For the operation in fire hazard areas, the machine is equipped with the following accessories:
■ Engine air shut-off valve
■ Spark arrestor
4.8.3.1 Option lb
Engine air shut-off valve
If flammable gases and vapors are drawn by the Diesel engine from the environment into the air
intake, they will act like catalytic converters. This causes a sudden and uncontrolled increase in en‐
gine speed that can result in serious mechanical damage. Without appropriate preventive meas‐
ures, the engine and 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.
Fig. 15 Engine air shut-off valve
1
Engine air shut-off valve
Manually 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.
4
Design and Function
4.8
Options
48
Operator Manual Screw Compressor
M114 SIGMA CONTROL SMART
No.: 901765 05 USE
Option lb
