18
Operation
Gas ballast valve with
solenoid valve
The inlet of gas ballast or flushing gas can be controlled by a solenoid valve if a conver-
sion kit is used.
If the process does not require flushing, ambient air can also be admitted via the solenoid
valve. For this, remove the hose connection and attach the gas ballast filter 122 to the
solenoid valve.
Fig. 11: Assembling the solenoid valve at the gas ballast inlet
Remove gas ballast filter 122.
Unscrew connection 154, take care to ensure the flat gasket is secure.
Seal the external thread G 1/2" of screw connection part I and attach to ball valve 120.
Mount the screw connection part II so that the solenoid valve is facing up; take care
to ensure the flat gasket is secure.
Make electrical connections 24 V DC.
Attach flushing gas to hose connection (NW 12… 14 mm) or after removing the hose
nozzle attach to the internal thread G 1/2".
Set flushing gas pressure; maximum pressure 1500 hPa (absolute).
– Select the type and amount of flushing gas depending on the process; consult Pfei-
ffer Vacuum if necessary.
Dose flushing gas with the knob on the ball valve 120 or with a flow meter on site.
NOTICE
Flushing gas pressure higher than allowed endangers the operational reliability
of the pump.
The power input of the pump, the temperature and the ejection of operating fluid will in-
crease.
Observe the maximum permissible flushing gas pressure.
Set the amount of flushing gas on site.
Supply voltage:
24 V AC/DC
Starting power:
80 W
Stopping power:
6 W
Valve closed without current
122
120
154
“I“
“II“
