The Grundfos NB50-125 Series is a versatile close-coupled end-suction centrifugal pump range designed for larger flow requirements in commercial and industrial liquid transfer applications. These non-self-priming, single-stage pumps feature an axial suction port and radial discharge port in a horizontal shaft configuration that ensures smooth, efficient liquid handling with minimal flow resistance.

Built with robust pump hydraulics and a hydraulically and dynamically balanced impeller, the NB50-125 delivers stable, low-vibration operation for reliable long-term performance. The rugged cast iron pump housing combined with corrosion-resistant internal wear parts ensures dependable service when handling thin, clean or slightly contaminated liquids without abrasive or fibrous solids.

Each pump in the NB50-125 Series is directly coupled to an IEC-flanged three-phase AC motor operating at 2900 RPM, providing flow rates up to 1700 LPM and heads up to 28 metres (280 kPa). A secure O-ring seal between the pump housing and cover ensures leak-free operation and reliable system performance.

Thanks to its space-saving close-coupled design and straightforward maintenance, the NB50-125 Series is an ideal choice for high-volume water supply, industrial pressure boosting, HVAC circulation, cooling systems, and irrigation applications where robust performance and dependable flow are essential.

FEATURES

• Non-self-priming, single-stage, close-coupled centrifugal pump
• Axial suction and radial discharge design for optimised liquid flow
• Hydraulically and dynamically balanced impeller for smooth, stable operation
• Heavy-duty cast iron pump housing with corrosion-resistant wear parts
• O-ring seal for secure, leak-free performance
• Direct coupled IEC flanged three-phase AC motor (2900 RPM)
• DN80 inlet / DN50 outlet with PN16 flanged connections
• Handles flow up to 1700 LPM and heads up to 28 metres (280 kPa)
• Ideal for high-volume water supply, industrial boosting, cooling, HVAC and irrigation