In a typical building water supply system, demand fluctuates dramatically throughout the day. Morning peak hours, midday lulls, evening surges, and overnight lows create a demand profile that no fixed-speed pump can efficiently serve. Running at full capacity around the clock wastes energy, increases wear, and shortens equipment life.
The HNGE pump from Anhui Hongjiu eliminates this waste entirely. By combining the proven HNG hydraulic platform with a factory-integrated Inovance variable frequency drive and a YE3 premium-efficiency motor, the HNGE automatically matches pump speed to real-time demand — maintaining rock-steady outlet pressure without any manual intervention.
How the VFD Horizontal Pump Reduces Your Energy Bill by Up to 30%
The energy savings are not theoretical — they are governed by the pump affinity laws. Pump power consumption is proportional to the cube of speed (P ∝ n³). Reducing pump speed by just 20% cuts energy consumption by approximately 50%. The HNGE exploits this relationship continuously, adjusting motor frequency in real time to deliver exactly the pressure and flow your system needs — nothing more.
Consider a typical scenario: a DN100 pump serving a commercial building with a design flow of 100 m³/h and 40m head, operating 12 hours per day with a 60% average load factor.
| Parameter | Fixed-Speed Pump | HNGE VFD Horizontal Pump |
|---|---|---|
| Rated Motor Power | 18.5 kW | 18.5 kW |
| Average Power Consumption | 18.5 kW (constant) | ~11.5 kW (variable) |
| Daily Energy Consumption | 222 kWh | 138 kWh |
| Annual Energy (365 days) | 81,030 kWh | 50,370 kWh |
| Annual Savings | — | 30,660 kWh |
At typical industrial electricity rates, that translates to thousands of dollars saved every year — with a payback period that often falls between 1 and 2 years for the VFD upgrade investment.
Core Specifications
| Parameter | Specification |
|---|---|
| Flow Rate | 5–650 m³/h |
| Head | 5–54 m |
| Nominal Diameter | DN40–DN300 |
| Working Pressure | 1.6 MPa standard, 2.5 MPa optional |
| Temperature Range | -15 °C to +110 °C |
| Motor | YE3 (IE3 premium efficiency) |
| VFD Brand | Inovance (3 kW and above) |
| Control Mode | PID constant pressure, stepless speed regulation |
| Body Material | Ductile iron with electrophoretic coating |
| Bearings | NSK / SKF sealed, maintenance-free |
For detailed performance curves, wiring diagrams, and dimension drawings for all 10 frame sizes, Request the HNGE VFD Technical Catalog.
Intelligent Control That Runs Itself
Automatic Constant Pressure Regulation
The HNGE’s built-in PID controller continuously monitors system pressure via a feedback signal from a pressure transducer. It calculates the deviation between actual and target pressure, then adjusts motor frequency to eliminate the error in real time. This closed-loop control maintains steady outlet pressure across the full flow range — from peak demand to near-zero flow.
Stepless Speed Adjustment
Unlike traditional multi-speed or staged control systems, the HNGE provides infinitely variable speed adjustment. The VFD smoothly ramps motor speed up or down in response to demand changes, eliminating the pressure spikes, water hammer, and energy waste associated with fixed-speed or stepped control strategies.
Auto Standby Mode
When water demand drops below a configurable threshold — during nighttime hours or low-occupancy periods, for example — the HNGE automatically enters standby mode and stops the pump to conserve energy. When demand recovers, the pump restarts and ramps to the required speed without any operator action required.
Water Shortage Protection
An integrated water shortage detection function monitors suction conditions continuously. If the water level in the source tank drops below a safe level, the VFD triggers an alarm and stops the pump to prevent costly dry-running damage — a critical safeguard for applications with limited or variable water supply.
Comprehensive Motor Protection Suite
The HNGE VFD horizontal pump provides a full suite of protection functions that safeguard both the motor and pump investment:
- Over-current protection — Trips the VFD if motor current exceeds safe limits, preventing winding overheating
- Over-voltage and under-voltage protection — Shuts down if supply voltage deviates from acceptable thresholds
- Phase-loss protection — Detects missing phase in three-phase supply and prevents motor operation
- Over-temperature protection — Monitors motor temperature via the VFD thermal model
- Short-circuit and ground fault protection — Fast-acting electronic trip on output faults
- Dry-run protection — Power and current based detection prevents operation without liquid
These protection features eliminate the need for separate motor protection devices, simplify installation, and reduce panel space requirements.
Where the HNGE VFD Horizontal Pump Delivers Maximum Value
District Heating and Cooling Systems
District energy networks face demand that varies with outdoor temperature, building occupancy, and time of day. The HNGE automatically adjusts circulation flow to match actual thermal demand, eliminating the energy waste of constant-speed operation. Weather-compensated control can be integrated directly through the VFD’s programmable inputs.
Building Water Supply
High-rise residential towers, hotels, shopping malls, hospitals, and schools all experience highly variable water demand throughout the day. The HNGE maintains constant pressure at every tap — even during peak morning and evening usage — while consuming only the energy that the system actually needs.
Industrial Process Cooling
Manufacturing plants with variable thermal loads — plastic injection molding, food processing, pharmaceutical production — benefit from the HNGE’s ability to modulate cooling water flow precisely. The result is more consistent process temperatures, reduced product variability, and lower energy costs.
Municipal Booster Stations
Communities with varying consumption patterns rely on the HNGE to maintain consistent distribution pressure without over-pumping. Auto standby mode ensures zero energy waste during low-demand overnight hours.
Proven Reliability Backed by Factory-Direct Support
Every HNGE unit is factory-assembled and tested as a complete system — pump, motor, and VFD controller are matched, calibrated, and verified together before shipment. This integrated approach eliminates the compatibility issues and commissioning delays that often occur when VFDs are field-installed as aftermarket accessories.
The Inovance VFD selected for the HNGE is manufactured by China’s leading VFD company, with a proven track record in demanding industrial applications worldwide. Combined with Anhui Hongjiu’s ductile iron construction, electrophoretic coating, and NSK/SKF sealed bearings, the HNGE is built for years of reliable, low-maintenance operation.
Factory-direct pricing from Anhui Hongjiu saves you 20–30% compared to comparable imported alternatives — without compromising quality, performance, or after-sales support.
Ready to Stop Wasting Energy?
Our engineering team will analyze your system demand profile, recommend the optimal model and VFD configuration, and provide a detailed savings projection for your specific application.
Request a Quote — Receive a customized proposal with energy savings analysis within 24 hours.
View Full HNG Series — Compare all three HNG configurations to find the ideal solution.
For technical inquiries, contact us at info@hjwaterpump.com.
