Operating Instructions
10/2010
1096.0799 | VU / VH Series
43
9.2.10.6
Impeller
nuts
(
Cross-sectional drawing, Item 922)
Type
Dimensions
Tightening torque
[Nm]
VU/VH 80 – 220
M 40x1.5
110
VH 300 - 350
M 45x1.5
170
VU 351 - 451
M 48x1.5
205
VU 300/450
M 52x1.5
264
VU/VH 500/600
M 54x1.5
290
VU/VH 800-1600
M 78x2
600
Tab. 33 Tightening torques for impeller nut
9.2.10.7 Shaft nut for fixed bearings
(
Cross-sectional drawing, Item 921)
Type
Dimensions
Tightening torque
[Nm]
VU/VH 80-220
M 30x1.5
31
VH 300-350
M 40x1.5
75
VU 351-451
M 40x1.5
165
VU 300/450
VU/VH 500/600
M 45x1.5
108
VU/VH 800-1600
M 60x2
260
Tab. 34 Tightening torques for shaft nuts stabilising fixed bear-
ings
9.2.10.8 Casing
bolts
(
Cross-sectional drawing, Item 563)
Casing bolt size
Tightening torque [Nm]
M 6
8.5
M 8
12
M 10
25
M 12
40
M 16
90
M 20
120
M 24
140
Tab. 35 Tightening torques for casing bolts
9.3 Conical pipe fittings
The above specified tightening torques do not apply to conical
screw-in threads. Here, tightness is not achieved by using a
specific tightening torque but by additional sealing material
(e.g. sealing tape, adhesive).
9.4 Permissible
forces / torques acting
on the pump nozzles
Nominal width
Pump nozzle
M
x
, M
y
, M
z
[Nm]
F
x
, F
y
, F
z
[N]
DN 6
20
65
DN 8
27
88
DN 10
35
110
DN 15
44
140
DN 20
55
177
DN 25
70
222
DN 40
100
320
DN 50
140
430
DN 65
170
510
DN 80
200
600
DN 100
255
770
Tab. 36 Permissible forces/torques acting on the pump nozzles
9.4.1 Adjustment
dimensions
9.4.1.1
Impeller gap VU 20–40/VH 20-60
Type
1st stage
2nd stage
VU 20
0.14 mm +0.02
VU 40
0.14 mm +0.02
VH 20
0.14 mm +0.02
0.10 mm +0.01
VH 40
0.14 mm +0.02
0.14 mm +0.02
VH 60
0.14 mm +0.02
0.14 mm +0.02
Tab. 37 Gap sizes of impeller gap VU 20–40/VH 20-60
9.4.1.2
Impeller gap VU/VH 80-1600
The total gap size is approx. 0.33 mm per stage.
