GSZ | 3-phase / 50Hz

Three-phase drainage pumps, designed to pump large volumes of water. The spiral shape of the pump casing, an air & water channel around the motor & the air-release valve, all combine to provide smooth, anti-clog pumping.

Technical Data

  • Discharge bore mm: 250 (mm)
  • Head max. m: 38,0 - 52,0
  • Capacity max. l/min: 12500 - 17500
  • Motor output kW: 75,0
  • Max. solid handling ø mm: 25
Performance curve

Model Colour code curve Discharge bore mm Motor output kW Head max. m Capacity max. l/min Max. solid handling ø mm
GSZ2-75-4 250 (mm) 75,0 52,0 12500 25
GSZ2-75-4L 250 (mm) 75,0 38,0 17500 25

Discharge bore mm 250 (mm)
Motor output kW 75,0
Head max. m 52,0
Capacity max. l/min 12500
Max. solid handling ø mm 25

Discharge bore mm 250 (mm)
Motor output kW 75,0
Head max. m 38,0
Capacity max. l/min 17500
Max. solid handling ø mm 25
ø Discharge bore mm 250
Discharge Connection JIS 10K Flange
Impeller Closed type impeller
Shaft Seal Double mechanical seal
Bearings Shielded ball bearings
Impeller Stainless steel casting DIN X5CrNi18-10, Chromium iron casting
Casing Grey iron casting EN-GJL-200
Shaft Seal Silicon carbide in oil bath
Pumping Fluid
Type of Fluid Spring water, Rain water, Ground water, Sand carrying water
Temperature 0-40°C
Type, Poles Induction motor, 4 poles, IP68
Insulation Insulation class E
Phase / Voltage 3-phase / 400V / 50Hz / s.d.
Motor Protector (built-in) Miniature protector
Lubrication Turbine oil (ISO VG32)
Casing Grey iron casting EN-GJL-200
Shaft Stainless steel EN-X30Cr13
Cable Rubber, NSSHÖU
Dimensions in mm:
W1: lowest running water level
  • GSZ2-75-4
  • GSZ2-75-4L

The GSZ-series is a submersible three-phase cast iron high head and high volume heavy-duty drainage pump driven by a 4-pole motor. The side discharge, spiral design allows smoother passage of the sucked solid matters. The motor is cooled by a water jacket that assures efficient motor cooling even when it operates with its motor exposed to air. The pump incorporates seal pressure relief ports that prevent the pumping pressure from applying to the shaft seal.

Case studies


Open Pit Mining

A large open pit coal mine used to install dewatering pumps from European manufacturers and had issues with pumping water during heavy rain events and snow season when the water became mudy and loaded with solids. When the water became loaded with abrasive material a lot of problems started.

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