can result in possible serious injury from flying parts and a very loud noise that can
damage your hearing.
When the shutoff valve is in the on position, the compressed air supply
pressurizes the pneumatic system.
Figure 33: Shutoff valve in the on position
As you turn the shutoff valve to the off position, you hear a hissing
sound, which indicates that high-pressure air currently in the filter
elements and bowl is being drained out of the system. When the
shutoff valve is fully in the off position, the compressed air supply is
blocked, and it is safe to inspect or to change a filter.
Figure 34: Shutoff valve in the off position
You can secure the valve in the off position with a padlock when you
perform a task that requires a lockout procedure.
30
Chapter 4—Safety features
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