For ATEX zones. For ATEX zones. Containment shroud with temperature sensor for use in potentially explosive gas atmospheres (ATEX zones 1 & 2).
Reliable sealing. Reliable sealing. Adequate elastomer selection for reliable sealing of critical points.
Standard magnetic coupling. Standard magnetic coupling. Hermetically sealed thanks to magnetic coupling.
Almost maintenance-free. Almost maintenance-free. Selected materials and compensated axial load ensure maintenance-free operation over several years (up to 40,000 operating hours), despite the low lubricity of the Future Fuels.
Corrosion-resistant screws. Corrosion-resistant screws. Screws made of stainless steel with high surface hardness and optimized sliding features.
Balanced auxiliary screws. Balanced auxiliary screws. Hydraulically balanced auxiliary screws for minimum axial forces and low-noise operation.
Polymer coating. Polymer coating. Polymer-lined housing bore for outstanding sliding properties and minimal friction.

KRAL F Series Screw Pumps.

The screw pump for Future Fuels.

When future meets experience.
In the ever-changing world of energy technologies, future fuels play a key role. They do not only promise a more sustainable alternative to conventional fossil fuels, but also drive innovation and efficiency in various industrial applications. The KRAL Future Fuels pump offers high efficiency for various Future Fuels and a wide range of applications thanks to the use of corrosion-resistant stainless steels.


Operation, materials, components.

  • Delivery rate: 5 to 280 l/min.
  • Viscosity: 0.2 to 500 mm2/s.
  • Rotation speed: up to 4,000 min-1.
  • Max. differential pressure: 120 bar.
  • Max. temperature: +80 °C.
  • ATEX: Zone 1 & 2.
  • Future Fuels: Biofuels, Methanol, Ammonia, Ethanol, LFO, HVO, FAME.

KRAL F series at a glance.

All media wetted parts made of stainless steel.
Hermetic sealing with magnetic coupling.
Approved for use in in ATEX Zone 1 & 2.
Differential pressures up to 80 bar (LFO, biofuels) / max. 60 bar for methanol and up to 40 bar for ammonia.
Excellent efficiency degree.
Low pulsation and low shear conveying.
Almost linear conveying characteristics.
Very low noise emissions.
Suitable for fuels with acid value > 0.5 mg KOH/g.


  • Technical data.
    Technical data 15-20 32-42 55-74-85 105-118
    Delivery rate
    (2,900 min-1, 40 bar, 1 mm2/s)
    l/min up to 25 up to 60 up to 120 up to 180
    Max. differential pressure  bar 120 120 120 120
    Max. temperature °C 80 80 80 80
    Viscosity mm²/s >0,2 >0,2 >0,2 >0,2
    Max. rotation speed min-1 4,000 4,000 4,000 4,000
    Max. supply pressure bar 16 16 16 16
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