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.: 999157 / 10/12/2009
page 20 of 31
Tools:
- Phillips screw driver size 2
- Hex key size 2.5 / 5
- Screw driver Torx TX20
- Flat bladed screw driver
- Face wrench with torque indicator
- Flat pliers
☞
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.
Set of seals
BVC 21 NT ...........................................................................................................
696813
Diaphragm
BVC 21 NT VARIO ....................................................................................................
639786
Valve
BVC 21 NT VARIO.........................................................................................................
2x 637225
Face wrench
with torque indicator ..............................................................................................
637580
Replacing diaphragms and valves
All bearings are encapsulated and are filled with long-life lubricant. Under normal ope
-
rating 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 motor capacitors regularly by measuring their capacity and estimating
their operation time. Exchange old capacitors early enough to prevent a failure. The
capacitors have to be replaced by an electrician.
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 through the pump 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
personnel and environment.
Ensure that maintenance is done only by suitable trained and supervised tech-
nicians.
Ensure that the maintenance technician is familiar with the safety proce-
dures which relate to the products processed by the pumping system.
☞
Before starting maintenance
vent the system. Uncouple the collecting bottle
and remove.
Isolate equipment from mains before removing the cover
!
Wait two minutes to allow the capacitors to discharge.
Allow sufficient cool
-
ing of the pump. Drain condensate, if applicable. Avoid the release of pollutants.
☞
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 de-
fective or damaged pump
.
•
Attention
: The pump might be contaminated with noxious or otherwise danger-
ous 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 oc-
curred.
• Wear appropriate safety-clothing when you come in contact with contaminated
components. Avoid the release of pollutants.
NOTICE
