MAN B&W
1.06
Page 6 of 7
MAN Diesel
198 89 14-5.2
MAN B&W 90-50ME-C8-GI TII .2 and higher
An ELGI and ELWI valve and control oil supply are
also incorporated in the gas control block.
The gas pressure in the channel between the gas
injection valve and the window valve is measured.
The pressure measuring is used to monitor the
function of and to detect a leaking window valve,
gas-injection valve or blow-off valve.
Any larger pressure increase would indicate a se-
vere leakage in the window/shut down valve and a
pressure decrease would indicate a severe leak-
age in the gas injection valve seats or in the blow-
off valve. The safety system will detect this and
shut down the gas injection.
From the accumulator, the gas passes through a
bore in the gas control block to the window valve,
which in the gas mode is opening and closing
in each cycle by hydraulic oil. From the window/
shutdown valve, the gas is led to the gas injection
valve via bores in the gas control block and in the
cylinder cover. A blow-off valve placed on the gas
control block is designed to empty the gas bores
during gas standby or gas stop.
A purge valve, also placed on the gas control
block, is designed to empty the accumulator when
the engine is no longer to operate in the gas mode.
Both hydraulically actuated blow-off and purge
valves are also utilised during inert gas purging,
all controlled by the gas injection engine control
system (ME-GI-ECS).
Fuel Valves, Gas Valves and Starting Air Valve
The cylinder cover is equipped with two or three
fuel valves, two or three gas valves, a starting air
valve and an indicator cock.
The opening of the fuel valves is controlled by the
high pressure fuel oil created by the fuel oil pres-
sure booster, and the valves are closed by a spring.
The opening of the gas valves is 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 the high pressure pipes
when the engine is 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 is led away in a closed system.
Supply of starting air is provided by one solenoid
valve per cylinder, controlled by the CCUs of the
Engine Control System.
The starting valve is opened by control air, timed
by the Engine Control System, and is closed by a
spring.
Slow turning before starting is a program incorpo-
rated in the basic Engine Control System.
The starting air system is described in detail in
Section 13.01.
Exhaust Valve
The exhaust valve consists of the valve housing
and the valve spindle. The valve housing is made
of cast iron and is arranged for water cooling. The
housing is provided with a water cooled bottom
piece of steel with a flame hardened seat. The
exhaust valve spindle is a DuraSpindle (Nimonic
on S80 and engines type 65-50, however) and the
housing provided with a spindle guide.
The exhaust valve is tightened to the cylinder
cover with studs and nuts. The exhaust valve is
opened hydraulically by the electronic valve acti-
vation system and is closed by means of air pres-
sure.
The operation of the exhaust valve is controlled by
the FIVA valve, which also activates the fuel injec-
tion.
In operation, the valve spindle slowly rotates, driv-
en by the exhaust gas acting on small vanes fixed
to the spindle.
Summary of Contents for S65ME-C8.2-GI-TII
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Page 11: ...MAN B W MAN Diesel Engine Design 1...
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Page 29: ...MAN B W MAN Diesel Engine Layout and Load Diagrams SFOC 2...
Page 30: ......
Page 53: ...MAN B W MAN Diesel Turbocharger Selection Exhaust Gas By pass 3...
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Page 59: ...MAN B W MAN Diesel Electricity Production 4...
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Page 101: ...MAN B W MAN Diesel Installation Aspects 5...
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Page 145: ...MAN B W MAN Diesel List of Capacities Pumps Coolers Exhaust Gas 6...
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Page 165: ...MAN B W MAN Diesel Fuel 7...
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Page 207: ...MAN B W MAN Diesel Lubricating Oil 8...
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Page 229: ...MAN B W MAN Diesel Cylinder Lubrication 9...
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Page 239: ...MAN B W MAN Diesel Piston Rod Stuf ng Box Drain Oil 10...
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Page 243: ...MAN B W MAN Diesel Central Cooling Water System 11...
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Page 249: ...MAN B W MAN Diesel Seawater Cooling System 12...
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Page 263: ...MAN B W MAN Diesel Starting and Control Air 13...
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Page 269: ...MAN B W MAN Diesel Scavenge Air 14...
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Page 281: ...MAN B W MAN Diesel Exhaust Gas 15...
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Page 295: ...MAN B W MAN Diesel Engine Control System 16...
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Page 317: ...MAN B W MAN Diesel Vibration Aspects 17...
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Page 333: ...MAN B W MAN Diesel Monitoring Systems and Instrumentation 18...
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Page 361: ...MAN B W MAN Diesel Dispatch Pattern Testing Spares and Tools 19...
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Page 381: ...MAN B W MAN Diesel Project Support and Documentation 20...
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Page 391: ...MAN B W MAN Diesel Appendix A...
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