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.

Conveying System Mechanical Components Chapter 4: Operation

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Sterling 882.00379.00 manual Shut-down, High Vacuum Relief Regulator Operation