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Operating Instructions
Vacuum pumps
F
E
F
Pump ranges
These operating instructions concern the following oil flooded rotary vane vacuum pumps:
CLFH 341, CLFH 501, CLFH 631, CLFH 1001 (ultimate vacuum 0.5 mbar abs.)
CLFEH 341, CLFEH 501, CLFEH 631, CLFEH 1001 (ultimate vacuum 10 mbar abs.)
Version (01)
mesh filter (341/501) see picture
Version (02)
micro fine filters
The vacuum capacities at atmosphere are 340, 500, 630 and 1000 m
showing capacity against vacuum can be seen in data sheets D112 (CLFH) and D113 (CLFEH).
Description
CLFH and CLFEH vacuum pumps are fitted as standard with either a mesh filter or a micro fine filter on the pump inlet
depending upon the application. 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.
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. 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.
Optional extras: The following standard optional extras can be supplied if required: Vacuum regulating valve, additional
non return valve, dust inlet filter, high vacuum suction filter, direct on line (DOL) motor starter, star delta starter, unloading
valve for star/delta starting and various vacuum gauges.
Suitability
The units CLFH and CLFEH 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.
These models can be used for the evacuation of a closed system or for a permanent vacuum from:
50 Hz
CLFH: 0.5 to 200 mbar (abs.) • CLFEH: 10 to 400 mbar (abs.)
60 Hz
CLFH: 0.5 to 150 mbar (abs.) • CLFEH: 10 to 400 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.
When handling oxygen, the saftey instruction sheet XE 3 should be 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.
The back pressure on the exhaust port must not exceed + 0.1 bar.
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.
O
F
B
U
A
F
D
1
see picture
3
/hr operating on 50 cycles. The pumping curves
N
M
R
E
E
CLFH
CLFEH
CLFH
341
CLFH
501
CLFH
631
CLFH 1001
CLFEH 341
CLFEH 501
CLFEH 631
CLFEH 1001
BE 112
1.5.2000
Werner Rietschle
GmbH + Co. KG
Postfach 1260
79642 SCHOPFHEIM
GERMANY
0 76 22 / 3 92-0
Fax 0 76 22 / 39 23 00
E-Mail: info@rietschle.com
http://www.rietschle.com
Rietschle (UK) Ltd.
Bellingham Way
NEW HYTHE
KENT ME20 6XS
UNITED KINGDOM
0 16 22 / 71 68 16
Fax 0 16 22 / 71 51 15
E-Mail: info@rietschle.co.uk
http://www.rietschle.co.uk
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