MK

Summary

Product identification

The KSB MK series comprises drainage, waste water, condensate, and heat transfer fluid pumps.

Variants:

• MK, MKA: For drainage and condensate return from non-pressurised tanks.
• MKY: For condensate return, heating, and heat transfer systems.
• MK-B, MKA-B: Variants with tin bronze casing/impeller.
• MK-C, MKA-C: Variants with chrome nickel molybdenum cast steel casing/impeller.

Design:

• Volute casing
• Vertical installation
• Rigid connection between pump and motor
• Single-stage
• Impeller type: Three-channel impeller, suitable for fluids containing solids up to 18 mm.
• Pipe connection: Rp 2
• Installation depths: 100 cm, 190 cm, 280 cm

Operating limits

• Flow rate (Q): 2 - 36 m³/h (0.56 - 10 l/s)
• Head (H): ≤ 19 m
• Fluid temperature (T): ≥ -10 °C
  • MK, MKA: ≤ +90 °C (up to 80 °C for versions with acrylonitrile butadiene rubber bearing bush or temperature class T5 in accordance with ISO 80079-36 (EN 13463-1))
  • MKY: ≤ +200 °C (for water up to 110 °C)
• Explosion protection:
  • MK, MKA: Available; requires one of the optional lubrication types for the bearing bush.
  • MKY: Not available.

Fluids handled

• MK, MKA: Grey water, Oil, Emulsions, Aggressive fluids, Condensate.
• MKY: Condensate, Heat transfer fluids below boiling point.
• Solids handling: Up to 18 mm.

Electrical

• Drive: KSB surface-cooled IEC three-phase current squirrel-cage motor.
• Voltage: 230/400 V
• Type of construction: IM V1
• Enclosure: IP55
• Explosion-proof pump sets: Motors are supplied in Ex eb IIB / Ex db eb IIC type of protection.
• Motors (Standard design V1, 400 V, 50 Hz, IP55):
  • Sizes: 80M, 90S, 90L
  • Number of poles: 2 or 4
  • Efficiency classes: IE1, IE3
  • Power (P2): 0.55 kW, 0.75 kW, 1.10 kW, 1.50 kW, 2.20 kW
  • Current (I): 1.5 A, 1.66 A, 1.75 A, 2.14 A, 2.25 A, 2.85 A, 3.00 A, 3.99 A, 4.20 A
  • Motors for operation in potentially explosive atmospheres can also be ordered from KSB.

Mechanical / hydraulic

• Shaft seal:
  • MK, MKA: Vapour barrier
  • MKY: Gland packing
• Bearings:
  • Drive end: Radial ball bearing, greased for life.
  • Impeller end: Bearing bush, product-lubricated.
  • Optional impeller end lubrication: Internal lubrication by fluid handled, grease lubrication, lubrication by external fluid.
• Materials:
  • Casing/Impeller:
    • MK, MKA, MKY: Grey cast iron
    • MK-B, MKA-B: Tin bronze
    • MK-C, MKA-C: Chrome nickel molybdenum cast steel
  • Shaft/Coupling:
    • MK, MKY: Chrome steel
    • MK-B, MKA-B, MK-C, MKA-C: Chrome nickel molybdenum steel
  • Discharge pipe:
    • MK, MKA: Galvanised steel
    • MK-B, MKA-B, MK-C, MKA-C: Chrome nickel molybdenum steel
    • MKY: Steel
• Weights (without motor):
  • MK: 34 kg to 68 kg
  • MKA: 62 kg to 104 kg
  • MK-B: 40 kg to 79 kg
  • MKA-B: 71 kg to 117 kg
  • MK-C: 37 kg to 73 kg
  • MKA-C: 67 kg to 111 kg
  • MKY: 71 kg to 114 kg
  • See the official PDF for exact tabulated values for each variant and installation depth.
• Dimensions:
  • Detailed dimension drawings and tables are available for MK/MKA and MKY variants, including installation depth (ET) and minimum fluid level (WT).
  • See the official PDF for detailed dimension drawings and tables.

Accessories

• Lubrication equipment (optional):
  • Internal lubrication by fluid handled
  • Lubrication by external fluid
  • Grease lubrication device
• Pump accessories:
  • RK swing check valve (Plastic, Rp 2)
  • Swing check valve (Gunmetal, Rp 2, max. 225 °C)
  • Socket gate valve (CuZn PN 10-12 DIN 3352, Rp 2)
• Float switch:
  • Magnetic float switch arrangement (MS 100, MSA 100, MS 190, MSA 190)
  • Float switch with free cable end (polypropylene housing, max. fluid temperature 70 °C), available with 5 m, 10 m, or 20 m cable.
• Control units and switchgear:
  • Motor protection switchgear MSD (for 0.55 kW, 0.75 kW, 1.10 kW, 1.50 kW, 2.20 kW motors).
  • LevelControl Basic 2 control unit for single-pump station (BC1, BS1 models).
  • LevelControl Basic 2 control unit for dual-pump station (BC2, BS2 models).
• Alarm switchgears (without ATEX):
  • AS 0, AS 1, AS 2, AS 4, AS 5 (various features including acoustic signals, volt-free contacts, self-charging power supply units).
• LevelControl Basic 2 accessories:
  • Master switch (3-pole, 20 A, lockable)
  • Outdoor cabinet type 142 (internal dimensions H × W × D: 600 × 276 × 165 mm)
  • Rechargeable battery retrofit kit (2 rechargeable batteries 6 V, 1.3 Ah, and charging unit)
  • Signalling module
• Control unit/switchgear accessories:
  • F1 leakage sensor (max. 40 °C, not suitable for steam and condensate)
  • Horn (12 V DC, 105 dB, 150 mA, IP54)
  • Alarm combination (yellow alarm strobe light and piezo buzzer 92 dB, 12 V DC, 120 mA, IP65)
  • Yellow alarm strobe light (12 V DC, 195 mA, IP65)
  • Plastic housing (IP65) for alarm strobe light

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Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the complete OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror