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Stirrer drives / magnetic couplings

Reactor Systems

The stirrer shaft sealing is a key component of chemical reactors. It results in leakage-free operation of the rotating stirrer shaft. A stirrer shaft sealing shall be dry–running; avoiding any contamination of the chemistry by a lubricant. The stirrer is an important piece of equipment, it is responsible for mixing and heat transfer, so the dimensions and shapes are crucial.
Leak-free stirring systems for pressure reactors. Also available with ATEX or for inert fluids.

The use of stirrer drives / magnetic couplings

For pressure reactors, stirrer drives with magnetic couplings are used. Due to their static sealing, they can be operated at full vacuum and very high pressures and high temperatures, for mixing of very high viscosity media.

BÜCHI magnetic couplings (bmd type), equipped with stirrer motor, speed transmission and optional frequency converter to adjust the stirrer speed (ATEX version) form a complete stirrer drive for Laboratory- and larger Pilot Plant reactors.

BÜCHI stirrer drives type cyclone with integrated magnetic coupling and electronic speed controller are used for torques up to 300 Ncm and as non-Ex version for laboratory use.
Metal-free magnetic couplings (bmd 250 I) and stirrer drives (cyclone 250 i ac) feature inert behaviour and full corrosion resistance, as no metal can get in contact with the process media.

Advantages of our magnetic stirrer drives

  • Robust, compact design
  • Absolutely tight
  • Safe
  • No externally moving parts
  • Metal-free executions available
  • Integrated motor and controller
  • EX proof
  • Dry running mechanical sealings

Technical data of our stirrer drives / magnetic couplings

Torque range
50 – 5400 Ncm
Stirrer speed
0 – 3000 rpm
-1.0 (FV) up to +500 bar / 6000 psi
-50°C to +500°C
stainless steel, Hastelloy®, tantalum, titanium, ceramic, others
ATEX, material certificates

Suurmond supplies solutions to optimize your process and improve the quality of your end-product. Our specialists will be happy to advise you.

Let's talk!

High pressure reactors
Low - high torque magnetic coupling
High pressure reactors
Low - high torque magnetic drives
High pressure reactors
Metal-free/ Inert stirrer drives
High pressure reactors
EX-proof stirrer drives

Let's talk!

Suurmond BV
The Netherlands
T +31 (341) 25 49 00 

Voltweg 2
8071 CZ Nunspeet

CoC 08142400
VAT NL815360800B01

Suurmond BV
Belgium and Luxembourg
T +32 (3) 54 44 070

Noorderlaan 109
2030 Antwerp

Company no. 0440573109
VAT BE-0440.573.109

Suurmond UK Ltd
Great Britain & Ireland
T +44 (1386) 423 756

7e Enterprise Way
Evesham, Worcester

Registration no. 5113524
VAT GB 845 7137 10

Suurmond (France)
T +33 (474) 02 66 75

Parc Millésime, bâtiment 4
119 rue Michel Aulas
69400 Limas

VAT: FR59815325303
Registration no.: 59 815 325 303

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