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Technical Information
Vacuum Seals
The pump is equipped with a special anti-suckback device which
automatically isolates the vacuum system when the pump stops. This
avoids rises in pressure or oil flow in the vacuum system while air is
allowed back into the stator chambers.
The air entering the pump after the anti-suckback device has closed
prevents the oil in the casing from filling the stator chambers.
Vacuum Seals
A special feature of this pump is the low number of gaskets that are
employed.
The seals in the circuit are obtained by means of VITON gaskets.
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 vessel
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:
52/90
MS40+ Single Stage Rotary Vane Pumps User Manual / 87-901-008-01
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 degas-sing is
therefore required.
(E)
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