Product Description
Model Code Explanation
Product Overview
QHYB-GDL Variable Frequency Water Supply System (equipped with GDL vertical detachable pipeline multistage centrifugal pumps) is a new towerless integrated water supply solution. It consists of three main parts: pump units, control system, and pressure-stabilizing booster unit. The pump units determine the supply capacity; the control system ensures coordinated operation; the booster/stabilizing unit mainly stores energy and maintains pressure to handle small water demand and normal pipeline leakage, and it is also an essential part of automatic control. When large water consumption occurs and the pipeline pressure drops, the pumps start automatically to supply water.
According to different working modes, QHYB-GDL systems can be divided into pneumatic (pressure-tank) water supply sets and VFD (variable-frequency) water supply sets, each with its own characteristics. They are widely used for domestic water supply, firefighting, industrial production, sprinkler systems, and other fields.
The pump is the foundation of the whole set and the key guarantee of its water-supply capability. The matching pumps are universal and can be selected with suitable flow rate and head. Depending on required flow and head, the system can operate 1–4 or more pumps in parallel. A separate booster/stabilizing small-flow pump group can switch with the main pumps within a low-flow range to improve efficiency and further reduce energy consumption.
Depending on the working mode and application, the system can be configured as domestic type, firefighting type, sprinkler type, or combined domestic & firefighting type.
Selection Basis
The basic criteria for selecting an automatic water supply set are the designed supply flow rate and supply pressure (water head). The flow-variation pattern of the application should also be considered.
Continuous Type: Flow is rarely zero during a day, or normal pipeline leakage maintains a certain flow rate, such as pressurization systems for large hotels, restaurants, and industrial/mining enterprises.
Intermittent Type: Long low-demand periods with very small or zero flow, such as small office buildings, commercial-residential buildings, various residences, and production water use.
Flow changes within specific supply periods, seasonal variations, and regional differences in water demand should also be taken into account.
For firefighting sprinkler water supply sets, pneumatic systems are generally recommended. Since they remain in a pressure-holding state for long periods with no flow variation, they can handle normal pipeline leakage. With an additional small-flow auxiliary pump, the main pumps do not need to start during standby operation, saving energy.
Advantages of VFD Water Supply Sets: Constant-pressure water supply with adjustable pressure setpoint within a certain range; pressure accuracy is typically better than 0.02 MPa. VFD speed control is a highly efficient energy-saving method, saving about 20% on average compared with conventional pneumatic systems. In addition, VFD starting reduces inrush current and water hammer impact, and provides lower noise at low speed.
Advantages of Pneumatic Water Supply Sets: Lower overall cost, simpler control technology, convenient service, and easy maintenance.
Selection Guide
I. Pump Selection for Integrated Water Supply Systems
| 1. Selection of Supply Head for VFD Constant-Pressure Water Supply Systems | ||||||||||
|
Pump Head (m)
|
20
|
26
|
32
|
40
|
50
|
60
|
70
|
80
|
100
|
120
|
|
Supply Height (m)
|
10
|
14
|
18
|
25
|
32
|
38
|
46
|
55
|
72
|
88
|
| 2. Selection by Number of Households for VFD Constant-Pressure Water Supply Systems | ||||||
|
System Flow Rate (m³/h)
|
6
|
12
|
18
|
25
|
36
|
50
|
|
Number of Households
|
20~30
|
40~60
|
60~100
|
100~150
|
150~200
|
200~300
|
|
System Flow Rate (m³/h)
|
75
|
100
|
150
|
200
|
250
|
|
Number of Households
|
400~500
|
600~1000
|
1000~1500
|
1500~2000
|
2000~3000
|
Performance Parameters
|
Applicable Buildings
|
Spray Flow
(L/S) |
Operating Pressure
(MPa) |
Applicable Building Height
(m) |
Recommended Water Supply System Model
(Vertical Pump Set) |
||
|
Building Type
|
Design Spray Density
(L/min·m²) |
Operating Area
(m²) |
||||
|
Industrial Buildings
|
10
|
300
|
60
|
0.1
|
≤12
|
QHYB60-0.24-125GDL-3
|
|
Industrial Buildings
|
10
|
300
|
60
|
0.1
|
≤24
|
QHYB60-0.4-125GDL-3
|
|
Industrial Buildings
|
10
|
300
|
60
|
0.1
|
≤36
|
QHYB60-0.6-125GDL-3
|
|
Industrial Buildings
|
10
|
300
|
60
|
0.1
|
≤50
|
QHYB60-0.8-125GDL-3
|
|
Industrial Buildings
|
10
|
300
|
60
|
0.1
|
≤72
|
QHYB60-1.0-125GDL-3
|
|
Industrial Buildings
|
10
|
300
|
60
|
0.1
|
≤100
|
QHYB60-1.2-125GDL-3
|
|
Storage Buildings
|
15
|
300
|
90
|
0.1
|
≤12
|
QHYB90-0.24-150CDL-3
|
|
Storage Buildings
|
15
|
300
|
90
|
0.1
|
≤24
|
QHYB90-0.4-150CDL-3
|
|
Storage Buildings
|
15
|
300
|
90
|
0.1
|
≤36
|
QHYB90-0.6-150CDL-3
|
|
Storage Buildings
|
15
|
300
|
90
|
0.1
|
≤50
|
QHYB90-0.8-150CDL-3
|
|
Storage Buildings
|
15
|
300
|
90
|
0.1
|
≤72
|
QHYB90-1.0-150CDL-3
|
|
Storage Buildings
|
15
|
300
|
90
|
0.1
|
≤100
|
QHYB90-1.2-150CDL-3
|
|
Moderate Hazard Class
|
6
|
300
|
40
|
0.1
|
≤12
|
QHYB40-0.24-100CDL-3
|
|
Moderate Hazard Class
|
6
|
300
|
40
|
0.1
|
≤24
|
QHYB40-0.4-100CDL-3
|
|
Moderate Hazard Class
|
6
|
300
|
40
|
0.1
|
≤36
|
QHYB40-0.6-100CDL-3
|
|
Moderate Hazard Class
|
6
|
300
|
40
|
0.1
|
≤50
|
QHYB40-0.8-100CDL-3
|
|
Moderate Hazard Class
|
6
|
300
|
40
|
0.1
|
≤72
|
QHYB40-1.0-100CDL-3
|
|
Moderate Hazard Class
|
6
|
300
|
40
|
0.1
|
≤100
|
QHYB40-1.2-100CDL-3
|
|
Light Hazard Class
|
3
|
300
|
15
|
0.1
|
≤12
|
QHYB15-0.24-65GDL-3
|
|
Light Hazard Class
|
3
|
300
|
15
|
0.1
|
≤24
|
QHYB15-0.4-65GDL-3
|
|
Light Hazard Class
|
3
|
300
|
15
|
0.1
|
≤36
|
QHYB15-0.6-65GDL-3
|
|
Light Hazard Class
|
3
|
300
|
15
|
0.1
|
≤50
|
QHYB15-0.8-65GDL-3
|
|
Light Hazard Class
|
3
|
300
|
15
|
0.1
|
≤72
|
QHYB15-1.0-65GDL-3
|
|
Light Hazard Class
|
3
|
300
|
15
|
0.1
|
≤100
|
QHYB15-1.2-65GDL-3
|
| Users may select the appropriate model based on the parameters above. | ||||||
OEM & Custom Solutions
We provide OEM/ODM customization for voltage (220V/380V/415V), pump models, control cabinet, and tank capacity. Optional stainless steel manifolds, HMI touch control, and remote monitoring are available. All systems meet ISO9001 and CE export standards for global markets.
FAQs for Oversea Buyers
Q: What’s the main advantage of the QHYB-GDL system?
A: It maintains constant water pressure automatically while saving energy and reducing system wear.
Q: What type of pump is used?
A: GDL vertical multistage inline centrifugal pump, known for high efficiency and compact design.
Q: Can it handle both domestic and firefighting water?
A: Yes, the combined type can serve domestic and firefighting applications simultaneously.
Q: What’s the control accuracy?
A: ±0.02 MPa pressure stability under variable frequency control.
Q: What’s the difference between air-pressure and variable frequency types?
A: Variable frequency systems are more efficient and stable; air-pressure systems are simpler and lower cost.
Q: Do you support OEM customization?
A: Yes, including custom branding, control cabinet design, and export packaging.
Q: Which markets use this equipment?
A: Exported to Southeast Asia, the Middle East, and South America for building and industrial projects.