Product Overview
QHYB-ISG Variable Frequency Water Supply Equipment
QHYB-ISG Variable Frequency Water Supply Equipment is a constant-pressure water supply system integrating ISG vertical in-line pumps, frequency converters, pressure sensors, and intelligent control cabinets for automated water pressure regulation.
It addresses unstable outlet pressure, excessive energy consumption of fixed-speed pump systems, and pressure fluctuation under variable water demand conditions.
It is suitable for high-rise buildings, municipal secondary pressurization, commercial complexes, and industrial circulating water supply systems.
Model Designation
Applications
Typical Operating Scenarios
- High-rise residential constant pressure water supply
- Municipal secondary water boosting stations
- Commercial building domestic water distribution
- Industrial circulating water systems
- Fire water standby integrated pressurization systems
- Hospital and hotel centralized water supply
Engineering Advantages
Structural Design Logic & Engineering Results
• ISG vertical in-line pump configuration → Direct pipeline integration with reduced installation footprint
• Variable frequency closed-loop pressure control → Maintains constant outlet pressure under fluctuating demand
• Multi-pump automatic switching logic → Ensures redundancy and balanced operating hours
• Soft start & stop operation → Reduces hydraulic shock and prolongs pipeline life
System Components
QHYB-ISG Variable Frequency Water Supply Equipment：
- ISG vertical in-line centrifugal pump
- Variable frequency drive (VFD)
- Intelligent control cabinet
- Pressure sensors
- Check valves
- Isolation valves
- Base frame and manifold assembly
Technical Specifications
Service Conditions
Clean water or similar non-corrosive liquids
No solid particles or long fibers
Continuous automatic operation
Operating Conditions
- Flow rate: 5 – 400 m³/h
- Head: 10 – 160 m
- Power range: 2.2 – 200 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 unit model
Vertical pump set |
||
| Building type |
Design sprinkler intensity
(L/min·m²) |
Coverage area
(m²) |
||||
| Production building | 10 | 300 | 60 | 0.1 | ≤12 | QHYB60-0.24-100ISG-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤24 | QHYB60-0.4-100ISG-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤36 | QHYB60-0.6-100ISG-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤50 | QHYB60-0.8-100ISG-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤72 | QHYB60-1.0-100ISG-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤100 | QHYB60-1.2-100ISG-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤12 | QHYB90-0.24-150ISG-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤24 | QHYB90-0.4-150ISG-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤36 | QHYB90-0.6-150ISG-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤50 | QHYB90-0.8-150ISG-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤72 | QHYB90-1.0-150ISG-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤100 | QHYB90-1.2-150ISG-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤12 | QHYB40-0.24-100ISG-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤24 | QHYB40-0.4-100ISG-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤36 | QHYB40-0.6-100ISG-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤50 | QHYB40-0.8-100ISG-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤72 | QHYB40-1.0-100ISG-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤100 | QHYB40-1.2-100ISG-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤12 | QHYB15-0.24-65ISG-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤24 | QHYB15-0.4-65ISG-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤36 | QHYB15-0.6-65ISG-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤50 | QHYB15-0.8-65ISG-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤72 | QHYB15-1.0-65ISG-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤100 | QHYB15-1.2-65ISG-3 |
| Users can select appropriate models according to the parameters provided. | ||||||
How to Select a Pump Model
QHYB-ISG System Selection Criteria
- Determine peak flow rate and average water consumption.
- Calculate required outlet pressure considering building height and pipe losses.
- Select pump quantity based on redundancy and standby requirements.
- Confirm electrical supply conditions and protection grade requirements.
- Evaluate installation space for vertical in-line configuration.
Engineering Notes
- Ensure sufficient NPSH to avoid cavitation in high-rise applications
- Parallel pump logic must be configured according to load curve
- Sensor installation location affects pressure control accuracy
- Avoid frequent start-stop cycles beyond control parameters
Compliance & Quality Assurance
- Factory system integration and pressure simulation test
- Pump hydraulic performance verification
- Electrical control system functional test
- Motor insulation resistance test
- Optional third-party inspection available
Safety Notice
- Do not operate without water supply
- Ensure reliable grounding of control cabinet
- 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 hydraulic demand and installation conditions.
Available options include:
• Pump configuration (single / multi-pump)
• Motor voltage & frequency
• Control logic customization
• Cabinet protection class (IP rating)
• Communication interface (Modbus, PLC integration)
Configuration is determined based on duty point and project specifications.
FAQs
Q1: Can the system operate under VFD control?
Yes, the system is based on variable frequency closed-loop control.
Q2: What is the maximum allowable system pressure?
Maximum system pressure is ≤ 2.5 MPa.
Q3: How accurate is the pressure control?
Control accuracy is approximately ±0.01 MPa.
Q4: Can multiple pumps operate alternately?
Yes, automatic alternating and parallel operation are supported.
Q5: Is it suitable for high-rise buildings?
Yes, it is designed for vertical pressurized pipeline systems.
Q6: What liquid quality is required?
Clean water without solid particles or fibers is required.