KAESER KOMPRESSOREN M250, Руководство оператора, Страница: 65 / 426

4.7.4.1 Option lb
Engine air shut-off valve
If flammable gases and vapours are drawn by the diesel engine from the environment into the air
intake, they will act like additional fuel. This causes a sudden and uncontrolled increase in engine
speed that can result in serious mechanical damage. Without appropriate preventive measures, the
engine and the engine-driven devices can be destroyed. Explosion or fire are also possible.
When flammable gas is drawn into the engine, shutting off the fuel supply will no longer stop the
engine. In order to shut down the engine quickly and reliably in these events, the intake of the com‐
bustion air must be interrupted.
If a certain engine speed is exceeded, the engine air throttle valve will close automatically. The
feed of intake air is interrupted and causes the engine to immediately stand still.
Manual actuating the engine air shut-off valve:
The engine air intake shut-off valve may also be operated manually. Pulling a wire pull lever closes
the intake valve.
Thermal overload of the engine.
Damage to the turbo charger by abrupt engine shut-down after high loading.
➤ Use the wire pull handle only in an emergency when the surrounding air contains a flam‐
mable gas.
➤ Do not use the wire pull handle as the normal means of shutting down the machine.
Fig. 15 Access engine air shut-off valve
1
Handle
4.7.4.2 Option la
Spark arrestor
Sparks in exhaust fumes represent a considerable risk in environments with flammable materials.
Flying sparks combined with flammable materials may cause fires and explosions.
A spark arrestor on the exhaust silencer is required when operating a diesel engine in a fire hazard
area and in forestry and agricultural applications. In such applications, a spark may ignite flamma‐
ble materials.
The spark arrestor prevents the exhaust silencer emitting any glowing fuel residue.
4 Design and Function
4.7 Options
No.: 9_9570 07 USE
Operator Manual Screw Compressor
M250 SIGMA CONTROL MOBIL
51