7 Servicing/Maintenance
30 of 40
BOA-H Mat P
7.4.3 Fitting the trim components
561
920.3
45-6
411.2
200
350
Fig. 12:
Fitting the valve disc and stem
1. Insert the new stem/valve disc assembly carefully into bonnet 161 from below.
2. Insert new bonnet gasket 411.2.
3. Place bonnet 161 onto the valve body.
4. Tighten bonnet nuts 920.3 crosswise to the specified tightening torque.
5. Tighten stuffing box screw 45-6, depending on the valve design.
6. Mount the actuator.
7.5 Tightening torques
Bonnet nuts and actuator pillars
Table 7:
Tightening torques for hexagon nuts [Nm]
Thread size
Tightening torque
M10
32
M12
56
M16
135
M20
250
Flange nuts
Table 8:
Torques for hexagon nuts and slotted round nuts [Nm]
Thread size
Tightening torque
M39
750
M50
1100
Graphite gland packing
Table 9:
Tightening torques for stuffing box screw [Nm]
DN
Assembly torque
In-service torque
20 - 50
10
3
65 - 100
15
4
125 - 150
18
5
Summary of Contents for BOA-CVP H
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