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Replacing diaphragms and valves
All bearings are encapsulated and are filled with long-life lubricant. Under normal
NOTICE
operating conditions, the pump is maintenance free. The valves and diaphragms as
well as the motor capacitors are wear parts. If the rated ultimate vacuum is no longer
achieved or in case of increased noise level, the pump interior, the diaphragms and
the valves must be cleaned and the diaphragms and valves must be checked for
cracks or other damage. Check every capacitor regularly by measuring its capacity
and estimating its operation time. Exchange old capacitors early enough to prevent
a failure. The capacitors have to be replaced by an electrician. Depending on in-
dividual cases it may be efficient to check and clean the pump heads on a regular
basis. In case of normal wear the lifetime of the diaphragms and valves is > 10000
operating hours.
-
If the pump is exposed to corrosive gases or vapour or in case of deposits, mainte-
nance should be carried out frequently.
-
Ensure that maintenance is done only by suitable trained and supervised tech-
nicians.
☞ Ensure that the pump cannot be operated accidentally. Never operate the pump
☞ Before starting maintenance isolate the pump from the electrical supply and wait
•
•
Before starting maintenance vent the pump and isolate it from the vacuum sys-
NOTICE
tem.
Set of seals for ME 16, MD 8 (diaphragms and valves) ..............................................................696819
Set of seals for MD 12, MV 10 (diaphragms, valves and O-rings) ..............................................696827
16 x O-ring 28 x 1.5 (MD 8 / MD 12 / MV 10) ..............................................................................637090
Diaphragm key (w/f 66) ...............................................................................................................636554
☞ Please read section "Replacing diaphragms and valves" completely before
starting maintenance.
Partially the pictures show pumps in other versions. This doesn't influence replacing diaphragms and
valves of the pump.
Documents are only to be used and distributed completely and unchanged. It is strictly the users' responsibility to check carefully
the validity of this document with respect to his product. Manual-no.: 9997832 / 03/02/2009
page 17 of 26
Prevent internal condensation, transfer of liquids or dust. The diaphragm and
valves will be damaged, if liquids are pumped in significant amount.
Regular maintenance will improve the lifetime of the pump and also protect both
man and environment.
if covers or other parts of the pump are disassembled. Never operate a de-
fective or damaged pump.
two minutes after isolating the equipment from mains to allow the capacitors to
discharge. Avoid the release of pollutants. Allow sufficient cooling of the pump.
Attention: The pump might be contaminated with the process chemicals that have
been pumped during operation. Ensure that the pump is decontaminated before
maintenance and take adequate precautions to protect people from the effects
of dangerous substances if contamination has occurred. Ensure that the mainte-
nance technician is familiar with the safety procedures which relate to the prod-
ucts processed by the pumping system.
Wear appropriate safety-clothing when you come into contact with contaminated
components. Avoid the release of pollutants.
Tools required (metric):
-
Phillips screw driver size 2
-
Open-ended wrench w/f 15 / 17 / 20
-
Hex key size 5
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Diaphragm key w/f 66
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