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9.4 Circuit diagrams
9.4.1 Examples of Vacuum Pump circuit diagrams
Figure 11. Connection with top mounted liquid separator
The flange connection should be linked to the discharge pipe, specifically for the separated operating Liquid (D30),
using the line designated for partial draining (A21).
To enable partial draining effectively, it is necessary to incorporate automatically actuated shut-off fittings (A41).
These fittings serve the following purposes: It remains open when the machine is at a standstill, close during machine
operation, immediately after it is switched on, as this prevents continuous leakage of liquid and gas during the
operational phase.
A20Vacuum pump/compressor
A21 Line for partial draining
A27 Plug for complete draining
A28 Plug for connection of
pressure
gauges
A41Shut-off
fitting
ensuring
partial draining)
B30 Liquid separator
(assembled)
C10 Inlet pipe
C11 Shut-off fitting
NBE O & M Document No. NES/NBE/O&M
C12 Non-return fitting
C13 Pressure gauge
C16 Y-pipe
C30 Discharge pipe (gas)
D10 Feed pipe for operating
Liquid
D11 Shut-off fitting
(for
D13 Pressure gauge
D14 Volume flow meter
D30
Discharge
separated
operating Liquid
D50 Discharge pipe for draining
and flushing
D51 Shut-off fitting
D56 Funnel or sight glass
E10 Feed pipe for sealing Liquid
(only for design with external
sealant supply)
E11 Shut-off fitting
E13 Pressure gauge
E14 Volume flow meter
pipe
for
E30 Discharge pipe for seepage
liquid of shaft seal
Page 37 of 43
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