Kral CK118.1126V Three-Screw Pump

Kral CK118.1126V Screw Pump

The KRAL CK118.1126V is a high-efficiency, positive displacement three-screw pump engineered specifically for harsh marine propulsion systems, power plant auxiliary loops, and high-pressure industrial lubrication packages. Designed with an ultra-compact footprint and internal media-lubricated bearing arrangement, this self-priming unit delivers continuous, non-pulsating volumetric displacement with zero hydraulic shear.

The CK118.1126V maintains volumetric integrity across shifting temperature and viscosity spectrums—handling clean light marine gas oil (DMA/DMZ), heavy residual fuel oil (HFO), low-sulfur blends (VLSFO), turbine lube oils, and hydraulic fluids.

Model Details:

• Model Series: KRAL C Series (Compact CK Sub-Line)
• Model Code: CK118.1126V
• Manufacturer Part Number (MPN): CK118.1126V (Variants: CK-118-1126V / CK 118-1126-V)
• Pumping Principle: Rotary positive displacement, triple-screw (1 drive screw / power rotor intermeshed with 2 counter-rotating idler sealing screws).
• Hydraulic Profile: Hydraulically balanced spindle array with integral axial thrust compensation to eliminate mechanical bearing thrust load during deep differential pressures.

Material Build & Mechanical Sealing

• Pump Body / Casing: Nodular Cast Iron (EN-GJS-400 / GGG-40) standard, pressure-rated for marine engine rooms.
• Rotors / Spindles: High-grade alloy steel, plasma/gas nitration-hardened for superior resistance against scuffing, micro-abrasives, and boundary lubrication breakdown.
• Internal Bearings: Hydrodynamic sleeve/journal friction bearings lubricated directly by the pumped liquid medium.
• Shaft Sealing Execution (Suffix “V”): High-specification Fluorocarbon (FKM / Viton®) elastomeric rotary shaft lip seal with an integrated fluid relief weep port to protect motor face interfaces and prevent external containment compromise.

Compatibility

• Two-Stroke & Four-Stroke Marine Diesel Engines: Compatible with auxiliary booster, camshaft lubrication, and governor oil circuits for MAN Energy Solutions (e.g., 5L16/24, 6L21/31, 7L23/30, 28/32H series), Wärtsilä (Vasa 32, W20, W26, W32, W38), and Daihatsu / Yanmar auxiliary engines.
• Marine Separator & Fuel Boost Modules: Used as feed and transfer displacement units within Alfa Laval, GEA Westfalia, and Kanagawa fuel conditioning and purifier feed skids.
• Marine Gearboxes & Thrusters: Main propulsion reduction gear lubrication packages for Renk, Reintjes, Flender, and Brunvoll tunnel/azimuth thrusters.
• Industrial Applications: Gas turbine fuel injection feed, hydraulic elevator power units, machine tool hydrostatic clamping systems, and continuous oil recycling loops.

Part Number Cross-References

• KRAL OEM Part Numbers: CK118.1126V, CK-118-1126V, CK1181126V, CK 118.1126.V
• Equivalent / Alternative Footprint Crosses:
  • KRAL Series: KF-118 / K-118 (verify mounting bracket depth and shaft center line).
  • IMO Pump Interchange: Consult our engineering team for port adapter flanges to swap with IMO ACD 025 or ACE 032 series.
  • Allweiler Interchange: Compatible performance envelope alternative to Allweiler SPF10 / SPF20 and TRILUB 3-screw designs.

Frequently Asked Questions

What does the “V” denote in the Kral CK118.1126V model code?

The “V” designation indicates that the pump is factory-fitted with high-temperature FKM (Fluorocarbon / Viton®) elastomeric seals. This enables the unit to operate reliably at fluid temperatures up to 150 °C (302 °F), making it suitable for pre-heated Heavy Fuel Oil (HFO) and thermal oil circuits compared to standard NBR seals.

Can the Kral CK118.1126V be mounted vertically inside a tank?

Yes. The compact CK configuration with internal media-lubricated bearings is suitable for vertical submerged tank installations as well as dry external bracket mounting. When mounted vertically, ensure the suction opening is located sufficiently below minimum fluid levels to avoid vortexing and air ingress.

What is the difference between KRAL CK and CL series pumps?

The CK series is engineered with a shorter main screw and internal bearings, utilizing a compact radial shaft seal ring. This gives the CK a shorter overall length and lower weight, optimal for space-constrained skids. The CL series features a longer shaft configuration capable of housing mechanical seals, external ball bearings, or magnetic couplings.

Can this pump handle low-viscosity Marine Gas Oil (MGO)?

Yes, down to 1.5 mm²/s (cSt). However, when operating continuously at ultra-low viscosities (typical of low-sulfur distillate compliance fuels), maximum allowable differential pressure must be derated to maintain the hydrodynamic lubricating boundary layer across internal surfaces.

How do I reverse the flow direction on a Kral CK three-screw pump?

Kral screw pumps are fundamentally unidirectional. Reversing the electric motor rotation will not reverse flow cleanly and will starve internal bearing surfaces, causing instantaneous mechanical failure. Direction of rotation is fixed Clockwise (CW) when facing the pump drive shaft.