INSTALLATION
Series 091
10/27
Edition 19.05.2021
1088779EA
4.2.1
Admissible forces and bending moments
Forces from evacuating the system, from the weight of other components or from
baking can lead to deformation of the valve body and to malfunction of the valve. The
stress has to be relieved by suitable means; e. g. bellows sections.
The following forces or bending moments are admissible:
DN (nom. I.D.)
Axial tensile or com-
pressive force «FA»
Bending moment «M»
mm
inch
N
lbf
Nm
lbf
∙
ft
50
2
500
112
30
22
63
2½
1960
440
78
58
80
3
2450
560
98
72
100
4
2450
560
98
72
160
6
2940
660
147
108
200
8
2940
660
147
108
If a combination of both forces («FA» and «M») occurs, the values
mentioned above are invalid. Please contact VAT for more information.
Table 4-2
1.
Remove protective covers from body flanges.
2.
Clean sealing surfaces and seals of both flanges;
see (1) and (2) according to «Figure 4-1».
The valve seat side is marked with the symbol «
» on flange «A».
3.
Lift valve to the mounting position.
4.
Mount the four screws (3) according to «Figure 4-1», evenly in crosswise order until the seal
touches the sealing surface.
3
1
2
1 Flange A
2 Flange B
3 Screws
Figure 4-1
5.
Tighten all screws with the torques appropriate for their property classes.
