Changing The Injection Seals - dosatron D8R Gebrauchsanweisung

CHANGING SEALS IN THE INJECTION ASSEMBLY - cont...
CLEANING AND RE-ASSEMBLING THE SUCTION VALVE SEAL
- Turn off the water supply and allow the pressure to drop to zero.
Model D8R
- Unscrew the nut (Fig. 20/21-E) and pull downwards to remove the suction
tube.
- For the suction tube Ø 20 (D8RV and D8R150), loose the clamp on the suc-
tion hose with a screwdriver (Fig. 21-C).
- Unscrew and remove the black nut (Fig. 20/21-N).
- Pull downwards to remove the suction valve assembly.
- Thoroughly rinse all single parts with water, reassemble according to the
drawing (Fig.20/21-P) and check that the suction valve spring is in correct
operating condition.
- Re-assemble in the reverse order to the above by hand.
E
N
P
Fig. 20
Model D8R150
- Unscrew the blocking ring (Fig. 22-A).
- Pull downwards to remove the suc-
tion valve assembly
- Thoroughly rinse all single parts
with water, reassemble according to
the drawing (Fig.22-P) and check
that the suction valve spring is in cor-
rect operating condition.
- Re-assemble in the reverse order to
the above by hand.
© DOSATRON INTERNATIONAL / 48
E
N
C
P
Fig. 21
A
Fig. 22
P
CHANGING SEALS IN THE INJECTION ASSEMBLY - cont...

CHANGING THE INJECTION SEALS

- Turn off the water supply and allow the pressure to drop to zero.
- Take off the suction hose, unscrew the injection part as described in the
previous chapter and pull downwards to remove it.
- Change the injection stem seal (Fig. 23-O) and the plunger seal (Fig. 23-P).
- For the D8R, unscrew the suction valve maintaining nut (Fig. 23-E), taking
care not to loose the single parts of the suction valve, then change the o-
ring (Fig. 23-T) and the valve seal (Fig. 23-C).
- For the D8R150, while holding the nut (Fig. 23-S), unscrew the sleeve (Fig.
23-U) and pull downwards.
- Re-assemble in the reverse order to the above.
Note : The graduated scale (Fig. 23-L) must be in front of you.
- Fasten the fixing ring (Fig. 23-R) firmly.
D8R D8R150
P
Push the injec-
tion assembly
O
as far as it will
L
go. Turn slightly
R
to the left or to
the night until
the dosing stem
gets blocked.
C
T
E
option V
option V
Fig. 23
© DOSATRON INTERNATIONAL / 49
S
P
O
U