Grundfos DMH 25X Installatie- En Bedieningsinstructies pagina 34
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Zie ook voor DMH 25X:
- Installatie- en bedieningsinstructies (52 pagina's) ,
- Installatie- en bedieningsinstructies (10 pagina's) ,
- Installatie- en bedieningsinstructies (14 pagina's)
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Beschikbare talen
Beschikbare talen
Suction side
1)
Fig. 34 DN 32 valve, suction side and discharge side
The O-rings must be correctly placed in the specified
groove.
Caution
Observe the flow direction (indicated by an arrow on
the valve)!
Only tighten plastic valves by hand.
10.6 Replacing the diaphragm and gear oil for dosing
head with single diaphragm (no diaphragm
leakage detection)
Warning
Wear protective clothing (gloves and goggles) when
working on the dosing head, connections or lines!
The dosing diaphragm should be replaced with each
gear oil change.
Before removing the dosing head, valves and lines,
empty any remaining medium in the dosing head into
a drip tray by carefully unscrewing the suction valve.
Only use original Grundfos gear oil!
Note
For product numbers, see "Service kit catalogue" on
www.grundfos.com
Pump model
Version
DMH 251
Single/double
DMH 252, 10 bar
Single/double
DMH 252, 16 bar
Single/double
DMH 253
Single/double
DMH 254
Single
DMH 254
Double
DMH 255
Single
DMH 255
Double
DMH 257
Single
DMH 257
Double
Collect the gear oil in a container and dispose of it
Note
correctly.
34
Discharge side
2)
Description
1.3 l white oil
(Paraffin 55 DAB7)
1.3 l white oil
(Paraffin 55 DAB7)
1.3 l DHG 68
1.3 l DHG 68
3.5 l DHG 68
4.5 l DHG 68
3.5 l DHG 68
4.5 l DHG 68
5.5 l DHG 68
7.5 l DHG 68
10.6.1 Drain gear oil
Fig. 35 Drain gear oil
Pos.
Components
B
Locking screw
1b
Gasket
F
Oil-filling screw with dipstick
L
Stroke-length adjustment knob
1. Unscrew the locking screw (B) and collect the gear oil in a
container.
2. Screw the locking screw (B) and the new gasket (1b) back in
and tighten securely.
Risk of leaking oil and damage caused by oil loss!
Caution
For each oil change, a new flat gasket (1b) must be
fitted!
10.6.2 Removing the dosing head
1. Close the suction and discharge lines and loosen the suction
and discharge valve connections.
2. Loosen the six dosing head screws (1q with 2q).
3. Remove the dosing head (2).
10.6.3 Replacing a single diaphragm (no diaphragm leakage
detection)
•
Remove the diaphragm and fit a new diaphragm (Q) on the
suction side. See fig. 36.
2q
1q
2
Fig. 36 Replacing a single diaphragm
Pos.
Components
1q
Dosing head screw
2q
Intermediate disk
2
Dosing head
Q
Diaphragm
F
L
1b
B
Q
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