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During initial operation, verify that the purge
process is operating satisfactorily (see Figure
3A.7):
1. The electric isolation valve closes and isolates
the vacuum pump from the process stream.
2. The purge solenoid valve opens and allows
fresh air to enter the pump. Make sure that
the manual adjustable purge valve on the
inlet side of the purge solenoid valve is used
to set the rate of air that passes through the
purge system during a purge cycle. Set the
manual adjustable purge valve to a point
where the pump achieves a vacuum level of
approximately 20" Hg or more on the gauge
located at the pump inlet during the purge
cycle.
Purge Solenoid
Valve
Manual
Adjustable
Purge Valve
Lubricated Rotary Vane Laboratory Vacuum Systems
Vacuum Gauge
Figure 3A.7 Purge Assembly Components
3A-5
Electric Actuator
Isolation Valve
4107 9021 88.01
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