The Grundfos NB40-125 Series is a versatile close-coupled end-suction pump range designed for medium to high flow demands in clean water and light industrial applications. These non-self-priming, single-stage centrifugal pumps feature an axial suction port and radial discharge port with a horizontal shaft, providing smooth, energy-efficient liquid handling for a wide range of installations.

Built with robust hydraulics and a dynamically balanced impeller, the NB40-125 delivers stable performance with low vibration and minimal wear, ensuring long service life. The pump’s heavy-duty cast iron housing and corrosion-resistant internal wear parts provide excellent durability and resistance against slightly contaminated liquids that do not contain abrasive solids.

Each pump is directly coupled to an IEC-flanged three-phase AC motor running at 2900 RPM, delivering consistent flow rates up to 1000 LPM and heads up to 28 metres (280 kPa). A reliable O-ring seal between the pump housing and cover guarantees leak-free operation and secure system performance.

With its compact, close-coupled design, the NB40-125 is easy to install and maintain, making it ideal for domestic and commercial water supply, industrial pressure boosting, HVAC and cooling water circulation, irrigation, and general-purpose fluid transfer tasks.

FEATURES

• Non-self-priming, single-stage, close-coupled centrifugal pump
• Axial suction and radial discharge configuration for efficient flow handling
• Hydraulically and dynamically balanced impeller for stable, smooth operation
• Rugged cast iron pump housing with corrosion-resistant wear parts
• O-ring seal for safe, leak-free performance
• Direct coupled IEC flanged three-phase AC motor (2900 RPM)
• DN65 inlet / DN40 outlet with PN16 flanged connections
• Flow capacity up to 1000 LPM and heads up to 28 metres (280 kPa)
• Ideal for water supply, HVAC, industrial boosting, cooling water circulation and irrigation