Description
10
AirXpress One/AirXpress 2 Fire
GB
Reducer
2.4.
Fig. 8
Reducer
1 High pressure hose
5 Cylinder connector
2 Medium pressure hose
6 Safety pressure valve
3 O-ring
7 Alarm
whistle
4 Hand
wheel
WARNING
Once the air releasing phenomenon by the safety pressure release valve of the reducer is noticed, withdraw
from the working place immediately and stop using this breathing apparatus. Send it to MSA authorized service
centers for inspection and repair. It can only be used after all trouble removed. It’s forbid to adjust any parts in
the reducer by user. The breathing apparatus must be sent back to MSA authorized service centers for repair if
any failure occurs. It is no allowed to disassemble the reducer by the user. Don’t damage the seal surface
when replacing the seal O ring on the high pressure connection.
The reducer is mounted in the lower area of the back plate. It reduces pressure of the high pressure air from the cylinder
to mid pressure at about 7 bar. The air is delivered through medium pressure hose to demand valve, reduce the pressure
again and then used by the user. Turn the hand wheel and connect the cylinder connector with the cylinder. Once the
cylinder valve is opened, the user can view the pressure indication from the pressure gauge as which is connected to the
high pressure hose. A pressure alarm device is equipped in the reducer. When the pressure of the cylinder is lowered to
55 ± 5 bar, it will give off audible alarm signal
≥
90 dB. The alarm device will not be dependent on the ambient air when
alarm device give an alarm, so the alarm device will not lose its function even if in high humid atmosphere or under
sprinkle water, or even in very low temperature. In addition, the air consumed for the alarm device’s alarm is
≤
5 L/min.
There is also a safety release valve, which is set to about 11 bar, in case there is anything wrong and the medium
pressure rises, the valve will opened, release the over pressure to guarantee the performance of the demand valve.
1
3
7
2
6
4
5
