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Contents are subject to change without notice.
SKW/ SKF-2015-09-ENG
Table 7.Valve connection maximum tightening torque and bolt nominal diameter for steel flanges.
Valve size
(DN)
Recommended tightening
torque for flange bolt
Nm (ft-lbs)
Tapped hole
depth in body
(mm)
DIN
Bolt nominal
diameter
ANSI150
Bolt nominal
diameter
50
43 (32)
12
M16
5/8”-11 UNC
80
43 (32)
14
M16
5/8”-11 UNC
100
43 (32)
14
M16
5/8”-11 UNC
150
75 (55)
16
M20
3/4”-10 UNC
200
75 (55)
23
M20
3/4”-10 UNC
250
120 (90)
23
M20
7/8”-9 UNC
300
120 (90)
24
M20
7/8”-9 UNC
350
185 (135)
24
M20
1”-8 UNC
400
185 (135)
30
M24
1”-8 UNC
450
260 (190)
28
M24
1-1/8”-7 UNC
500
260 (190)
42
M24
1-1/8”-7 UNC
600
260 (190)
42
M27
1-1/4”-7 UNC
Figure 9.Flange bolt tightening example.
4.4
Flushing installation guidelines
Never use the valve with all flushing ports plugged.
If the medium is harmful in any way, the flushing
port must be piped to a safe location.
When valve flushing is required, customers need to provide the plumbing. The valves are
shipped with plugs installed in the flushing holes. Contact Flowrox office for process specific
instructions.
The concept of flushing is to ensure the valve does not jam due to accumulation of medium
solids in the valve body. Flushing line or drain line is also required if the medium is harmful to
people, environment or other components nearby. In other cases, the flushing connections
can be opened to prevent valve body from clogging up.
Reclaim service water is usually clean enough to accomplish the water flush, if clean water is
not readily available.
WARNING
