Product Description
Performance Parameters
Product Introduction
QHYB-LG Automatic Variable Frequency Water Supply System (equipped with LG detachable high-rise multistage pump) is a new type of tankless integrated water supply unit. It consists of three major parts: pump unit, control system, and pressure boosting & stabilizing unit.
The water supply capacity is determined by the pump unit, while coordinated system operation is controlled by the control system. The pressure-stabilizing device stores energy, maintains system pressure, handles small water consumption and normal pipeline leakage, and is an essential part of automatic control.
When water consumption increases and pipeline pressure drops, the pump starts automatically.
QHYB-LG water supply systems can be divided into two types based on working mode: air-pressure water supply systems and variable-frequency water supply systems, each with its own characteristics. They are widely used in domestic water supply, fire-fighting, industrial processes, spraying systems, and many other applications.
The pump is the core of the entire system and ensures water delivery capability. Various pumps with suitable flow and head can be configured. Depending on system requirements, 1–4 or more pumps can operate in parallel. A small booster pump (auxiliary pump) is used for low-flow operation, improving efficiency and reducing energy consumption.
According to application needs, the equipment can be classified into domestic type, fire-fighting type, sprinkler type, and combined domestic-fire application type.
Selection Criteria
The basic parameters for selecting an automatic water supply system are the designed water supply flow and pressure (head). Additionally, the type of usage and flow variation must be considered.
Continuous Type: The flow rarely drops to zero during the day, or normal pipeline leakage maintains a minimum flow. Examples: large hotels, restaurants, industrial booster systems.
Intermittent Type: Long periods of low or zero water demand. Examples: small office buildings, commercial-residential buildings, residential complexes, and general production usage.
Other factors include: flow variations during specific time periods, seasonal demand differences, and regional water-use characteristics.
Fire-fighting sprinkler systems typically require air-pressure water supply systems because they remain in a long-term pressure-holding state with no flow variation. An auxiliary small-flow pump is added to handle leakage without starting the main pump, thus saving energy.
Advantages of Variable Frequency Water Supply Systems:
– Provides constant pressure water supply with pressure accuracy ≤0.02 MPa
– Saves 20% energy compared with air-pressure water supply systems
– Lower starting current and reduced pump impact
– Low noise under low-speed operation
Advantages of Air-Pressure Water Supply Systems:
– Lower cost
– Simple control technology
– Easy servicing and maintenance
Selection Guide
1. Selecting Pumps for Variable Frequency Constant-Pressure Water Supply Systems
| 1. Selection Based on Equipment Head | ||||||||||
|
Equipment 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 Based on Number of Households Served | ||||||
|
Flow Rate (m³/h)
|
6
|
12
|
18
|
25
|
36
|
50
|
|
Households Served
|
20–30
|
40–60
|
60–100
|
100–150
|
150–200
|
200–300
|
|
Flow Rate (m³/h)
|
75
|
100
|
150
|
200
|
250
|
|
Households Served
|
400–500
|
600–1000
|
1000–1500
|
1500–2000
|
2000–3000
|
Performance Parameters
|
Applicable Buildings
|
Sprinkler Flow (L/s)
|
Sprinkler Operating Pressure (MPa)
|
Applicable Building Height (m)
|
Recommended Water Supply System Model (Vertical Pump Set)
|
||
|
Building Type
|
Design Sprinkler Density (L/(min·m²))
|
Coverage Area (m²)
|
||||
|
Industrial Building
|
10
|
300
|
60
|
0.1
|
≤12
|
QHYB60-0.24-150LG-3
|
|
Industrial Building
|
10
|
300
|
60
|
0.1
|
≤24
|
QHYB60-0.4-150LG-3
|
|
Industrial Building
|
10
|
300
|
60
|
0.1
|
≤36
|
QHYB60-0.6-150LG-3
|
|
Industrial Building
|
10
|
300
|
60
|
0.1
|
≤50
|
QHYB60-0.8-150LG-3
|
|
Industrial Building
|
10
|
300
|
60
|
0.1
|
≤72
|
QHYB60-1.0-150LG-3
|
|
Industrial 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 the appropriate model according to the parameters provided. | ||||||
OEM & Custom Solutions
We provide OEM/ODM customization for voltage (220V/380V/415V), pump models, and control systems. Optional stainless steel manifolds, HMI touch screen, and remote monitoring are available. All systems comply with ISO9001 and CE standards for export.
FAQs for Oversea Buyers
Q: What’s the advantage of the QHYB-LG system?
A: It provides constant pressure and energy-saving operation for high-rise and municipal water supply applications.
Q: What type of pump is used?
A: LG vertical multistage centrifugal pump, detachable design for easy maintenance.
Q: What’s the control accuracy?
A: ±0.02 MPa under variable frequency control.
Q: Can it serve firefighting and domestic water simultaneously?
A: Yes, combined systems are available for dual-purpose use.
Q: What’s the difference between variable frequency and air-pressure systems?
A: Variable frequency saves more energy and maintains precise pressure; air-pressure systems are simpler and more cost-effective.
Q: Do you provide OEM/ODM services?
A: Yes, full customization including branding, voltage, and control cabinet configuration.
Q: Which markets use this system?
A: Exported to Southeast Asia, the Middle East, and Africa for residential and municipal projects.