Christian Maier GmbH & Co. KG
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Operating manual Series DP_en –Part-S- Version 9 – 27.05.2020
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Limit values for the friction torque at the rotary joint
Maier series DP rotary joints are equipped with contacting seals and rolling bearings. The table below lists
the friction torque depending on the nominal width DN generated during rotation at maximum operating
pressure and speed of rotation to allow for torque monitoring recommended for safety reasons.
The following applies to the individual columns:
Column Normal:
The friction torque to be expected during normal operation.
Column Warning:
If these values are exceeded, the rotary joint and the installation
should be checked within the next 3 days.
Column Stop:
If these values are exceeded, stop the rotary joint immediately
for safety reasons; check and repair it, if necessary!
Friction torque for Maier rotary joints series DP
at maximum pressure PN
(Observe the information provided below)
DN
Normal
in Nm
Warning
in Nm
Stop
in Nm
06
0,2
0,4
0,6
10 - 50
2
4
6
65
6
12
18
75
8
16
24
80
8
16
24
100
10
20
30
Further torques may be generated during operation of the rotary joint in addition to the friction torques
listed. These additional torques may be caused by tilting as a result of horizontal housing connection
pieces, shut-off valves mounted directly to the housing connection piece or by righting forces generated
by the metal hoses for the supply of the fluid. If the roller with the connected rotary joint is to move during
running, the hoses may also cause additional loads as a result of righting forces of the hoses.
All these additional loads which cause an additional torque must be considered in defining the switching
point for the pre-alarm and the main alarm.
