VACUUBRAND BVC 21 - Manual (Page 18)

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.: 999054 / 15/12/2009
page 18 of 27
Tools:
- Phillips screw driver size 2
- Open-ended wrench w/f 17
- Hex key size 5
- Face wrench with torque indicator
Diaphragm ................................................................................................................................. 63 97 86
Valve .......................................................................................................................................... 63 88 36
Face wrench with torque indicator .............................................................................................. 63 75 80
Replacing diaphragms and valves
All bearings are encapsulated and are filled with long-life lubricant. Under normal oper-
ating conditions, the pump is maintenance free. The valves and the diaphragms 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.
Depending on individual 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.
☞ Prevent internal condensation, transfer of liquids or dust. The diaphragm and valves
will be damaged, if liquids are pumped in significant amount.
If the pump is exposed to corrosive gases or vapour or in case of deposits, mainte-
nance should be carried out frequently.
☞ Regular maintenance will improve the lifetime of the pump and also protect both
personel and environment.
Before starting maintenance vent the system, isolate the pump and other compo-
nents from the vacuum system and the electrical supply. Drain condensate if applica-
ble, avoid the release of pollutants. Allow sufficient cooling of the pump. Ensure that
the pump cannot be operated accidentally. Never operate the pump if covers or
other parts of the pump are disassembled. Never operate a defective or damaged
pump.
Ensure that the maintenance technician is familiar with the safety procedures which
relate to the products processed by the pumping system.
Attention: The pump might be contaminated with the process chemicals that have
been pumped during operation. Ensure that the pump is decontaminated before main-
tenance and take adequate precautions to protect people from the effects of danger-
ous substances if contamination has occurred.
☞ Wear appropriate safety-clothing when coming in contact with contaminated com-
ponents.
☞ ☞ ☞ ☞ ☞ Please read section ”Replacing diaphragms and valves” completely before start-
ing maintenance.
Partially the pictures show pumps in other versions. This doesn’t influence replacing diaphragms and
valves of the pump.