ASAHI AV VALVES Installation Operation and Maintenance Manual
Butterfly Valves Type57L-IS (Lug style) 7
- The parallelism and axial misalignment of the flange surface should be under the values shown
in the following table to prevent damage the valve.
(A failure to observe them can cause destruction due to stress application to the pipe)
Unit: inch (mm)
Nom. Size Axial Misalignment Parallelism (a – b)
3”
(80mm)
0.04”
(1.0)
0.03”
(0.8)
4”, 6”
(100, 150mm)
0.04”
(1.0)
0.04”
(1.0)
8”
(200mm)
0.06”
(1.5)
0.04”
(1.0)
- When you insert a valve between flanges, please
insert after extending the fields of flanges fully.
(If you insert a valve by force without fully extending
fields of flanges, a liner may be turned over and
suffer a crack.)
- Tighten the bolts and nuts gradually with torque wrench to the specified torque in a diagonal manner.
- Avoid excessive tightening. (The valve can be damaged.)
Recommended torque value Unit Nm kgfcm [lbinch]
Nom. Size 3”, 4”
(80, 100mm)
6”
(150mm)
8”
(200mm)
Torque value
30.0
{306}
[266]
40.0
{408}
[355]
55.0
{561}
[488]
Caution
(Axial Misalignment) (Parallelism)
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