Lutz-Jesco MEMDOS SMART LD, Руководство по эксплуатации

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Maintenance
Tighten up dosing head bolts
39
© Lutz-Jesco GmbH 2015
Subject to technical changes.
150302 BA-10102-02-V02
Stepper motor-driven diaphragm dosing pump MEMDOS SMART LD Operating Instructions
Maintenance work to be carried
out
Frequency
Check that the installed accesso-
ries are functioning correctly Regularly
Check the dosing pump for unusual
noises during operation, unusual
temperatures or smells Regularly
Replace parts that are subject to
wear (diaphragms, valves, seals,
etc.) When unacceptable levels of
wear are detected
Rinse out and clean the dosing
pump Before changing diaphragms
Before taking out of service for a
long period of time
After feeding aggressive, sticky,
crystallising or contaminated
liquids
Table 31: Maintenance information and maintenance intervals
12.2 Tighten up dosing head bolts
è
Tighten the dosing head bolts in diagonally opposite sequence with a
torque wrench.
The necessary torque is 180 Ncm.
12.3 Change the diaphragm
d
e
c
b
a
Fig. 42: Exploded view of the diaphragm and dosing head
12.3.1 Remove the old diaphragm
Precondition for action:
ü
You have disconnected the dosing pump from the mains supply.
ü
You have depressurised the hydraulic sections of the plant.
ü
You have rinsed the dosing pump using a safe medium (e.g. water).
Perform the following working steps:
1.
Screw out the four screws
e
on the dosing head using a suitable
tool (SW 3 Allen key) and take off the dosing head
d
.
2.
Use pliers to bend the edge of the diaphragm
c
slightly upwards
and screw it out counter-clockwise.
12.3.2 Install a new diaphragm
Precondition for action:
ü
You have thoroughly cleaned the diaphragm rod
b
and the
diaphragm flange
a
so that the new diaphragm is not affected by
dosing medium residues.
ü
You have slightly greased the diaphragm thread
c
(e.g. using
Molykote Longterm W2).
1.
Screw the diaphragm manually
c
in the clockwise direction until it
safely contacts into the diaphragm rod.
2.
Bring the dosing head into position and insert the screws. First
tighten the screws finger-tight. After this, tighten the bolts on the
diagonal, e.g. top left – bottom right – top right – bottom left.
NOTICE
Damage to the dosing head/diaphragm leaks
If you tighten the screws too much, this can lead to the dosing head
being damaged. However, not tightening the screws enough leads to
the diaphragm being leaky and correct functioning being affected.
ð
Tighten the screws to a torque of 180 Ncm.
ü
Diaphragm change finished.
i It may be necessary to gauge the delivery capacity after
replacing the diaphragm or other dosing pump spare parts.
12.4 Clean suction and discharge valves
Contaminated valves affect the dosing preceision and this means that
you should clean the valves on a regular basis.
With dosing heads made of plastic, when replacing a valve you must
replace the complete dosing head (see chapter 14 „Ersatzteile“ auf Seite
43).