Product Overview
QHYB-LG Variable Frequency Automatic Water Supply System is an integrated constant-pressure booster system based on LG vertical multistage centrifugal pumps, combined with variable frequency drive control, pressure sensors, and PLC intelligent control cabinet for fully automatic water supply regulation.
It addresses unstable pressure output during variable demand conditions, inefficient energy consumption under fixed-speed operation, and frequent manual intervention in traditional pump systems.
It is suitable for residential buildings, commercial complexes, municipal water supply networks, and industrial clean water distribution systems requiring automated pressure control.
Model Designation
Applications
• High-rise building domestic water supply automation systems
• Residential community unattended pump stations
• Commercial building water distribution networks
• Municipal secondary water supply systems
• Industrial clean water constant-pressure distribution
Engineering Advantages
• Multi-pump automatic switching ensures continuous operation under variable load conditions
• LG vertical multistage pump hydraulic structure provides high efficiency and stable head performance
• Variable frequency control reduces energy consumption during low-demand operation
• Closed-loop pressure feedback system maintains precise outlet pressure stability
• Intelligent PLC logic enables unattended automatic operation
System Components
QHYB-LG Variable Frequency Automatic Water Supply System mainly includes:
• LG vertical multistage centrifugal pump units
• Variable frequency drive (VFD) control system
• PLC intelligent control cabinet
• Pressure sensor feedback module
• Stainless steel inlet/outlet manifold
• Check valves and isolation valves
• Base frame and vibration damping system
Technical Parameters
Service Conditions
Clean water without solid particles or fibers
Non-corrosive or mildly corrosive liquid media
Indoor pump room installation
Operating Conditions
- Flow rate: 5 – 250 m³/h
- Head: 20 – 200 m
- Power range: 1.5 – 90 kW
- Speed: 2900 rpm
- Liquid temperature: ≤ 80°C
- Working pressure: ≤ 1.6 MPa
Detailed parameter tables are provided below.
Performance Parameters
| Applicable Buildings | Sprinkler Flow (L/s) | Sprinkler Operating Pressure (MPa) | Applicable Building Height (m) | Recommended Water Supply System Model (Vertical Pump Set) | ||
| Building Type | Design Sprinkler Density (L/(min·m²)) | Coverage Area (m²) | ||||
| Industrial Building | 10 | 300 | 60 | 0.1 | ≤12 | QHYB60-0.24-150LG-3 |
| Industrial Building | 10 | 300 | 60 | 0.1 | ≤24 | QHYB60-0.4-150LG-3 |
| Industrial Building | 10 | 300 | 60 | 0.1 | ≤36 | QHYB60-0.6-150LG-3 |
| Industrial Building | 10 | 300 | 60 | 0.1 | ≤50 | QHYB60-0.8-150LG-3 |
| Industrial Building | 10 | 300 | 60 | 0.1 | ≤72 | QHYB60-1.0-150LG-3 |
| Industrial Building | 10 | 300 | 60 | 0.1 | ≤100 | QHYB60-1.2-150LG-3 |
| Storage Building | 15 | 300 | 90 | 0.1 | ≤12 | QHYB90-0.24-150LG-3 |
| Storage Building | 15 | 300 | 90 | 0.1 | ≤24 | QHYB90-0.4-150LG-3 |
| Storage Building | 15 | 300 | 90 | 0.1 | ≤36 | QHYB90-0.6-150LG-3 |
| Storage Building | 15 | 300 | 90 | 0.1 | ≤50 | QHYB90-0.8-150LG-3 |
| Storage Building | 15 | 300 | 90 | 0.1 | ≤72 | QHYB90-1.0-150LG-3 |
| Storage Building | 15 | 300 | 90 | 0.1 | ≤100 | QHYB90-1.2-150LG-3 |
| Ordinary Hazard | 6 | 300 | 40 | 0.1 | ≤12 | QHYB40-0.24-100LG-3 |
| Ordinary Hazard | 6 | 300 | 40 | 0.1 | ≤24 | QHYB40-0.4-100LG-3 |
| Ordinary Hazard | 6 | 300 | 40 | 0.1 | ≤36 | QHYB40-0.6-100LG-3 |
| Ordinary Hazard | 6 | 300 | 40 | 0.1 | ≤50 | QHYB40-0.8-100LG-3 |
| Ordinary Hazard | 6 | 300 | 40 | 0.1 | ≤72 | QHYB40-1.0-100LG-3 |
| Ordinary Hazard | 6 | 300 | 40 | 0.1 | ≤100 | QHYB40-1.2-100LG-3 |
| Light Hazard | 3 | 300 | 15 | 0.1 | ≤12 | QHYB15-0.24-50LG-3 |
| Light Hazard | 3 | 300 | 15 | 0.1 | ≤24 | QHYB15-0.4-50LG-3 |
| Light Hazard | 3 | 300 | 15 | 0.1 | ≤36 | QHYB15-0.6-50LG-3 |
| Light Hazard | 3 | 300 | 15 | 0.1 | ≤50 | QHYB15-0.8-50LG-3 |
| Light Hazard | 3 | 300 | 15 | 0.1 | ≤72 | QHYB15-1.0-50LG-3 |
| Light Hazard | 3 | 300 | 15 | 0.1 | ≤100 | QHYB15-1.2-50LG-3 |
| Users can select the appropriate model according to the parameters provided. | ||||||
How to Select a Pump Model
• Determine peak flow demand and daily water consumption pattern
• Calculate total head including elevation and pipeline resistance loss
• Define system redundancy requirements (single / multi pump configuration)
• Select control mode based on automation level requirement
• Confirm electrical supply and system integration requirements
Engineering Notes
• Pressure sensor installation position directly affects system control accuracy
• Pump operation should remain within high-efficiency hydraulic range
• Excessive start-stop cycles should be avoided in automatic systems
• NPSH conditions must be satisfied to prevent cavitation
Compliance & Quality Assurance
• Factory hydraulic performance testing for each pump unit
• PLC control system functional verification before shipment
• Electrical insulation and grounding inspection
• Material traceability for wetted components
• Optional third-party inspection available
Safety Notice
• Do not operate under dry-running condition
• Ensure stable inlet water supply before startup
• Do not exceed rated working pressure
• Disconnect power before maintenance
OEM & Customization
This system supports engineered configuration and duty-based matching. Technical adjustments can be made according to system requirements and installation conditions.
Available options include:
• Pump quantity and cascade arrangement
• Motor voltage & frequency
• Control logic customization (PLC programming)
• Pressure tank integration
• Material selection for wetted parts
Configuration is determined based on duty point and project specifications.
FAQs
Q: Can the system operate fully automatically without manual intervention?
A: Yes, PLC-based control enables unattended automatic operation.
Q: What is the maximum working pressure?
A: ≤ 1.6 MPa depending on configuration.
Q: Can multiple pumps operate alternately?
A: Yes, automatic cascade switching is supported.
Q: Is energy consumption reduced under partial load?
A: Yes, VFD significantly reduces power consumption.
Q: What pump type is used in this system?
A: LG vertical multistage centrifugal pumps.
Q: Can it integrate with building automation systems?
A: Yes, communication interfaces are available.