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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
DN
40 - 50
65 - 80
100
125 - 150
200
250
300
Type
DRV / DAV
MBV / RBS
Control
valve
NAZ
Nominal size
DN
40 - 50
65
80
100
125 - 150
200
250
300
) = Note designation on screw head A2 – 70 or A4 – 80!
1
Attention:
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
-23-
Hex bolt
Strength
M
class
M 8
M 10
M 12
M 16
A4/80
M 20
M 20
M 20
Socket
Strength
M
class
M 6
A2 / A4 / 70
Hex bolt
Strength
M
class
M 6
A2 / A4 / 70
(Not for new applications)
Hex bolt
Strength
M
class
M 8
M 10
M 10
M 12
A2/70
M 16
M 20
M 20
M 20
Tightening torque
1
)
Target
22 Nm
47 Nm
84 Nm
172 Nm
285 Nm
285 Nm
380 Nm
Tightening torque
1
)
Target
8 Nm
Tightening torque
Target
8 Nm
Tightening torque
1
)
Target
17 Nm
33 Nm
40 Nm
70 Nm
172 Nm
280 Nm
280 Nm
235 Nm
2
Max.
)
25 Nm
50 Nm
87 Nm
216 Nm
423 Nm
423 Nm
423 Nm
Max.
8.5 Nm
Max.
8.5 Nm
Max.
19 Nm
36 Nm
40 Nm
72 Nm
172 Nm
285 Nm
285 Nm
240 Nm
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