B Operating Instructions for Rotary Joints Series DX/DXS
5
.
Information
on design and mounting and operation
12/27
© 2011 by Christian Maier GmbH & Co. KG Maschinenfabrik
This document may not be copied or disclosed to third parties.
All rights, including copyright and property rights, reserved by Maier.
AB-DX_en – Version 08 – 01.03.2011
B
Install an additional safety unit:
Install a torque monitoring system or a bearing monitoring system with vibration
pickup (e.g. FAG or SKF) with connection to the emergency shutdown system in or-
der to avoid bearing damage and consequential damage.
Refer to the section "Specifications and Spare Parts" for limit values concerning the
admissible friction torque. Section 6.2 provides an example of the possible anti-
rotation design of the housing.
If the monitoring system is activated, the rotation of the roller should be stopped im-
mediately and the supply of the fluid should be interrupted upstream of the metal
hoses.
Center the inner pipe and the roller as well as the rotary joint. Run-out and axial ten-
sion of the inner pipe will lead to malfunctions of the rotary joint.
In the case of greater nominal diameters of the rotary joint, long inner pipes or high
speeds, it is recommended to separate the inner pipe in the area of the rotor connec-
tion. Section 6.1 provides an example of the possible design. This facilitates mount-
ing of the rotary joint and, in the case of DXR 2/DXSR 2 rotary joints, reduces the
wear and tear at the bearing bushing for the inner pipe.
In the case of a rotary joint with rotating inner pipe, version DXR 2/DXSR 2, it is rec-
ommended to use a stainless steel inner pipe or at least a hard chromium-plated
bearing seat.
Operation with water exceeding 70°C:
In order to ensure maximum reliability and service life of the seal in the rotary joint,
the hot water used in the rotary joint must be processed, treated and conditioned ac-
cording to the VdTÜV Guidelines Technical Chemistry 1466 (VdTÜV - Merkblatt
Technische Chemie 1466). The circulated water must have a low salt concentration
and a maximum conductivity of < 100
μ
S/cm! If the water contains salt, this may re-
sult in deposits in the seal gap and premature failure of the seal.
For ATEX-certified products (directive 94/9/EC)
Check the resistance between the rotary joint and the system, if necessary, use equi-
potential bonding conductors.
Determine the maximum temperature of the system, if necessary, install a safety
thermostat.
INFORMATION
Refer to section 3.4 for additional information.
