Heidolph ROTAVAC Vario pumping unit - Manual (Page 50)

page 50 of 61
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.: 999248 / 28/04/2011
Set of seals ROTAVAC vario Pumping unit ..................................................................... 11-300-00-40
(4 diaphragms, 8 valves, diaphragm key)
Valve ................................................................................................................................23-30-01-01-91
Diaphragm .......................................................................................................................23-30-01-01-92
Diaphragm key ................................................................................................................02-07-02-01-13
11 Replacing diaphragms and valves
☞ Before starting maintenance isolate the pump from the electrical supply and
wait two minutes after isolating the equipment from mains to allow the capaci-
tors to discharge. 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 de-
fective or damaged 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
maintenance technician is familiar with the safety procedures which relate to the
products processed by the pumping system.
• Wear appropriate safety-clothing when you come into contact with contaminated
components. Avoid the release of pollutants.
Before starting maintenance vent the pump and isolate it from the vacuum system
and the electrical supply. Drain condensate if applicable, avoid the release of pollut-
ants. Allow sufficient cooling of the pump. Separate pump from cooling water circuit
(if applicable).
All bearings are encapsulated and are filled with long-life lubricant. Under normal
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.
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 vapor 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
man and environment.
Ensure that maintenance is done only by suitable trained and supervised techni-
cians.
order no.
NOTICE
NOTICE The pump may contain black and white colored valves. In case of maintenance
replace all valves by the black valves enclosed in the set of seals.