Flange Flange The flange is designed for mounting the pump into a tank.

Installation Installation When installed in the tank, the discharge flange is located above the tank cover.

Leakage Leakage The internal leakage return is especially important in case of dry-well installation.

Hydrodynamic balance Hydrodynamic balance Hydrodynamic balance is applied to reduce wear and noise emission.

KRAL W Series Screw Pumps.

The KRAL pump for difficult fluids.

The W series from KRAL is primarily used when dirty or low-viscosity media are used. Robust polymer coating and continuous flow rates at differential pressures up to 120 bar – these features are combined in the KRAL W series screw pump.

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Overview Screw Pumps W Series Screw Pumps Apercu Pompes a vis Przeglad Pompy srubowe Vista general Bombas de husillo roscado Visao geral Bombas parafuso Обзор Винтовые насосы

Operation, materials, components.

Delivery rate: 15 to 290 l/min.
Max. differential pressure: 120 bar.
Viscosity: > 1 mm²/s.
Max. temperature: To 180 °C, magnetic coupling to 300 °C.
Installation: Wet or dry.
Spindle housing: Nodular cast iron EN-GJS-400, polymer-coated or other material options.
Screws: Steel, nitrided.

Optimum pump for special requirements.

Pumped fluids such as cooling lubricants are difficult liquids. They contain abrasive dirt, mostly metal residues, and must be pumped at high pressure. In addition, they have a very low viscosity of only about 1 mm²/s.

In the KRAL screw pump of the W series, the screw material and the casing coating have been designed for improved sliding properties in such a way that low viscosity fluids can be pumped with high efficiency.

The running casing is coated with a resistant polymer that can absorb particles. The balancing cylinder of the screw pump has orifice insertions to reduce the leakage rate, therefore efficiency remains high.

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KRAL pumps for special requirements.

Compared with other screw pump principles, KRAL screw pumps offer a high flow rate while requiring little space. KRAL pumps deliver continuously and with low pulsation, which protects the pumped media even under difficult conditions.

Installation options.

The KRAL W series screw pump can be designed for dry or wet-well installation. For a vertical wet-well installation, a mounting plate is provided.

Your advantages.

Resistant, polymer-coated running casing absorbs particles.
High pressure up to maximum 120 bar at low viscosity.
Conveying abrasive liquids.
Gentle conveying of the liquid.
Low pulsation, quiet.
Multiple installation variations available.
For many different applications – as you can see in our product catalog or on our website pump overview.

Technical data.

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 at pressure flange	bar	120	120	120	120

Temperature max. pumped liquid	°C
with radial shaft seal NBR		90	90	90	90
with radial shaft seal FKM		150	150	150	150
with mechanical seal standard		150	150	150	150
with mechanical seal hard material		180	180	180	180
with magnetic coupling		300	300	300	300

Viscosity	mm²/s
min.		1.0	1.0	1.0	1.0
max.		100,000	100,000	100,000	100,000

Max. pressure at suction flange	bar
with radial sealing ring		6	6	6	6
with mechanical seal standard		6	6	6	6
with mechanical seal hard material		6	6	6	6
with magnetic coupling		6	6	6	6

Operation, materials, components.

Optimum pump for special requirements.

KRAL pumps for special requirements.

Installation options.

Your advantages.

You have several options for finding the right operating instructions/product information sheet:

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OIK 14 | Screw pump | K | Mechanical Seal

OIK 07 | Screw pump | K | Radial shaft seal

OIK 09 | Screw pump | K | Magnetic coupling

OIK 10 | Pump station | EKL/EKS | –

OIL 01 | Screw pump | L | Mechanical seal / Radial Shaft Seal

OIL 02 | Screw pump | L | Magnetic coupling

OIL 03 | Pump station | ELL/ELS | Mechanical seal / Radial Shaft Seal

OIC 01 | Screw pump | CK | Mechanical seal / Radial Shaft Seal

OIC 02 | Screw pump | CL | Mechanical seal / Radial Shaft Seal

OIC 10 | Screw pump | CG | Magnetic coupling

OIC 13 | Screw pump | CL | Magnetic coupling

OIC 18 | Screw pump | CG | Mechanical seal / Radial Shaft Seal

OIM 01 | Screw pump | M | Mechanical seal / Radial Shaft Seal

OIM 05 | Screw pump | M | Magnetic coupling

OIN 04 | Screw pump | NS | Radial shaft seal

OIW 01 | Screw pump | W | Mechanical seal / Radial Shaft Seal

OID 02 | Pump station | DKC/DLC | Mechanical seal / Radial Shaft Seal

OID 03 | Pump station | DKC/DLC | Magnetic coupling

OID 05 | Pump station | DL2 | Mechanical seal / Radial Shaft Seal

OID 06 | Pump station | DL3/DL4/DS1/DS3/DS4 | Mechanical seal / Radial Shaft Seal

OID 07 | Pump station | DL3/DL4/DS1/DS3/DS4 | Magnetic coupling

OIO 08 | Flowmeter | OMH | –

OIO 14 | Flowmeter | OMG | –

OIO 15 | Flowmeter | OME | –

OIO 20 | Flowmeter | OME compact | –

OIO 23 | Flowmeter | OMP | –

OIO 28 | Flowmeter | OMX | –

OIO 30 | Flowmeter | OMS | Low-viscosity liquids

OIO 31 | Flowmeter | OMS | High-viscosity liquids

OIO 03 | Flowmeter | OMK | –

OIE 26 | Elektronics | BEM 100 | –

OIE 29 | Elektronics | BEM 100 | Support-Software Smart Support

OIE 29 | Elektronics | BEM 150 | Support-Software Smart Support

OIE 27 | Elektronics | BEM 150 | –

OIE 24 | Elektronics | BEM 200 | –

OIE 15 | Elektronics | BEM 300 | –

OIE 23 | Elektronics | BEM 300 | Modbus communication

OIE 22 | Elektronics | BEM 500 | Modbus communication

OIV 01 | Elektronics | BEM 500 | Differential measurement

OIE 12 | Elektronics | BEM 500 | –

OIE 30 | Elektronics | Smart Solution Display | –

OII 08 | Sensors | EET | Temperatur sensors

OII 02 | Sensors | BEG | Pick up

OIG 01 | Screw pump | G | Mechanical Seal

OPR 01 | Screw pump | K | Product information sheet

OPR 02 | Screw pump | K | Product information sheet

OPR 03 | Screw pump | K | Product information sheet

OPR 04 | Screw pump | K | Product information sheet

OPR 07 | Screw pump | L | Product information sheet

OPR 05 | Screw pump | K | Product information sheet

OPR 06 | Screw pump | K | Product information sheet

OPR 08 | Screw pump | L | Product information sheet

OPR 09 | Screw pump | CK | Product information sheet

OPR 10 | Screw pump | L | Product information sheet

OPR 11 | Pump station | DKC/DLC | Product information sheet

OPW 01 | Screw pump | K | Product information sheet

OPW 02 | Screw pump | K | Product information sheet

OPW 03 | Screw pump | K | Product information sheet

OPW 04 | Screw pump | K | Product information sheet

OPW 09 | Screw pump | K | Product information sheet

OPW 10 | Screw pump | K | Product information sheet

OPW 11 | Screw pump | K | Product information sheet

OPW 12 | Screw pump | K | Product information sheet

OPW 13 | Screw pump | K | Product information sheet

OPW 15 | Screw pump | K | Product information sheet

OPW 16 | Screw pump | K | Product information sheet

OPW 17 | Screw pump | K | Product information sheet

OPW 18 | Screw pump | K | Product information sheet

OPW 19 | Screw pump | K | Product information sheet

OPW 20 | Screw pump | K | Product information sheet