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VCE
2. Operating Instructions
➝
➝
➝
➝
➝
Vacuum pumps VCE and VCEH
2.1 Pump ranges
These operating instructions concern the follow-
ing oil flooded rotary vane vacuum pumps:
VCE 15, VCE 25, VCE 40, VCE 60, VCE 100
VCEH 100, VCEH 160, VCEH 250
➝
(ultimate vacuum 10 mbar, abs.)
The vacuum capacities at atmosphere are 15,
25, 40, 60, 100, 160 and 250 m
3
/hr on 50 cycles.
The pumping curves showing capacity against
vacuum can be seen in data sheets D 154 (VCE)
and D 194 (VCEH).
2.2. Description
VCE and VCEH vacuum pumps are fitted with a
mesh filter on the pump inlet. On the exhaust side
of the pump an oil mist eliminator is fitted which
has the function of re-circulating oil back into the
circulation system, as well as providing high
efficiency separation on the pump exhaust. Situ-
ated between the pump housing and the motor, a
high efficiency cooling fan pulls cooling air in through the fan cover. A further fan (VCEH) inside of the oil cooler (R) results in the
cooling of the re-circulating oil. In addition the fan housing and oil cooler provide protection from accidentally touching either fan
when the pump is operating.
A standard built-in non return valve on the inlet of the pump seals the pump from the process when the pump is stopped. This
prevents oil moving into the pumping cylinder when the pump is stationary. Excessive oil in the cylinder could cause an hydraulic
lock when the pump is started and hence undue stress on the rotor blades.
The gas ballast valve (U) which is fitted as standard avoids any condensation of a small amount of water vapour inside the pump
and hence emulsification of the oil. The gas ballast vapour handling capacity can be increased if required to tolerate higher vapour
loads than normal.
All the pumps are driven by a direct flanged three
phase, standard TEFV motor via a pin and bush
coupling.
2.3 Suitability
These models can be used for the evacuation of
a closed system or for a permanent vacuum from:
50 Hz
➝
10 to 500 mbar (abs.)
When these pumps are operated permanently
outside the ranges listed above, there may be oil
seepage at the exhaust port. If closed systems
are evacuated from atmospheric pressure down
to a suction pressure close to the ultimate vacuum
there will be no problem with the oil system,
provided the vacuum limit is achieved within a 10
minute pump down time.
Amounts of water vapour may be han-
dled. Water, other liquids, aggressive or
inflammable gases and vapours may not be
handled. For water vapour tolerance, see in-
formation I 200.
The ambient and suction temperatures
must be between 5 and 40°C. For tem-
peratures outside this range please contact
your supplier.
The standard versions may not be used in haz-
ardous areas. Special versions with Ex-proof
motors can be supplied.
The back pressure on the exhaust port must
not 0.1 bar.
All applications where an unplanned shut
down of the vacuum pump could possi-
bly cause harm to persons or installations,
then the corresponding safety backup system
must be installed.
