Installation
45
300314330_002_C7 - 05/2021 - © Leybold
3.5.2 Guidelines for Purge Gas Operation, Settings and Monitoring
Possible purge gases are N2 and CDA only.
The safety always has to be considered (please be careful with air purges
and read the safety booklet of Leybold).
Exhaust shaft seal purge is running in most of all applications all the time.
Fig. 3.9 Purge gas and switches schematic
LI
320
PSH
200
T
intern
CV
-80
PRV140
PRV141
L1 L2 L3
Pt 1000
TSH
280
TSH
281
SV
42
SV
41
SV
40
PSL
220
Process
IN
Out
LI
321
SV
43
PI
181
PI
180
SV
44
Cooling Water
in
out
400 V
SRV
100
N2
4 - 8 barg
CV
-82
CV
-81
1)
T
TSH
285
No Description
TSH Temperature Switch High
281 Frequency Conv. Intern
TSH Temperature Switch High
280 Pt 1000 Gear Flange
TSH Temperature Switch High
285 Temperature limiter
Frequency conv. housing
(Motor
terminal box ( -r))
PSH Pressure Switch High
200 Exh. Pressure 0.25 bar(g)
LI
Level Indicator
320 Oil Motor Bearing
321 Oil Gear Side
PSL Pressure Switch Low
220 Purge 2.4 bar(g)
SV Solenoid Valve
40 Exhaust seal purge
41 Rotor purge2)
42 Inlet seal purge2)
43 Optional purge
44 Optional flushing
PI
Pressure indicator
180 Water
181 Nitrogen
PRV Pressure Regulator (Filter)
SRV Safety relief valve 8 bar(g)
CV Check valve
1) At pumps with single purge gas module check valves CV-81 and CV-82
and the corresponding throttles are missing, the lines are blanked off
2) Opening of these valves will impair the ultimate pressure; see Technical Data.
DRYVAC DV 650
NOTICE
