14
12.6 Mounting the ST7 double mechanical seal (fig. 23)
❑
Set up the shaft in the vertical position with the rotor on the bench.
❑
Slip on the rear cover (09).
❑
Clean the shaft thoroughly.
❑
Slip on the rotating part of the mechanical seal (66.1) with the seat facing away
from the rotor. Take care not to damage the internal gasket during this operation.
❑
Lock the grub screws after positioning the seal as shown in the table below.
NB: The table shows the diameter D of the shaft and the distance L1 between
the seal (66.1) and the rear cover (09) when the latter is not fixed in place but
only resting on the rear of the rotor (fig. 24).
❑
Mount the stationary seat carefully in the seal box (77).
❑
Mount the seal box on the rear cover and repeat the preceeding operations with
the second seal (66.2) and seal box (81).
❑
Mount the pedestal and fix the rear cover temporarily to the pedestal. Screw on
the shaft lock nut with its lock washer.
❑
Mount the outer bearing lock ring (14) and tighten the seal box screws.
❑
Mount the casing and cover and adjust the rotor position as described in paragraph
10.4.
Attention: The cover (04) must be mounted correctly. The idler pin (06) must be
positioned symmetrically between the two ports in the shorter path between the
ports.
❑
Block the security dowels (45) of the lock rings (14,15) ( models V25-2 and V30-2
do not have security dowels).
12.7 Mounting the ST8 double mechanical seal (fig. 25)
❑
Set up the shaft in the vertical position with the rotor on the bench.
❑
Slip on the rear cover (09).
❑
Clean the shaft thoroughly.
❑
Mount the seal box (77) after fitting the stationery seal seat (66.1).
❑
Mount the rotating part of the seal, ensuring that the two seats touch.
❑
Lock the grub screws after positioning the seal as shown in the table below.
NB: The table shows the diameter D of the shaft and the distance L2 between
the seal (66.1) and the seal box (77) when the rear cover (09) is not fixed in
place but only resting on the rear of the rotor (fig.26).
For the V25-2, is not necessary to fix the grub screws because the seal is dou-
ble with a single rotating part. It is therefore sufficient to finish mounting the seal
and, once the seal boxes are mounted, make the grub screws coincide with one
of the two flush holes on the rear seal box and fix them.
❑
Mount the rotating part of the seal (66.2) with the seat facing upwards and fix the
grub screws.
❑
Mount the seal box (81) after fitting the stationary seal seat (66.2).
❑
Mount the pedestal and fix the rear cover temporarily to the pedestal. Screw on
the shaft lock nut with its lock washer.
❑
Mount the outer bearing lock ring (14) and tighten the seal box screws.
❑
Mount the casing and cover and adjust the rotor position as described in para-
graph 10.4.
Attention: The cover (04) must be mounted correctly. The idler pin (06) must be
positioned symmetrically between the two ports in the shorter path between the
ports.
❑
Block the security dowels (45) of the lock rings (14,15) ( models V25-2 and V30-2
do not have security dowels).
fig.23
fig.24
Dimension L1 for standard seals ISO 3069 DIN 24960
for pumps serie K
Pump type
D
(mm)
L1
(mm)
V25-2
V30-2
V50-3
V60-2
V70-2
V80-2
V85-2
V90-2
V100-2
V120-2
V150-2
V151
V180
V200
22
22
30
35
40
40
40
55
55
70
70
70
80
90
-
-
6
4,5
15,5
15,5
15,5
8
8
9,5
9,5
9,5
24
19
-
-
-
-
-
-
-
-
-
-
-
-
-
25
L1
bis (mm)
fig.25
fig.26
Dimension L2 for standard seals ISO 3069 DIN 24960
for pumps serie K
Pump type
D (mm)
L2 (mm)
V25-2
V30-2
V50-3
V60-2
V70-2
V80-2
V85-2
V90-2
V100-2
V120-2
V150-2
V151
V180
V200
22
22
30
35
40
40
40
55
55
70
70
70
80
90
-
-
16,5
15
22,5
22,5
22,5
27,5
27,5
14,5
14,5
14,5
45,5
40,5
