Grundfos NK/NKE Series: The Industry Standard for Long-Coupled End-Suction Performance
Engineering Efficiency into Every Flow
In modern hydronic and industrial systems, the pump is the engine driving your operational success. The Grundfos NK/NKE range is engineered to meet these challenges by delivering industry-leading efficiencies that exceed current regulations and prepare your facility for the future. By merging a heavy-duty, long-coupled design with revolutionary hydraulic innovation, we ensure your systems remain reliable, sustainable, and cost-effective.
Unmatched Reliability Meets Peak Efficiency
We don’t believe in compromising between high-performance output and long-term durability. The NK series offers:
NEMA Premium Efficiency: This standard ensures lower energy consumption, a faster ROI, and a more sustainable installation.
CFD Optimized Hydraulics: Advanced Computational Fluid Dynamics (CFD) ensures industry-leading wire-to-water efficiency.
Stainless-Steel Impellers: Precision-designed to increase efficiency while lowering the Net Positive Suction Head (NPSH) required.
Balanced Operation: Balanced impellers reduce noise and vibration, significantly prolonging the life of seals and bearings.
Dual-Volute Design: Larger models feature an internal dual-volute that lowers life-cycle costs and reduces wear on internal components.
Revolutionary Shaft Seal Technology
At the heart of the NK range is a robust Silicon Carbide/Silicon Carbide (SiC/SiC) hard-faced seal. This new design offers:
Extended Temperature Range: Handles liquids from -13°F to +248°F, with options reaching up to 284°F.
Abrasive Resistance: Engineered to handle grit and abrasives better than standard mechanical seals.
Alignment Integrity: The bearing bracket is produced in a single manufacturing process to eliminate misalignment, a common cause of seal failure.
Flexible Installation & Serviceability
Whether your facility requires a standard foundation or a specialized non-grouting setup, the NK series adapts to your infrastructure.
Back Pull-Out Design: This allows for the removal of the motor and impeller without disturbing the pump housing or the connected pipework.
Self-Venting Volute: The top centerline discharge design allows for natural self-venting and enables more compact piping layouts.
Sturdy Base Frame: The heavy-duty design ensures the pump and motor stay perfectly aligned over years of continuous operation.
Optional Spacer Coupling: Simplifies maintenance by allowing access to the mechanical seal and impeller without moving the motor.
Versatile Application Range
From large-scale climate control to municipal water transport, the NK series is built for diverse environments:
HVAC & District Energy: Ideal for primary heating and cooling loops in commercial and district systems.
Industrial Processes: Reliable performance for cooling water systems and process fluid distribution.
Water Utility: Engineered for the rigorous demands of water transport and municipal utility networks.
NK vs. NKE: Choosing Your Performance Tier
Grundfos NK: The "Workhorse." Ideal for fixed-speed applications in HVAC, district energy, and water utilities where rugged reliability is the primary requirement.
Grundfos NKE: The "Intelligent Powerhouse." Featuring an integrated frequency converter and high-efficiency MGE motor, the NKE series automatically adjusts to real-time system demands for maximum energy savings.
