VWR Rotary Vane Pump ver 1.3 23.11.2020
9.60 Gas Ballast Control
The principle of the gas ballast is described in chapter 8.32 Gas ballast. To open or close the gas ballast
turn the gas ballast switch to the position open or close.
Operation with gas ballast when drawing off condensable vapours
We suggest operation with the gas ballast valve open, provided that the composition of gas in the vacuum
pump to be drawn off is not known and cannot be ruled out. If condensable gas and vapours are to be
delivered, the latter or their condensates will mix with the oil. As a result of this, the pump performance will
degrade.
9.70 Closing down
A few simple precautions are necessary before performing a pump shutdown.
- If a gauge is connected to the system, first isolate the gauge, then turn off the power to the pump
and open the system to the atmosphere.
- If condensable media have been pumped, the vacuum pump must be run after pumping with the gas
ballast valve open and the intake pipe closed.
- If the vacuum pump is not going to be used for a sometime after pumping aggressive or corrosive
media, or if it not going to be used for a long time, then proceed as follows:
o If the pump oil is contaminated and the pump is going to be stored for a prolonged period, the oil
should be changed before the pump is stored. Even if a pump is stored for a long period with oil
initially in good condition, check the oil when the pump is restarted, and change the oil if
necessary.
o Close connecting ports with a rubber stopper or other suitable cover to protect the pump against
contamination. An intake screen is furnished to prevent loose particles from entering.
To Next Page
Loading...
