Product Overview
QHYB-DL Variable Frequency Water Supply System is an integrated multi-pump constant-pressure water supply equipment based on DL vertical multistage centrifugal pumps, designed for stable pressure control in building water distribution networks.
It addresses pressure fluctuation, energy inefficiency of fixed-speed pumps, and unstable flow distribution in multi-user water supply systems.
It is suitable for high-rise secondary water boosting, municipal branch pipeline stabilization, residential water supply systems, and industrial clean-water distribution networks.
Model Designation
Applications
• High-rise building secondary water supply pump rooms
• Residential community constant-pressure domestic water supply
• Municipal branch pipeline pressure regulation stations
• Industrial clean-water circulation and distribution systems
• Retrofit of traditional tank-type booster systems
Engineering Advantages
• Multi-pump cascade control ensures continuous pressure stability under variable demand conditions.
• Variable frequency drive (VFD) regulation reduces energy consumption during partial-load operation.
• DL vertical multistage hydraulic structure provides high head with compact footprint.
• Closed-loop pressure feedback system maintains constant discharge pressure within preset tolerance.
• Skid-mounted integrated structure simplifies installation and system commissioning.
System Components
QHYB-DL Variable Frequency Water Supply System mainly includes:
• DL vertical multistage centrifugal pump units
• Variable frequency drive (VFD) control unit
• PLC control cabinet with pressure sensor
• Stainless steel suction 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 materials
Indoor booster station installation
Operating Conditions
- Flow rate: 5 – 300 m³/h
- Head: 20 – 240 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 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 sprinkler intensity
(L/min·m²) |
Coverage area
(m²) |
||||
| Production building | 10 | 300 | 60 | 0.1 | ≤12 | QHYB60-0.24-100DL-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤24 | QHYB60-0.4-100DL-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤36 | QHYB60-0.6-100DL-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤50 | QHYB60-0.8-100DL-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤72 | QHYB60-1.0-100DL-3 |
| Production building | 10 | 300 | 60 | 0.1 | ≤100 | QHYB60-1.2-100DL-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤12 | QHYB90-0.24-150DL-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤24 | QHYB90-0.4-150DL-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤36 | QHYB90-0.6-150DL-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤50 | QHYB90-0.8-150DL-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤72 | QHYB90-1.0-150DL-3 |
| Storage building | 15 | 300 | 90 | 0.1 | ≤100 | QHYB90-1.2-150DL-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤12 | QHYB40-0.24-100DL-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤24 | QHYB40-0.4-100DL-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤36 | QHYB40-0.6-100DL-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤50 | QHYB40-0.8-100DL-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤72 | QHYB40-1.0-100DL-3 |
| Ordinary hazard | 6 | 300 | 40 | 0.1 | ≤100 | QHYB40-1.2-100DL-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤12 | QHYB15-0.24-65DL-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤24 | QHYB15-0.4-65DL-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤36 | QHYB15-0.6-65DL-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤50 | QHYB15-0.8-65DL-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤72 | QHYB15-1.0-65DL-3 |
| Light hazard | 3 | 300 | 15 | 0.1 | ≤100 | QHYB15-1.2-65DL-3 |
| Users can select appropriate models according to the parameters provided. | ||||||
How to Select a Pump Model
• Calculate peak and minimum water consumption of the building.
• Determine required head including static lift and pipeline loss.
• Select pump quantity based on redundancy requirement (e.g., N+1 configuration).
• Confirm control accuracy requirement for pressure deviation.
• Evaluate electrical supply specification and integration interface.
Engineering Notes
• Proper pressure sensor placement is critical for stable PID control.
• Pumps should operate within high-efficiency range to avoid pressure oscillation.
• Excessive pump switching frequency should be avoided to extend service life.
• Suction conditions must satisfy NPSH requirement to prevent cavitation.
Compliance & Quality Assurance
• Factory hydraulic performance testing for each DL pump unit
• Control cabinet functional verification before delivery
• Stainless steel material traceability documentation
• 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 during peak demand?
A: Yes, cascade VFD control adjusts pump speed automatically.
Q: What is the allowable working pressure?
A: ≤ 1.6 MPa depending on configuration.
Q: Can multiple pumps operate simultaneously?
A: Yes, automatic parallel operation is supported.
Q: Is the system energy efficient under partial load?
A: Yes, VFD regulation reduces unnecessary power consumption.
Q: What type of pump is integrated in this system?
A: DL vertical multistage centrifugal pumps.
Q: Can it integrate with building automation systems?
A: Yes, communication interfaces can be configured.