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Conveying System Mechanical Components Chapter 4: Operation 80 of 138
High Vacuum Relief Regulator Operation
A factory-set pressure regulator is installed on the pump package vent valve as a mechanical
back-up safety feature. It protects the pump motor from damage during high vacuum
conditions if an undetected failure of the vacuum switch should occur. The regulator is set to
limit system vacuum to 15” Hg (475 millibars) by allowing the vent valve plunger to shift
and vent the pump. SPC vacuum relief is set at lower levels based on vacuum pump
performance curves.
Note: Do not adjust the pressure regulator. Adjusting the pressure regulator voids
your warranty.
See Figure 36 on page 71 for additional operation information.
4-3 Shut-down
To deactivate the conveying system:
1. Turn the disconnect switch at each pump or component to OFF. This will take each
pump or component offline.
2. Turn off the compressed air supply to the system.
Note: Consult your specific controller operation and instruction manual for specific
shut-down information for your conveying system.