Radial shaft seal ringRadial shaft seal ringThe CK series screw pump is only available with a radial shaft seal ring. The CL series screw pump can be equipped with different shaft sealing options thanks to the longer screw set. External bearings are also possible. This pump line is used as a horizontal or vertical foot-mounted or flange-mounted pump as well as in in-tank vertical arrangements.
Longer screw setLonger screw setThanks to the longer spindle an external ball bearing is optionally offered.
Seal housingSeal housingDepending on the operational requirements various shaft seal options are possible for the CL series. The CL series screw pump is the cartridge (insert) pump of the CG series. The various housing options allow enormous flexibility in terms of the liquid connections. An external overflow valve can optionally be attached to the CG series screw pumps.
Flexible connectionsFlexible connectionsIf the outer casing is made from fabricated steel, then almost any positioning, direction, size, type and rating of flange can be achieved. It can be ideally suited to match the installation situation.
External overflow valveExternal overflow valveThe overflow valve ensures that the liquid is rerouted should excess pressurization occur.
Housing variantsHousing variantsDepending on the operational requirements cast iron or steel housings are offered for the CG series.

KRAL C Series Screw Pumps

For pressures of up to 100 bar

The all-rounder – when needs exceed the KRAL K or L series
The main components of the KRAL C series are the same – the CK, CL and CG series screw pumps differ in the details, delivering the right pump to match more demanding applications. These pumps are primarily used in industry. The KRAL CK series is used in hydraulics as a tank pump. The KRAL CL series is put to use in the plastics industry as a high pressure feeder pump for polyurethane components like polyols and isocyanates. KRAL CG series are utilized in all the same areas of industry as the KRAL K and L series when higher pressures and delivery rates are required.

Operation, materials, components

  • Delivery rate CK: 1,750 l/min
  • Delivery rate CL: 1,750 l/min
  • Delivery rate CG: 3,550 l/min
  • Temperature range: -20 °C to 180 °C, magnetic coupling to 300 °C
  • Pressure range: 70 bar; 100 bar
  • Housing: Nodular cast iron, steel and aluminium
  • Screws: Steel, nitrided
  • Certifications: ABS, BV, CCS, DNV, GL, LRS, MRS, NK, RINA, KR
  • ATEX: II 2 GD b/c group II, category 2
  • Heating: Electrical, fluid media and steam
  • Manufactured to conform with API

KRAL CK series

The mega seller of the C series

The KRAL CK series screw pump is very compact and the least expensive. Its short main screw and construction is achieved by using a shaft seal ring. The CK is often supplied with a suction pipe for vertical in-tank installation.

The KRAL CK series is the best-selling screw pump line of the C series. It is mainly used in hydraulic and lube oil applications. Standardized pump / motor brackets made of aluminum are used for the CK pump. This makes the pump simple to install and inexpensive.

Due to its short shaft, the CK series screw pump is only available with a radial shaft seal. The CK has internal bearings and is most often used as vertical, submerged in-tank pump.

 

Your advantages

  • Flow rates up to 880 l/min
  • Viscosity of 10,000 mm²/s
  • Pressure up to 100 bar
  • Simple to install
  • Inexpensive screw pump

KRAL CL series

Capable of higher pressures

The KRAL CL series screw pumps have a longer main screw. It is therefore capable of higher pressures and has sufficient space for a wide range of shaft seals. Thanks to the longer screw set, it can be equipped with different shaft sealing options. External bearings are also possible. The KRAL CL series is used as horizontal or vertical foot or flange mounted pump as well as in tank-vertical arrangements.

The KRAL CL series screw pump is the cartridge (insert) pump used in the KRAL CG series screw pumps.

 

Your advantages

  • Flow rates up to 880 l/min
  • Viscosity of 10,000 mm²/s
  • Pressure up to 100 bar
  • Capable of higher pressures
  • A wide range of shaft seals
  • Different shaft sealing options
  • External bearings are possible

KRAL CG series

Individual customization

The KRAL CG series screw pump is a cartridge pump (insert pump) design with a variety of options for safety or bypass valves. The outer casing is either cast iron or fabricated steel. The steel-cased version allows for almost any location, size and type of liquid connection.

With the CG series screw pumps, KRAL offers a variety of housings, relief valves and connections. The housing is available in cast iron or steel. Versions with heating jacket for high-viscosity liquids are available.

For the KRAL CG series, the KRAL CL series screw pump is used as the cartridge (insert) pump.

The various housing options allow enormous flexibility with regards to the liquid connections. An external overflow valve can be optionally attached to the CG series pumps.

Your advantages

  • Flow rates up to 3,550 l/min
  • Viscosity of 1,000,000 mm²/s
  • Pressure up to 100 bar
  • A variety of housings, relief valves and connections
  • Housing in cast iron or steel available
  • Heating jacket for high-viscosity liquids
  • For almost any location, size and type of liquid connection
  • External overflow valve can be optionally attached
  • Technical data

    CK series

    CK series

    Technical data CK5-1015-2632-4255-85105-118160-210235-275370-450550-880
    Qth (1.450 min-¹, 0 bar)l/min5-1015-2632-4255-85105-118160-210235-275370-450550-880
               
               
    Max. discharge pressurebar1007070707070707040
               
    Temperature°C         
    with radial shaft seal NBR
    with radial shaft seal FKM
     90
    150
    90
    150
    90
    150
    90
    150
    90
    150
    90
    150
    90
    150
    90
    150
    90
    150
               
    Viscositymm²/s         
    min. 1.11.11.11.11.11.11.41.41.4
    max. 10,00010,00010,00010,00010,00010,00010,00010,00010,000
               
    Max. pressure at suction flangebar         
    with radial shaft seal 1.51.51.51.51.51.51.51.51.5

    CL series

    CL series

    Technical data CL5-1015-2632-4255-85105-118160-210235-275370-450550-880
              
    Qth (1.450 min-¹, 0 bar)l/min5-1015-2632-4255-85105-118160-210235-275370-450550-880
               
    Max. discharge pressurebar1001001001001001001008080
               
    Temperature°C         
    with stuffing box packing 808080808080808080
    with radial shaft seal 909090909090909090
    with mechanical seal - standard 150150150150150150150150150
    with mechanical seal - hard material 180180180180180180180180180
    with magnetic coupling 300300300300300180180180180
               
    Viscositymm²/s         
    min. 1.11.11.11.11.11.11.11.11.1
    max. 10,00010,00010,00010,00010,00010,00010,00010,00010,000
               
    Max. pressure at suction flangebar         
    with stuffing box packing 333333333
    with radial shaft seal 666666666
    with mechanical seal - standard 666666666
    with mechanical seal - hard material 666666666
    with magnetic coupling 666666666

    CG series

    CG series

    Technical data CG15-2632-4255-85105-118160-210235-275
    Qth (1.450 min-¹, 0 bar)l/min15-2632-4255-85105-118160-210235-275
            
    Max. discharge pressurebar100100100100100100
            
    Temperature°C      
    with stuffing box packing 808080808080
    with radial shaft seal 909090909090
    with mechanical seal - standard 150150150150150150
    with mechanical seal - hard material 180180180180180180
    with magnetic coupling 300300300300300300
            
    Viscositymm²/s      
    min. 1.11.11.11.11.11.1
    max. 1,000,0001,000,0001,000,0001,000,0001,000,0001,000,000
            
    Max. pressure at suction flangebar      
    with stuffing box packing 333333
    with radial shaft seal 101010101010
    with mechanical seal - standard 666666
    with mechanical seal - hard material 101010101010
    with mechanical seal - balanced 303030303030
    with magnetic coupling 100100100100100100
    Technical data CG370-450550-880851-9511101-13011501-17012250-3550
    Qth (1.450 min-¹, 0 bar)l/min370-450550-880851-9511101-13011501-17012250-3550
            
    Max. discharge pressurebar100100100100100100
            
    Temperature°C      
    with stuffing box packing 8080----
    with radial shaft seal 909090909090
    with mechanical seal - standard 150150150150150150
    with mechanical seal - hard material 180180180180180180
    with magnetic coupling 300300300300300300
            
    Viscositymm²/s      
    min. 1.41.41.41.41.41.4
    max. 1,000,0001,000,0001,000,0001,000,0001,000,0001,000,000
            
    Max. pressure at suction flangebar      
    with stuffing box packing 33----
    with radial shaft seal 101010101010
    with mechanical seal - standard 666666
    with mechanical seal - hard material 101010101010
    with mechanical seal - balanced 303030303030
    with magnetic coupling 100100100100100100
  • Models
    Flange screw pump CGF

    The flange screw pump CGF is the universal pump for horizontal installation.

    Screw pump CGH

    Screw pump CGH – mounted onto base frames.

    CG pedestal screw pump

    Space saving CG pedestal screw pumps are for vertical installation.

    In-tank CK/CL screw pump

    CK/CL screw pumps are suitable for in-tank installation.

    CK/CL flange screw pump

    The CK/CL flange screw pump line – universal horizontal installation pumps.

  • Operating instructions
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