Product Overview
QHYB-GDL Domestic Variable Frequency Constant Pressure Water Supply Equipment is an integrated multi-pump variable frequency booster system based on GDL vertical multistage centrifugal pumps, designed for constant-pressure water distribution in building supply networks.
It addresses pressure fluctuation, peak-hour flow instability, and excessive energy consumption associated with fixed-speed pump operation in multi-terminal distribution systems.
It is suitable for residential buildings, high-rise secondary water boosting, municipal branch pipeline stabilization, and constant-pressure water supply in commercial facilities.
Model Designation
Applications
• High-rise residential secondary boosting stations
• Apartment complex constant-pressure domestic supply
• Commercial building multi-terminal distribution systems
• Municipal branch pipeline pressure stabilization
• Retrofit of traditional pressure tank water supply systems
Engineering Advantages
• Multi-pump cascade control ensures stable discharge pressure under variable flow demand.
• Variable frequency speed regulation reduces energy consumption during partial-load operation.
• GDL vertical multistage hydraulic structure provides high head and smooth performance curve.
• Closed-loop PID pressure feedback system maintains precise pressure control.
• Integrated skid-mounted structure simplifies installation and reduces alignment workload.
System Components
QHYB-GDL Domestic Variable Frequency Constant Pressure Water Supply Equipment mainly includes:
• GDL vertical multistage centrifugal pump units
• Variable frequency drive (VFD) controller
• PLC control panel with pressure sensor
• Stainless steel inlet and discharge manifold
• Check valves and isolation valves
• Base frame and vibration isolation assembly
Technical Parameters
Service Conditions
Clean water without solid particles or fibers
Non-corrosive liquid compatible with stainless steel components
Indoor booster room installation
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 water supply unit model
Vertical pump set |
||
| Building type |
Design density
(L/min·m²) |
Coverage area
(m²) |
||||
| Production building | 10 | 300 | 60 | 0.1 | ≤12 | QHYB60-0.24-125GDL-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤24 | QHYB60-0.4-125GDL-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤36 | QHYB60-0.6-125GDL-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤50 | QHYB60-0.8-125GDL-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤72 | QHYB60-1.0-125GDL-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤100 | QHYB60-1.2-125GDL-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤12 | QHYB90-0.24-150CDL-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤24 | QHYB90-0.4-150CDL-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤36 | QHYB90-0.6-150CDL-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤50 | QHYB90-0.8-150CDL-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤72 | QHYB90-1.0-150CDL-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤100 | QHYB90-1.2-150CDL-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤12 | QHYB40-0.24-100CDL-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤24 | QHYB40-0.4-100CDL-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤36 | QHYB40-0.6-100CDL-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤50 | QHYB40-0.8-100CDL-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤72 | QHYB40-1.0-100CDL-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤100 | QHYB40-1.2-100CDL-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤12 | QHYB15-0.24-65GDL-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤24 | QHYB15-0.4-65GDL-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤36 | QHYB15-0.6-65GDL-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤50 | QHYB15-0.8-65GDL-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤72 | QHYB15-1.0-65GDL-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤100 | QHYB15-1.2-65GDL-3 |
| Users can select appropriate models according to the parameters provided. | ||||||
How to Select a Pump Model
• Determine maximum and minimum water consumption profile of the building.
• Calculate total required head including static height and pipeline loss.
• Define redundancy configuration (e.g., N+1 pump arrangement).
• Select control mode based on pressure stability requirement.
• Confirm electrical supply specification and control integration needs.
Engineering Notes
• Pressure sensor placement directly affects control stability.
• Pumps should operate within high-efficiency range to avoid oscillation.
• Cascade switching frequency must be optimized to prevent excessive starts.
• Inlet pressure must meet NPSH requirement to avoid cavitation.
Compliance & Quality Assurance
• Factory hydraulic performance testing for each pump unit
• Control cabinet functional verification before shipment
• Material traceability for stainless steel components
• Electrical insulation and grounding inspection
• 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 equipment series 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 mode configuration
• Pressure tank capacity
• Stainless steel grade selection
Configuration is determined based on duty point and project specifications.
FAQs
Q: Can the system maintain constant pressure under varying flow demand?
A: Yes, the VFD adjusts pump speed via closed-loop pressure feedback.
Q: What is the allowable working pressure?
A: ≤ 1.6 MPa depending on configuration.
Q: Can pumps operate in parallel?
A: Yes, cascade control enables automatic parallel switching.
Q: Is the system compatible with building automation systems?
A: Yes, communication modules can be configured.。
Q: What type of pump is integrated?
A: GDL vertical multistage centrifugal pumps.
Q: Does variable frequency control reduce energy consumption?
A: Yes, energy savings occur under partial-load operation.