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K
K
1
I
H
Y
E
R
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Q
Q
F
E
F
A
F
O
O
U
M
N
K
K
1
I
H
Y
Q
R
Q
Q
O
O
M
E
F
F
A
F
E
N
B
U
B
Pump ranges
These operating instructions concern the following oil lubricated rotary
vane vacuum pumps: VCH 100 /140 (picture
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) and VCH 180 / 250
(picture
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)
Description
The VCH 100 / 140 has a connection flange and VCH 180 /250 a threaded
connection on the pump inlet. On the exhaust side of the VCH an oil mist
eliminator is fitted which has the function of re-circulating oil back into the
circulation system. Situated between the pump housing and the motor,
a high efficiency cooling fan pulls air in through the oil cooler (R), over the
double walled cylinder and out through the fan cover, which also provides
protection from accidentally touching the fan when the pump is in
operation.
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. Exces-
sive 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.
All the pumps are driven by a 3 phase motor via a pin and bush coupling.
Suitability
The units are suitable for the use in the industrial field i.e. the
protection equipments corresponds to EN DIN 294 table 4, for
people aged 14 and above.
The VCH was developed specially for use with vacuum packing ma-
chines, where a specific chamber volume is to be periodically evacuated.
The model can however also be used for the evacuation of a closed
system or for a permanent vacuum from:
50 Hz
➝
0.5 to 200 mbar (abs.)
60 Hz
➝
0.5 to 150 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 handled. Water, other liquids, aggressive or inflammable gases and vapours may not be handled.
For water vapour tolerance, see information I 200.
Handling of inflammable or aggressive gases and vapours is only possible with special versions, if the safety instructions XE 2 are noted.
The ambient and suction temperatures must be between 5 and 40°C. For temperatures outside this range please contact your
supplier.
The standard versions may not be used in hazardous areas. Special
versions with Ex-proof motors can be supplied.
For all applications where an unplanned shut down of the
vacuum pump could possibly cause harm to persons or
installations, then the corresponding safety backup system must
be installed.
Handling and Setting up (pictures
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to
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)
Pumps that have reached operating temperature may have a
surface temperature at position (Q) of more than 70°C.
WARNING! Do Not Touch.
Oil filler port (H), oil sight glass (I), oil drain plug (K, K
1
), gas ballast
valve (U), connection cover (D) and oil separator cover (Y) must all be
easily accessible. The cooling air entries (E) and the cooling air exits (F)
must have a minimum distance of 20 cm from any obstruction. The
discharged cooling air must not be re-circulated. For maintenance
purposes we recommend a space of 0.25 m in front of the connection
cover (D) and oil separator cover (Y).
The VCH pumps can only be operated reliably if they are installed
horizontally.
For installations that are higher than 1000 m above sea level
there will be a loss in capacity. For further advice please
contact your supplier.
Installation (pictures
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and
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)
For operating and installation follow any relevant national
standards that are in operation.
1. Vacuum connection at (A)
The air handled can be exhausted into the atmosphere through the
exhaust port (B) or by utilising an exhaust pipe.
Long and/or small bore pipework should be avoided as this
tends to reduce the capacity of the pump.
The exhaust port (B) must not be obstructed or partly obscured.
2. The lubricating oil (recommended brands see under servicing) can be
put into the pump at the oil filler port (H) of the oil separator housing,
until the oil level shows at the upper mark of the oil sight glass (l). After
filling make sure oil filler port is closed.
