Armstrong 4380 10HP Close Coupled Vertical In-Line Pump 4x4x6

Armstrong 4380 Close Coupled VIL Pump 10 HP

The Armstrong Series 4380 (4x4x6) is a high-efficiency Close Coupled Vertical In-Line pump engineered to facilitate consistent fluid circulation in mid-sized commercial hydronic systems. The close-coupled design integrates the pump and motor into a single, compact unit where the impeller is mounted directly on the motor shaft extension, neutralizing the need for a separate coupling and alignment. This mechanical configuration optimizes space utilization and maintains structural integrity, ensuring reliable performance in secondary heating and cooling loops where a small footprint is a primary requirement.

Featuring a robust 10 HP NEMA-standard motor, the 4380 executes precise torque delivery to maintain constant flow rates at 1750 or 3500 RPM configurations. The integrated mechanical seal is engineered to sustain vacuum-tight integrity up to 250°F, protecting the motor from fluid ingress and thermal stress. By leveraging permanently lubricated motor bearings and a simplified drive system, this configuration minimizes mechanical vibration and stabilizes rotational frequency, significantly extending the mean time between failures in continuous-duty service.

Key Features of Armstrong 4380 10 HP

• Powerful 10 HP motor for reliable commercial flow
• Durable 4x4x6 close-coupled VIL configuration
• Space-saving design eliminates need for baseplates
• Superior mechanical seal resists 250F heat
• High-efficiency impeller optimizes hydraulic performance
• Practical in-line mounting reduces installation costs
• Versatile application for HVAC and pressure boosting