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MAN B&W 1.06
<strong>Th<strong>is</strong></strong> valve complies with our traditional design
principles of compact design and the use of mainly
rotational symmetrical parts. The design <strong>is</strong> based on
the principle used for an early version of a combined
fuel oil/gas injection valve as well as experience
gained with our normal fuel valves.
Gas <strong>is</strong> admitted to the gas injection valve through
bores in the cylinder cover. To prevent gas leakage
between cylinder cover/gas injection valve and
valve housing/spindle guide, sealing rings made of
temperature and gas res<strong>is</strong>tant material are installed.
Any gas leakage through the gas sealing rings will
be led through bores in the gas injection valve and
the cylinder cover to the double�wall gas piping
system, where any such leakages will be detected
by HC sensors.
The gas acts continuously on the valve spindle at a
pressure of about 50� 00 bar. In order to prevent the
gas from entering the control oil activating system
via the clearance around the spindle, the spindle
<strong>is</strong> sealed by means of sealing oil led to the spindle
clearance at a pressure higher than the gas pressure
( 5�50 bar higher).
The fuel (e.g. pilot oil) valve <strong>is</strong> a standard fuel valve
without major changes.
Designs of fuel (e.g. pilot oil) injection valves will
allow operation solely on fuel oil up to MCR. lf the
customer’s demand <strong>is</strong> for the gas engine to run at
any time at 00 % load on fuel oil, without stopping
the engine for changing the injection equipment, the
fuel valve nozzle holes will be as the standard type for
normal fuel oil operation. The fuel oil amount when
operating on gas <strong>is</strong> 5-8%. Gas operation <strong>is</strong> possible
at 0% load and above.
Fuel oil booster system
Dual fuel operation requires a fuel oil pressure
booster, a position sensor, a FIVA valve to control
the injection of fuel oil, and a system oil supply to
an ELGI valve to control the injection of gas. Fig.
7.00.04 shows the design control principle with the
two fuel valves and two gas valves.
Page 6 of 8
No change <strong>is</strong> made to the ME fuel oil pressure
booster, except that a pressure sensor <strong>is</strong> added for
checking the fuel oil injection pressure. The injected
amount of fuel oil <strong>is</strong> monitored by the position sensor.
The injected gas amount <strong>is</strong> controlled by the duration
of control oil delivery from the ELGI valve. The
operating medium <strong>is</strong> the same system oil as <strong>is</strong> used
for the fuel oil pressure booster.
Exhaust Valve
The exhaust valve cons<strong>is</strong>ts of the valve housing and
the valve spindle. The valve housing <strong>is</strong> made of cast
iron and <strong>is</strong> arranged for water cooling. The housing
<strong>is</strong> provided with a water cooled bottom piece of
steel with a flame hardened seat. The exhaust valve
spindle <strong>is</strong> made of Nimonic. The housing <strong>is</strong> provided
with a spindle guide.
The exhaust valve <strong>is</strong> tightened to the cylinder cover
with studs and nuts. The exhaust valve <strong>is</strong> opened
hydraulically by the electronic valve activation system
and <strong>is</strong> closed by means of air pressure.
The operation of the exhaust valve <strong>is</strong> controlled by
the proportional valve which also activates the fuel
injection.
In operation, the valve spindle slowly rotates, driven
by the exhaust gas acting on small vanes fixed to
the spindle.
Indicator Cock
The engine <strong>is</strong> fitted with an indicator cock to which
the PMI pressure transducer can be connected.
MAN B&W Alpha Cylinder Lubricator
The electronically controlled Alpha cylinder lubricating
oil system, used on the MC engines, <strong>is</strong> applied to
the ME engines, including its control system.
MAN B&W ME-GI engines 198 50 59-7.1
MAN Diesel