Installation
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300855170_002_C4 - 06/2020 - © Leybold
3.7 Connect a power failure venting valve or a venting valve
The power failure venting valve (normally open) or venting valve (normally
closed) 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.
The max. permissible pressure in the pump must not exceed 1.4 bar (abs.).
Unscrew and remove the locking screw and the gasket from the venting con-
nection of the TURBOVAC.
Screw in the venting valve and the gasket into the venting connection. To
protect the threads, the max. fastening torque is 5 Nm.
If applicable connect the venting gas supply at the valve’s inlet (G1/8“).
When using the pump with purge gas, protect the purge gas supply such
that in the event of a malfunction no overpressure can occur within the
system. The pressure in the pump must not exceed 1400 mbar (0.4 bar
over pressure).
Connect a purge gas or venting valve to the correct flange. Confusing the
venting and purge gas flange can cause shock venting of the pump.
Plug in the corresponding control cable into the accessories connection.
For the electronic drive unit change the venting valve settings to venting
operation (via the interfaces).
CAUTION
NOTICE
Fig. 3.8 Venting and purge gas connections
VENT
Venting connection
G 1/8“
PURGE
Purge gas connection
G 1/8“