ISTRUZIONI ORIGINALI
TECHNICAL INFORMATION
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87-900-136-01
SECTION I
TECHNICAL DESCRIPTION
The pumps series MS (MS-301 and MS-631) are
single stage rotary vane vacuum pumps lubri-
cated, with oil recirculation, driven by a flanged
electrical motor, coupled by means of an elastic
coupling.
MS-301
MS-631
These Varian vacuum pumps are suitable for
pumping non corrosive gases.
The pumps series MS can reach:
−
≤
8 x 10
-2
mbar (partial pressure) without gas
ballast valve
−
≤
0.7 mbar (ultimate total pressure) with gas
ballast valve.
Cooling is achieved by means of an air/oil cooler,
cooled with a centrifugal fan. At the pump inlet
there is a mesh filter in order to protect it from solid
parts having diameter larger than 1.5 mm. Fur-
thermore, an integrated non return valve prevents
the oil coming back and the return of air in the
chamber to be pumped down during the stop
phase.
In the tank there is a system of oil smokes separa-
tion from the discharged air (maximum residual
2PPM/weight corresponding to 2.4 mg/m
3
).
The separated oil is recovered automatically by the
pump.
A standard gas ballast valve prevents condensa-
tion inside the pump even when pumping down
small quantity of vapour.
Here after are shown symbols used to identify the
threaded ports;
−
This symbol identifies the inlet port
−
This symbol identifies the exhaust threaded
port.
