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300267596_002_C0 - 11/2016 - © Leybold
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Description
Sogevac
®
pumps are designed for pumping of inert gases in the range of
rough vacuum, between atmospheric pressure and ultimate pressure of the
pump.
When removing condensable vapours, a gas ballast valve must be installed.
1.1 Principle of operation
The Sogevac
®
pumps SV40 B, SV65 B and SV100 B are single-stage oil-
sealed rotary vane vacuum pumps.
The rotor, having three slots in which the vanes are sliding, is eccentrically
installed in a pump cylinder (stator).
The vanes separate the interior space into 3 chambers. The volume of these
chambers varies with the rotation of the rotor.
The gas sucked into the inlet chamber is compressed and then pushed out
at the exhaust valve.
The oil injected in the inlet chamber guarantees the air-tightness, the
lubrication and cooling of the pump. It is dragged off by the compressed
gases and roughly separated by gravity when entering in the oil sump. A
fine separation is then operated in the exhaust filter, which retains > 99,9
% of the oil aerosols. An internal transfer pushes the collected oil back into
the vacuum generator, the transfer is operated by a float valve to avoid
atmospheric air coming from the oil casing to the inlet of the pump when no
oil is present in the recovery system.
The oil circulation functions by differential pressures. Some pumps are
equipped with an oil filter.
Pumps are available with or without gasballast, with corresponding catalog
numbers.
At pump switch off, an anti suck-back valve (ASBV) closes the pump inlet
and avoids pump oil be sucked into the chamber.
For this, the ASBV must be kept clean and in good condition.
Description