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Edition: 2021-04 Original document - Mi-205 EN
The fastening torque at the table are valid for new, properly fixed stuffing boxes. If
the threads are not lubricated, the highest torque specifications are valid.
By leakage while operating, the compression of the stuffing box can be improved
by higher torque values.
Generally: To aviod a leakage, all the nuts have to be fastened the same, only little
differences at the torque are tolerated.
DN
Shaft ø
(mm)
Stuffing box ø
di/dy (mm)
Tightening torque,
graphite stuffing box
(Nm
Tightening torque,
PTFE stuffing box
(Nm)
80*,100,125 20 20/30 6 10
150,200 25 25/35 10 10
250 30 30/40 12 15
300 35 35/45 15 15
350 40 40/55 25 25
400 50 50/65 40 35
500 60 60/75 60 50
4.2.2 Recommended fastening torque for MTV/FSV stuffing box
Tab.4-4 Torque for MTV/FSV stuffing box
* DN80 only for MTV
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