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E. Annex
1. Torques
When assembling the base valve and the control valves all
bolts
are checked with a torque spanner
according to the following list. Lightly grease the bolts before assembling!
Nominal size
Hex bolt
Strength
Tightening torque
B
ase valv
es
DN
M
class
1
)
Target
Max.
2
)
40 - 50
M 8
A4/80
22 Nm
25 Nm
65 - 80
M 10
47 Nm
50 Nm
100
M 12
84 Nm
87 Nm
125 - 150
M 16
172 Nm
216 Nm
200
M 20
285 Nm
423 Nm
250
M 20
285 Nm
423 Nm
300
M 20
380 Nm
423 Nm
C
o
n
tr
o
l
va
lves
Type
Socket
Strength
Tightening torque
M
class
1
)
Target
Max.
DRV / DAV
M 6
A2 / A4 / 70
8 Nm
8.5 Nm
MBV / RBS
Control
Hex bolt
Strength
Tightening torque
valve
M
class
Target
Max.
NAZ
M 6
A2 / A4 / 70
8 Nm
8.5 Nm
(Not for new applications)
B
ase valv
es
Nominal size
Hex bolt
Strength
Tightening torque
DN
M
class
1
)
Target
Max.
40 - 50
M 8
A2/70
17 Nm
19 Nm
65
M 10
33 Nm
36 Nm
80
M 10
40 Nm
40 Nm
100
M 12
70 Nm
72 Nm
125 - 150
M 16
172 Nm
172 Nm
200
M 20
280 Nm
285 Nm
250
M 20
280 Nm
285 Nm
300
M 20
235 Nm
240 Nm
Caution:
1
) = Note designation on screw head A2
– 70 or A4 – 80!
2
) = Maximum permitted torque according to strength analysis
Bolts according to SN EN ISO 4014 and SN EN ISO 4017
As at: FO 0065, Rev. 12 / 19.12.2017