Installation
34
300324726_002_C0 - 10/2016 - © Leybold
Sperrgas- und
Belüftungsventil
G
1
/
4
"
Übergangs-Zentrierring
DN 10/16 KF
DN 10 KF
Anschluss Gasseite
PURGE/VENT
Fig. 3.10 Connect purge gas and venting valve
Purge gas
3.6 Connect the purge gas and venting valve
The pumps are equipped with a purge gas facility. A purge gas and venting
valve or a power failure venting valve or a venting valve may be connected
directly using a DN 16 KF centering ring.
The power failure venting valve or venting valve vents the pump and the fore-
vacuum line when the pump is switched off and thus keeps oil vapor from
diffusing back from the forevacuum line.
A choke nozzle in the vent port ensures that the pump is not vented too fast.
When having to decide which gases need or not need to be pumped with
purge gas we are available to provide assistance.
Refer to Section 4.1 for suited gases.
When operating the pump with purge gas, the pump needs to be vented via
the purge gas valve after having shut down the pump, see Section 4.6.
Consider the additional purge gas flow when selecting a suitable backing
pump.
We recommend a purge gas flow of 0.6 mbar·l/s (36 sccm) with Nitrogen.
The pressure in the pump must not exceed 1400 mbar (0.4 bar over-
pressure). Observe Safety Informations 0.1.2 to 0.1.5.
Connect the purge gas and the venting valve recommended by us according
to its instructions. The valve cables can be connected directly at the pump.
When doing so, do not confuse “Purge” and “Vent”!
WARNING
