- Offer Profile
- DST -
Permanent Magnetic Couplings
Leakage-free transmission is essential in process technology today owing to
environmental protection reasons. Highly toxic or aggressive media require
hermetically sealed drives for pumps, agitators etc
Product Portfolio
DST Permanent Magnetic Systems




- • Today leakage-free transmission is essential in
process technology owing to environmental protection reasons. Highly toxic
or aggressive media require hermetically sealed drives for pumps, agitators
etc.
• DST ST permanent magnetic couplings optimally comply with the increasing
environmental safety protection awareness. High torques can be safely
transmitted wear-free through the vessel walls. If the maximum torque is
exceeded, the torque transmission will be interrupted so that overload
protection is always guaranteed.
• The well proven compact and high-performance magnetic couplings from DST
apply rare earth magnets with excellent magnetic capacities.
• A significant performance advantage of the DST magnetic coupling is the
freedom from wear in contrast to dynamic seals. This offers DST customers a
competitive
advantage in a growing worldwide market with applications in the chemical,
pharmaceutical and plastics industries.
Applications
• DST permanent magnetic couplings from DST using contact-free torque
transmission are installed in the following areas:
• Chemical industry
• Pharmaceutical industry
• Food industry
• Biotechnology
• Industrial ovens
• Compressors
• Metering
• Batching
• Hydraulics
Materials
• The permanent magnetic coupling components in contact with the medium are
selected from the following materials:
• 1.4571 / AISI 316 Ti
• Hastelloy
• Titanium
• 1.4435 / AISI 316 L
• 1.4539 / AISI 904
• 1.4301 / AISI 304
• 1.4462
• Plastic
Standard Construction Ranges
- Performance spectrum
• The broad spectrum of the DST standard construction range covers
centrifugal pumps, rotating piston pumps, liquid ring pumps as well as
agitators with differing torque ratings.
• Individual intermediate solutions are also available.
• Customer specific special solutions further down.
Construction of DST permanent magnetic coupling
• Outer ring
• Canister (the shell is in Hastelloy from size 75/10)
• Inner rotor completely encapsulated in AISI 316 Ti stainless steel
• Magnet material Sm² Co17*

Standard construction range
DST permanent magnetic coupling
Special Designs
- Individual Solutions
• In direct cooperation with our customers the requirements for practical
and specific coupling systems are individually evaluated.
• Thereafter the optimum cost/performance design is produced by DST using
CAD systems.
Advantages sm2Co17 vs. NdFeB
• Very high energy product
• High coercivity (resistance to demagnetization)
• Stable at high temperatures up to 350° C
• Very corrosion resistant

Magnetic coupling for pumps and agitator drives power 1 - 2000
Nm

Optimum system adaptability of DST-magnetic couplings

Demagnetization curve of Sm2 Co17 and Nd Fe B at room
temperature and at 150° C. Sm2 Co17 - magnets are suitable for
temperatures up to appr. 350° C.
Conversion Kits
- Application Areas
• Conversion kits can be retro-fitted in many areas, for example: PU
machines, Hydraulic applications
• DST conversion kits allow a combination with all major makes of pumps and
drive motors.
• We will evaluate specific applications to produce a functional combination
in order to utilise the advantages of “hermetically sealed” and “wear-free”
in an optimum
way.

Application example
Conversion kit for hydraulic pump
with DST permanent magnetic
coupling and ABB drive motor

Application example
Conversion kit for hydraulic pump
with DST permanent magnetic
coupling and ABB drive motor
Bearings
- Silicium carbide - ceramic plain bearings
• Complete SSIC - Ceramic plain bearings are available as axial and radial
types, predominantly for use in centrifugal pumps, combined with the DST
standard permanent magnetic coupling.

SSIC Ceramic bearing in a
centrifugal pump

Plain bearings for diverse media and
temperature ranges
Agitator Drives
- Individual Solutions
• In direct cooperation with our customers the requirements for practical
and specific coupling systems are individually evaluated.
• Thereafter the optimum cost/performance design is produced by DST using
CAD systems.
Advantages sm2Co17 vs. NdFeB
• Very high energy product
• High coercivity (resistance to demagnetization)
• Stable at high temperatures up to 350° C
• Very corrosion resistant

Magnetic coupling for a plastics pump
- The wetted areas of the inner rotor are
coated with PP, PFA or PVDF for installations in critical media for
the chemical industry.

Agitator drive for the pharmaceutical
and food industry - Bottom mounted drive - hermetically sealed!
- Using a bottom mounted agitator drive,
the agitator is hermetically sealed, thus
preventing any contamination of the
product.

Agitator drive for the
chemical industry - Overhead mounted drive - vapour sealed!
- The overhead drive prevents the escape of any
hazardous gases or the ingress of contamination during agitation.