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.

More information.

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.

Do you have any questions? - We will be happy to help you!

We and our independent sales and service partners are available to you worldwide at any time.
Please contact us by phone or e-mail or use our inquiry form and we will get back to you shortly.

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Areas of application for our screw pumps

Screw pumps for conveying and dosing tasks.

Pumping liquids is a demanding task, especially with abrasive or lubricating media. When selecting a self-priming screw pump or booster pump, the pumped liquid, operating conditions, installation location, standards and guidelines must be taken into account. Sound application knowledge is essential for this.
KRAL contributes this knowledge with over 70 years of experience in the manufacture of self-priming screw pumps.

Screw pumps according to application areas.

Bitumen applications.
Burner applications.
Pressure boosting and circulation applications.
Hydraulic applications.
Fuel supply applications.

Do you have any questions?

Screw pumps

Just send us a short message and we will be happy to answer your questions by phone or e-mail.

Technical data of our screw pumps

K series

L series

C series

CK series

CL series

CG series

W series

Hydraulic pump flange lubricating oil pump series W

Technical data		15-26	32-54	55-85	105-118
Qth (1450 min-1, 0 bar)	l/min	15-26	32-54	55-85	105-118
Max. Pressure flange	bar	120	120	120	120
Temperature max. pumped liquid	°C
with radial sealing ring NBR		90	90	90	90
with radial sealing ring FKM		150	150	150	150
with mechanical seal standard		150	150	150	150
with mechanical seal hard material		180	180	180	180
Magnetic coupling		300	300	300	300
Viscosity	mm²/s
min.		1	1	1	1
max.		100000	100000	100000	100000
Max. Pressure suction flange	bar
with radial sealing rings		6	6	6	6
with mechanical seal standard		6	6	6	6
with mechanical seal hard material		6	6	6	6
Magnetic coupling		6	6	6	6

Z series

MAG series

G series

The KRAL G series is an industrial-grade solution for pumping lubricants. The pumps are available in six sizes and therefore cover a wide performance spectrum. The low-maintenance operation is a significant advantage for continuous use.

The pumps work reliably at viscosities of up to 500 mm²/s and temperature ranges from -10 to 120 °C, optionally even up to 300 °C. The compact design allows use in space-critical applications. All housing parts can be mounted in 90° steps.

Numerous options - from cartridge seals to tank installation variants - make the series extremely adaptable. The ATEX and API 676 approvals also enable use in international projects with high safety and standard compliance requirements.

EK / EL serie