Grundfos DDI 209, Инструкция по установке и эксплуатации

Страница: 67 / 76

English (GB)
67
10. Maintenance
10.1 General notes
10.2 Maintenance intervals
• At least every 12 months or after 4,000 operating
hours. When dosing crystallising liquids, more
frequently.
• In the event of a fault.
10.2.1 Cleaning the valves and diaphragm
• Clean the diaphragm and valves and replace, if
necessary (for stainless-steel valves: inner valve
parts).
10.3 Cleaning suction and discharge
valves
10.3.1 Switching off the pump
1. Switch off the pump and disconnect it from the
power supply.
2. Depressurise the system.
3. Take suitable steps to ensure that the returning
dosing medium is safely collected.
10.3.2 Unscrewing the priming chamber valve
(Plus
3
system)
When using the Plus
3
system, unscrew the priming
chamber valve (3c) as follows:
1. Remove the cover (L) from the priming chamber.
2. Remove the valve tube (R) with the valve (3c).
3. Unscrew the valve (3c) from the valve tube.
Fig. 68 Priming chamber valve
10.3.3 Unscrewing suction and discharge
valves/cleaning valves
1. Unscrew the suction and discharge valves.
2. Dismantle the inner valve parts:
•
Standard DN 4/DN 8 valve:
– Carefully push out the inner valve part using a
thin wire nail (or paper clip) in the flow
direction (see arrow on the valve body).
– Dismantle the inner parts: seat (4r), O-ring (1r),
balls (3r), ball cages (2r).
Fig. 69 Standard DN 4/DN 8 valve
Warning
When dosing dangerous media,
observe the corresponding safety
precautions!
Risk of chemical burns!
Wear protective clothing (gloves and
goggles) when working on the dosing
head, connections or lines!
Do not allow any chemicals to leak
from the pump. Collect and dispose of
all chemicals correctly!
Warning
The pump housing must only be
opened by personnel authorised by
Grundfos!
Repairs must only be carried out by
authorised and qualified personnel!
Switch off the pump and disconnect it
from the power supply before carrying
out maintenance work and repairs!
Caution
In the event of a diaphragm leakage,
the dosing liquid may leak out of the
hole in the intermediate flange between
the pump and the dosing head.
The parts inside the housing are
protected from the dosing liquid for a
short time (depending on the type of
liquid) by the housing sealing. It is
necessary to check regularly (daily) if
liquid is leaking out of the intermediate
flange.
For maximum safety, we recommend
the pump version with diaphragm
leakage detection.
Note
If possible, rinse the dosing head,
e.g. by supplying it with water.
TM
03
6
264
45
06
TM
0
3
6
265
4
506
F
R
L
3c
0
2
4
1r
2r
3r
4r
3
2r
3r
4r