1No fuel residue. No fuel residue. Because the magnetic coupling is sealed, the fuel does not come into contact with the atmosphere. The heavy fuel oil cannot react with the oxygen in the air to form carbon deposits that can damage the ball bearing. This eliminates one of the major causes of pump failure.
2Function. Function. The rotation of the electric motor is transferred through the magnetic coupling to the pump screws without contact. The electric motor and the pump shaft each have a rotor with several magnets. During operation, the two rotors run in synchronized rotation.
3Hermetically sealed. Hermetically sealed. The containment can is the sealing element of the KRAL pump. It encapsulates the pump shaft and inner magnet hub.
4The magnetic coupling has no wear. The magnetic coupling has no wear. The magnetic coupling is a contact free component. The pump screws are driven without contact by the magnets on the outer and inner rotor. As there is no friction, there is no wear.
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KRAL Screw Pumps with Magnetic Coupling.

100 % leak-free.

KRAL magnetic coupling screw pumps pay for themselves quickly: they are maintenance-free, hermetically sealed (no product leakage, no crystallization of the pumped media) and temperature-resistant up to 300 °C. Frequent replacement of mechanical seals is no longer necessary, a single installation of a magnetic drive screw pump is sufficient. This saves costs.

KRAL screw pumps with magnetic coupling.

 

 

Operation, materials, components.

  • Delivery rate: 5 to 3,500 l/min.
  • Max. differential pressure: 100 bar.
  • Temperature range: -20 °C to 300 °C.
  • Housing: Nodular cast iron EN-GJS-400, steel and aluminium.
  • Screws: Steel, nitrided.
  • Approvals: ABS, BV, CCS, DNV, GL, LRS, MRS, NK, RINA.
  • ATEX: II 2 GD b/c group II, category 2.
  • Heating: Electrical, media or steam.

Leakage-free and clean.

Critical fluids containing substances endangering the health or the environment should not leak to the atmosphere. In contrast to conventional shaft seals, KRAL screw pumps with magnetic coupling are hermetically sealed by the integrated containment can. People and the environment are not endangered.

Can be used up to 300 °C.

Thermal distortion and the temperature limits of elastomeric sealing elements restrict the use of screw pumps in high temperature applications. If temperatures up to 300 °C are handled, KRAL screw pumps with magnetic coupling are the right choice.

Reduced lifecycle costs.

Spare parts and maintenance costs for mechanical seals increase the life cycle costs. Mechanical seals in KRAL screw pumps have a high technological standard. Even during proper operation, however, they are still a wearing part. KRAL screw pumps with magnetic coupling are maintenance-free and pay for themselves after just three years.

Protection of delivery medium.

With conventional seals, oxygen from the atmosphere may diffuse through the sealing gap into the fluid. When the fluid crystallizes from contact with oxygen, the process is interrupted and expensive plant shutdowns can result. KRAL screw pumps with magnetic coupling are hermetically sealed and protect the integrity of the fluid.

Favourable price.

A magnetic coupling must transmit high torques and therefore requires very strong or many magnets. It can therefore become large and expensive. Not so with KRAL: When developing the magnetic coupled screw pumps, technical optimization was just as important as the cost aspect. The result: the screw pumps and magnetic coupling are optimally matched to each other, and the magnetic coupling pumps can be offered at an attractive price/performance ratio.

Overload protection.

If the operating limits are exceeded, the screw pumps may become damaged. Solids in the fluid can lead to blockages and damage the screw and the housing. In most cases, the product produced is not to specification, and the screw pumps must be replaced. If the decoupling is controlled, and the screw  pumps stop, the screw pumps and magnetic coupling will suffer no damage. The magnetic coupling can prevent consequential damage.

Your advantages.

  • Leak-free – no collection of residues.
  • Wear-free - no maintenance.
  • Hermetically sealed - no leakage of liquid.
  • No plant standstill due to oxygen ingress.
  • Temperature resistance up to 300 °C.
  • High flow rates for all motor sizes.
  • Rapid amortisation of the investment.
  • Max. differential pressure: 100 bar.
  • For many different applications – as you can see in our product catalog or on our website pump overview.
Technical data 5-42 55-118 160-275 370-450 550-660
Qth (1450 min-1, 0 bar) l/min 5-43 59-119 166-282 368-448 543-668
             
Pressure bar 16 16 16 16 16
             
Temperature °C 300 300 300 300 300
             
Viscosity* mm²/s          
min.   2 2 2 2 2
max.   10,000 10,000 10,000 10,000 10,000
             
Speed* min-1          
50 Hz   2,900 2,900 2,900 2,900 1,450
60Hz up to 3,500 3,500 3,500 3,500 1,750
Inlet pressure bar 16 16 16 16 16

*Please ask for other data. Technical data, dimensions and weights apply for the K series. For higher pressures of up to 100 bar and flow rates up to 2,900 l/min, please provide application information for the L and C series.

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