Single-stage, low-pressure centrifugal pump with axial suction, mounted on a baseplate.


  • Pumping of heating water (acc. to VDI 2035), cold water and water/glycol mixtures without abrasive substances in heating, cold water and cooling systems.
  • Applications for municipal water supply, irrigation, building services, general industry, power stations, etc.

Type key

Example NLG 200/315-75/4
NLG Series designation: Standard pump
200 Nominal diameter DN of pressure port
315 Nominal diameter of impeller [mm]
75 Rated motor power P2 [kW]
4 number of poles

Special features/product advantages

  • Reduced life cycle costs thanks to optimized efficiency
  • Bidirectional, force-flushed mechanical seal
  • Interchangeable casing wear rings
  • Permanently lubricated, generously dimensioned roller bearings
  • Low NPSH, best cavitation properties

Technical data

  • Minimum Efficiency Index (MEI) ≥ 0.4
  • Permissible temperature range -20°C to +120°C
  • Mains connection 3~400 V, 50 Hz
  • Protection class: IP55
  • Nominal diameter DN 150 to DN 300
  • Max. operating pressure 16 bar

Scope of delivery

  • Pump
  • Installation and operating instructions
  • Pump with free shaft end or
  • Pump on baseplate with coupling and coupling guard or
  • Completely mounted pump on baseplate with electric motor


  • Pump housing and pressure lid: EN-GJS-500-7
  • Bearing bracket: EN-GJL-250
  • Impeller: EN-GJL-250
    (special version: G-CuSn10)
  • Shaft: 1.4028
  • Stationary wear rings: G-CuSn10
  • Mechanical seal: AQ1EGG;
    (other mechanical seals on request)


  • Single-stage horizontal spiral housing pump with bearing bracket and exchangeable stationary wear rings in process design
  • Shaft seal using mechanical shaft seals in accordance with EN 12756 or packing stuffing box
  • Spiral housing with cast pump bases. Bearing of the pump shaft using greased grooved ball bearing
  • Shaft coupling with intermediate sleeve

General notes - ErP (ecological design-) directive

  • The benchmark for most efficient water pumps is MEI ≥ 0.70
  • The efficiency of a pump with a trimmed impeller is usually lower than that of a pump with the full impeller diameter. The trimming of the impeller will adapt the pump to a fixed duty point, leading to reduced energy consumption. The minimum efficiency index (MEI) is based on the full impeller diameter.
  • The operation of this water pump with variable duty points may be more efficient and economic when controlled, for example, by the use of a variable speed drive that matches the pump duty to the system.
  • Information on benchmark efficiency is available atwww.europump.org/efficiencycharts
  • Pumps with power consumption > 150 kW or a volume flow QBEP < 6 m3/h are not subject to the Ecodesign Directive for water pumps. Therefore, no MEI value is shown.