How to use the gas ballast valve safety?
May 08, 2026| Ensure that when the gas ballast valve is open, the air/gas that enters through the gas ballast valve doesn't come in contact with any hazardous,explosive or otherwise dangerous mixtures that the vacuum pump is pumping at its inlet.
Venting the receptacles or the vacuum pump using ambient air may under some circumstances create a risk of serious damage to the equipment and/or surrounding installations and a risk to personnel of serious injury or even death, due to the formation of hazardous and/or explosive mixtures if a
reaction between the air and the medium that is being pumped occurs either within the pump or at its outlet.
For pumping condensable vapours (water vapour,solvents, etc.):
1.Let pump run with gas ballast valve closed until pump reaches its operating temperature.
2.Open gas ballast valve.
3.Gas ballast valve is open when the notch on the cap is aligned with the notch on the nozzle (Gas ballast valve can be closed by rotating cap at least
90°).
4.When gas ballast valve is opened, ultimate vacuum will be reduced and pumping speed will decrease.
5.Use inert gas at air inlet to avoid formation of explosive mixtures.
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