Product Overview
QHYB / LG Variable Frequency Water Supply Equipment
QHYB / LG Variable Frequency Water Supply Equipment is a constant pressure water supply system integrating pumps, frequency converters, pressure sensors, and control cabinets for automated water supply regulation.
It addresses unstable water pressure, energy waste, and manual pump control limitations in traditional water supply systems.
It is suitable for residential buildings, commercial complexes, industrial water systems, and municipal secondary water supply networks.
Model Designation
Applications
Typical Operating Scenarios
- High-rise residential constant pressure water supply
- Commercial building water distribution systems
- Industrial production water supply networks
- Municipal secondary pressurization stations
- Hotel and hospital water supply systems
Engineering Advantages
Structural Design Logic & Engineering Results
• Variable frequency control adjusts pump speed in real time → Maintains stable outlet pressure under varying demand
• Multi-pump parallel operation system → Ensures redundancy and energy optimization
• Pressure sensor feedback loop → Enables fully automatic closed-loop control
• Soft start and soft stop function → Reduces hydraulic shock and extends system life
System Components
QHYB / LG Variable Frequency Water Supply Equipment：
- Water supply pump unit
- Variable frequency control cabinet
- Pressure sensors
- Pipeline system
- Check valves
- Flow control valves
- Base frame
Technical Specifications
Service Conditions
Clean water or similar non-corrosive liquids
No solid particles or fibers
Continuous automatic water supply operation
Operating Conditions
- Flow rate: 5 – 500 m³/h
- Head: 10 – 200 m
- Power range: 2.2 – 250 kW
- Control accuracy: ±0.01 MPa
- System pressure: ≤ 2.5 MPa
- Power supply: 380V / 50Hz
Detailed parameter tables are provided below.
Performance Parameters
| Applicable Building |
Sprinkler flow rate
(L/s) |
Operating pressure
at sprinkler head (MPa) |
Applicable building height
(m) |
Recommended packaged water supply model
Vertical pump set |
||
| Building type |
Design density
(L/min·m²) |
Coverage area
(m²) |
||||
| Production building | 10 | 300 | 60 | 0.1 | ≤12 | QHYB60-0.24-150LG-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤24 | QHYB60-0.4-150LG-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤36 | QHYB60-0.6-150LG-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤50 | QHYB60-0.8-150LG-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤72 | QHYB60-1.0-150LG-3 |
| Production 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 appropriate models according to the parameters provided. | ||||||
How to Select a Pump Model
QHYB / LG System Selection Criteria
- Determine total water demand and peak flow requirements.
- Calculate required constant pressure setpoint.
- Evaluate building height and pipeline resistance loss.
- Select number of pump units based on redundancy requirement.
- Confirm power supply conditions and control mode.
Engineering Notes
- System must operate within designed pressure range
- Dry-running protection must be enabled
- Sensor calibration is required before commissioning
- Pipeline backflow prevention must be ensured
Compliance & Quality Assurance
- Factory system integration testing
- Pressure stability performance test
- Electrical control system verification
- Pump efficiency curve validation
- Optional third-party inspection available
Safety Notice
- Do not operate without water supply
- Ensure electrical grounding is properly installed
- Do not exceed rated system pressure
- Disconnect power before maintenance
OEM & Customization
This system supports engineered configuration and project-based customization. Technical adjustments can be made according to water demand and installation conditions.
Available options include:
• Pump configuration (single / multi-pump)
• Control system logic customization
• Pressure range setting
• Motor efficiency class selection
• Cabinet protection level (IP rating)
Configuration is determined based on hydraulic demand and project specifications.
FAQs
Q1: Can the system maintain constant pressure automatically?
Yes, it uses closed-loop feedback control for automatic pressure regulation.
Q2: Can multiple pumps operate together?
Yes, multi-pump parallel operation is supported.
Q3: What is the control accuracy?
Pressure control accuracy is approximately ±0.01 MPa.
Q4: Is dry-run protection included?
Yes, system includes dry-run protection logic.
Q5: What water quality is required?
Clean water without solids or fibers is required.
Q6: Can it be used in high-rise buildings?
Yes, it is designed for high-rise pressurized water supply systems.