas supply
• Fuel oil supply (pilot oil)
• Control oil supply for activation of gas injection
valves
• Sealing oil supply.
The gas injection valve design <strong>is</strong> shown in
Fig. .06.0 .
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MAN B&W ME-GI engines 198 50 59-7.1
MAN Diesel
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Fig. 1.06.01: Gas injection valve
178 53 64�5.0