Advanced surface treatment. Advanced surface treatment. The pump casing is specially heat treated to improve its anti-friction properties and minimize wear.

Self-venting. Self-venting. Venting between the pressure and suction side starts directly at the mechanical seal. This ensures that even if the pump is mounted vertically, any trapped air will be displaced through the medium into the vent line.

Protection from overpressure. Protection from overpressure. A built-in overflow valve protects the pump from overpressure.

Detachable end cover assembly. Detachable end cover assembly. All rotating parts such as bearing, seal and balance piston, are pre assembled in the special designed end cover. This end cover assembly can be easily removed to simplify assembly, dismantling and maintenance.

KRAL L Series Screw Pumps.

Compact, low-wear pump up to 63 bar.

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 spheroidal cast iron housing and is approved for use on board ships.

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

Operation, materials, components.

Delivery rate: 5 to 160 l/min.
Max. pressure: 63 bar.
Temperature range: -20 °C to 180 °C, magnetic coupling to 300 °C.
Viscosity: 7,000 mm²/s.
Housing: Nodular cast iron EN-GJS-400.
Screws: Steel, nitrided.
Approvals: ABS, BV, CCS, DNV, GL, LRS, MRS, NK, RINA, KR.
ATEX: II 2 GD b/c group II, category 2.
Heating: Electrical, media or steam.

L series screw pumps in the KRAL serial program.

Other pump technologies have the disadvantage that they can only be operated at low speed due to the high risk of damage. KRAL screw pumps, on the other hand, are gentle on the medium, even at high speeds. This guarantees high operating efficiency and an excellent price/performance ratio.

All screw pumps of the KRAL L series also offer reliable startup, minimal wear, and ease of maintenance, which simplify operation. Available with magnetic coupling or external ball bearing (maintenance-free).

Easy servicing.

The main spindle of the L series can be disassambled together with the seal casing, as all the rotating parts are pre-assembled in the removable end cover. This makes the screw pump particularly easy to assemble, dismantle and maintain.

KRAL L series use lifetime-lubricated, external ball bearings. FKM sealing discs with high temperature stability prevent wash out. This increases the life of the bearing and reduces maintenance costs.

The innovative one-piece casing design guarantees that pressure-side leakages are a thing of the past.

Your advantages.

High efficiency.
Gentle on the media even at high speeds.
Low wear, easy maintenance.
Approved on board ships.
Low maintenance costs.
Top and inline flange for every size.
Max. pressure: 63 bar.
Temperature with magnetic coupling up to 300 °C.
Viscosity of 7,000 mm²/s.
Used in KRAL single pump stations and KRAL dual stations.

Technical data		5-10	15-26	32-54	55-85
Qth (1450 min^-1, 0 bar)	l/min	5-10	15-26	32-54	55-85

Max. pressure at pressure flange	bar	63	63	63	63

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.		1.1	1.1	1.1	1.1
max.		7,000	7,000	7,000	7,000

Max. pressure at suction flange	bar
with radial sealing ring		1.5	1.5	1.5	1.5
with mechanical seal standard		6	6	6	6
with mechanical seal hard material		10	10	10	10
with balanced mechanical seal model LFI/LFT/LFW/LVI/LVT model LFM		20 6	20 6	20 6	20 6
with magnetic coupling model LFI/LFT/LFW/LVI/LVT model LFM		20 6	20 6	20 6	20 6

LFI flange screw pump.

Search result product LFI screw pump diesel horizontal

Universal pump for horizontal installation.

LFT screw pump.

Screw pump lft horizontal our middle pressure pump

For horizontal installation.

LVI pedestal screw pump.

The right choice if the installation area is narrow or if there is not enough space available.

LVT pedestal screw pump.

Space saving pump for vertical installation.

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Operation, materials, components.

L series screw pumps in the KRAL serial program.

Find out more

Easy servicing.

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

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