Anti-Suckback Device - Agilent Technologies MS40-S Manual Del Usuario

Technical Information
Sealing of the rotor shaft is guaranteed by a rotating gasket with dust-guard lip.
The suction flange and duct are sealed by mean of OR gaskets.

Anti-Suckback Device

The pump is equipped with a special anti-suckback device to avoid air pressure
rises and/or oil back-flow towards the evacuated chamber when the pump is
switched off. This device has a shutter which automatically closes the suction duct.
In this way the pump and vacuum system are completely isolated from each other
and air can enter the pump without any risk for the vacuum produced in the system.
The device includes some special features, namely:

198
drive obtained avoiding any form of contamination of the inlet duct by fluids (oil
and/or air). Thanks to this, when the pump is started again, the pumpdown to
vacuum conditions is extremely fast as these contaminants are not present
and no degassing is therefore required.
MS40-S User Manual