Product Description
Model Code Explanation
Product Introduction
QHYB-ISG Domestic Variable Frequency Automatic Water Supply System (equipped with ISG vertical inline 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-ISG Domestic Variable Frequency Automatic Water Supply System (with ISG vertical inline pump) can be divided into air-pressure water supply systems and variable-frequency water supply systems according to different working modes, each with its own advantages. It is widely used in domestic, fire-fighting, industrial and sprinkler water supply 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 within the low-flow range to switch with the main pump, improving efficiency and further 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 water supply pressure (head). In addition, the usage pattern and type of flow variation must be considered.
Continuous type: The flow rarely drops to zero during the day, or normal pipeline leakage maintains a minimum flow. Typical examples include booster systems for large hotels, restaurants, and industrial and mining enterprises.
Intermittent type: Water demand is very low or zero for long periods during off-peak hours. Examples include small office buildings, office towers, mixed commercial-residential buildings, residential complexes, and production water usage.
Other factors include flow variations during specific time periods, seasonal demand differences, and regional water-use characteristics.
Fire-fighting sprinkler water supply systems generally should use air-pressure water supply units, because they remain in a long-term pressure-holding state with no flow variation. Air-pressure systems can handle general pipeline leakage, and with the addition of a small-flow auxiliary pump, the main pump does not need to start under normal conditions, saving energy.
Advantages of variable frequency water supply systems:
They provide constant-pressure water supply, with an adjustable set pressure within a certain range and a typical pressure accuracy of ≤0.02 MPa. Variable-frequency speed regulation is a highly efficient, energy-saving method, reducing energy consumption by about 20% on average compared with conventional air-pressure water supply systems. In addition, variable-frequency starting reduces inrush current and hydraulic impact on the pump, and the noise level is low during low-speed operation.
Advantages of air-pressure water supply systems:
Relatively low cost, simple control technology, easy service, and convenient maintenance.
Selection Guide
I. Pump Selection 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
|
QHYB60-0.24-100ISG-3
|
|
Industrial Building
|
10
|
300
|
60
|
0.1
|
≤24
|
QHYB60-0.4-100ISG-3
|
|
Industrial Building
|
10
|
300
|
60
|
0.1
|
≤36
|
QHYB60-0.6-100ISG-3
|
|
Industrial Building
|
10
|
300
|
60
|
0.1
|
≤50
|
QHYB60-0.8-100ISG-3
|
|
Industrial Building
|
10
|
300
|
60
|
0.1
|
≤72
|
QHYB60-1.0-100ISG-3
|
|
Industrial 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 the appropriate model according to the parameters provided. | ||||||
OEM & Custom Solutions
We offer OEM/ODM customization for system configuration, pump selection, voltage (220V/380V/415V), and control options. Optional stainless steel manifolds, touchscreen HMI, and remote monitoring modules are available. All systems are ISO9001 and CE certified for export applications.
FAQs for Oversea Buyers
Q: What’s the advantage of QHYB-ISG?
A: It provides constant pressure, stable operation, and high energy efficiency using ISG inline pumps.
Q: What’s the pressure control accuracy?
A: ±0.02 MPa under frequency regulation.
Q: Can it be used for firefighting?
A: Yes, available in combined domestic/firefighting configurations.
Q: What’s the difference between air-pressure and variable frequency types?
A: Variable frequency is more precise and energy-efficient; air-pressure is more economical and easier to maintain.
Q: Do you provide OEM service?
A: Yes, we offer private labeling, control system customization, and export packaging.
Q: Which markets use this product?
A: Exported to Southeast Asia, Middle East, and South America for residential and municipal systems.