Robust, versatile and easy to maintain.

Versatile, compact and efficient like the K series, but for higher operating pressures up to 63 bar: the KRAL L series screw pump is the preferred choice for medium-pressure applications in the marine sector as well as numerous applications in the oil and gas, power generation, mechanical engineering and chemical industries. It has a housing made of ductile iron and is approved for use on board ships.

The KRAL L series uses lifetime-lubricated, externally mounted ball bearings. High-temperature-resistant sealing washers made of a fluorocarbon rubber compound (FKM) prevent washout. This increases the bearing service life and reduces maintenance costs.

KRAL - Your expert for pump technology.

"Quality, innovation and speed, at all times and worldwide."

Since the company was founded, KRAL has positioned itself as a manufacturer of quality products at a fair price/performance ratio, offering customized solutions for systems, from engineering to commissioning, both locally and worldwide. Our after-sales service is also there for you after your purchase.

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Advantages of the KRAL screw pump.

In comparison to other pump designs, KRAL screw pumps convey a wide range of media, qualities and viscosities in consistently high quantities, even at high differential pressure. Further advantages are the compact design and high flexibility.

No clutch damage.

Some pumped liquids form residues that can cause pump failure. Residues typically form on the mechanical seal. The ball bearing is damaged by the residue, runs hot, the intermediate coupling ring melts and the coupling is damaged.

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Flexible connections

If the outer casing of the screw pump is made of steel, almost any position, direction, size, type and classification of the flange is possible. It can be optimally adapted to any installation situation.

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Housing variants

Depending on the operating requirements, the CG series screw pumps are available with cast iron or steel housings.

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External overflow valve

The overflow valve ensures that the liquid is diverted in the event of overpressure.

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Rotary shaft seal

The CK series screw pump is only available with a radial shaft seal. The CL series screw pump can be equipped with different shaft seals thanks to the longer spindle set. External ball bearings are also possible. This pump line is used as a horizontal or vertical foot pump or flange pump as well as a vertical container pump.

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Seal housing

Depending on the operating requirements, different shaft seals are possible for the CL series. The CL screw pump is the slide-in pump used in the CG series. The different housing options allow enormous flexibility in terms of fluid connections. An optional external overflow valve can be fitted to CG screw pumps.

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Longer spindle set

Thanks to the longer spindle set, external ball bearings are also available as an option.

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When commissioning the screw pump, high-quality SiC mechanical seals with graphite as a dry lubricant ensure greater safety in dry running. The O-rings with a high fluorine content are suitable for higher temperatures and are chemically resistant.

The K series screw pump offers innovative sealing concepts. A proven selection of radial shaft seals, mechanical seals and a hermetically sealed magnetic coupling are available as standard. A robust and compact design rounds off the profile.

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We and our independent sales and service partners are available to you worldwide at any time.
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Areas of application for our screw pumps

Screw pumps for conveying and dosing tasks.

Suitable for low to high viscosity, shear-sensitive and/or abrasive media
Recommended for acids and alkalis
Experience values up to 2,000,000 mPas
A pressure of up to 200 bar is available
Low pulsation due to high number of conveying chambers
Different materials are available depending on the pumped media
Various drive variants possible

Suitable for many applications, very compact, robust, flexible, excellent price-performance ratio. Perfectly adequate for pressures up to 16 bar. All K series screw pumps have an internal safety valve and can be ordered with DIN flanges in an inline arrangement (except KFT and KFN assemblies). Like all KRAL screw pumps, the pumps in the K series are self-priming, have low pulsation and, unlike other operating principles, are easily controllable.