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A.0500.551 – IM-TGMAG/02.00 EN (02/2008)
The rear axial bearing is mounted in the hub for the inner magnetic rotor, and the front axial bearing is
actually part of the circulation pump supplying lubrication and cooling for the magnetic drive.
Materials rotor bearing assembly
Metal parts: 1.4460 / duplex steel
Shaft sleeve: Silicon carbide
Axial bearing faces: Silicon carbide
Radial bearing bushes: Option (Q) silicon carbide
Option (C) carbon
3.16.3 Circulation pump
To ensure proper lubrication of the rotor bearings and cooling of the magnetic coupling a circulation
pump is providing a controlled flow over the magnetic drive. The liquid is flowing from the discharge
side of the pump via holes and grooves in the bearing assembly and the magnetic drive back to the
suction side of the pump. This circulation pump is designed as an internal gear pump where the
drive gear, integrated in the front axial bearing is driving a disk rotor which is rotating in an insert,
situated between rotor and intermediate cover. The insert and the complete rotor bearing assembly
are mounted on the intermediate cover.
Material circulation pump parts
Pump gear: 1.4460 duplex steel
Disk rotor: PEEK
Insert: 1.4460 duplex steel
3.16.4 Sealing rings and gaskets
The magnetic drive replaces a dynamic shaft sealing, so there are only static seals on TopGear MAG
pumps. The intermediate cover, separation can and pump cover are sealed with O-rings. Standard
O-ring material is FPM, but other O-ring materials can be supplied on request. The maximum
allowable operating temperature and chemical resistance must be considered for selection of the
O-ring material.
Max. allowable temperature for FPM (Fluorcarbon) = 200 °C
The topcover/safety relief valve is sealed with a graphite gasket and following sealing rings are used
to seal plugs:
Cast iron pump casing parts: Steel sealing rings with asbestos-free filling
Stainless steel casing parts: PTFE sealing rings
Rotor shaft
Shaft nut
Rear axial bearing +
Hub inner rotor
Intermediate cover
Disk rotor
Insert
Front axial bearing +
Gear of circulation pump