Product Overview
The QHYB-LG Automatic Variable-Frequency Packaged Water Supply Unit (equipped with LG easy-maintenance multistage pumps) is a tankless, integrated packaged water supply system consisting of a pump set, an automatic control system, and a boosting & pressure-stabilizing device. System capacity is determined by the pump configuration, while coordinated operation and regulation are managed by the control system. The boosting and pressure-stabilizing device stores hydraulic energy and maintains pipeline pressure to compensate for low-flow consumption and normal pipeline leakage. When water demand increases and network pressure drops, the system automatically starts the pumps to ensure continuous water supply.
Model Designation
Key Features
• Tankless packaged structure with high integration of pumps, controls, and pressure-stabilizing components
• Supports both pneumatic packaged mode and variable-frequency packaged mode for different operating requirements
• Parallel operation of 1–4 pumps or more to meet various design flow and head demands
• Low-flow conditions handled by a small-flow boosting/pressure-stabilizing unit to reduce frequent main-pump starts, improve efficiency, and lower overall energy consumption
Engineering Summary
The QHYB-LG packaged unit uses multistage pumps as the core water supply equipment, with pump operation automatically regulated by the control system. Depending on the required operating mode, the system can be configured as a pneumatic packaged water supply unit or a variable-frequency packaged water supply unit. Based on the design flow and required head, 1–4 pumps or more can be arranged for parallel operation. Under low-flow conditions, a small-flow boosting and pressure-stabilizing pump unit operates in alternation/standby mode to improve operating efficiency and reduce total energy consumption.
Typical Applications
The QHYB-LG packaged water supply unit is widely used in:
• Domestic and residential water supply systems
• Industrial water supply systems
• Firefighting and sprinkler water supply systems
• Irrigation and related water supply projects
Depending on demand characteristics, the system is suitable for both continuous-demand applications (e.g., large hotels, catering facilities, industrial or mining enterprises) and intermittent-demand applications (e.g., office buildings, commercial residential buildings, and certain water treatment systems), while accommodating seasonal and regional variations in water usage.
System Configuration
The QHYB-LG adopts a packaged, centralized pump-set arrangement. The main pump set provides primary supply capacity; during low-flow operation, the auxiliary boosting/pressure-stabilizing unit is prioritized to avoid frequent main-pump starts, thereby reducing mechanical wear and extending service life. Automatic start/stop control and operating-mode switching are implemented through the control system to minimize manual intervention, making the unit suitable for long-term operation.
Components & Supply
The QHYB-LG automatic packaged water supply unit mainly includes:
• Multistage pump unit (main pumps and optional auxiliary small-flow pump)
• Automatic control system
• Boosting and pressure-stabilizing device
• Piping connections and integrated packaged components
Technical Service
As the core power section of the packaged unit, the pump set can be matched with multistage pump configurations suitable for different flow and head requirements. The packaged, highly integrated structure simplifies installation and site work. Operationally, low-flow conditions are handled by the auxiliary pressure-stabilizing unit to reduce main-pump start frequency, lowering wear and improving long-term reliability.
Operating Conditions
System selection and configuration should be comprehensively determined based on:
• Design water supply flow rate
• Required supply pressure (head)
• Supply mode (continuous or intermittent operation)
• Daily and seasonal variations in water consumption
• Regional differences and application-specific operating conditions
Service Conditions
• Suitable for long-term operation, supporting both continuous-demand and intermittent-demand water use profiles
• Low-flow stages are handled by the boosting/pressure-stabilizing unit for pressure and leakage compensation, reducing frequent main-pump starts
• Adapts to seasonal and regional demand fluctuations while maintaining stable pipeline pressure
Protection Functions
• Automatic pump start/stop and operating-mode switching via the control system to reduce reliance on manual operation
• Variable-frequency packaged mode provides constant-pressure supply with typical pressure control accuracy of 0.02 MPa
• VFD soft-start reduces inrush current, mechanical shock, and operating noise (compared with direct-on-line constant-speed starting)
Selection Criteria
• Domestic/industrial constant-pressure supply: select pneumatic or variable-frequency mode based on design flow, required head, and demand fluctuation characteristics, and determine the number of pumps in parallel (1–4 pumps or more).
• Firefighting/sprinkler supply: pneumatic packaged water supply units are generally recommended, typically combined with a small-flow auxiliary pump to compensate for normal pipeline leakage and maintain network pressure.
• Applications with higher requirements for energy saving and control precision: the variable-frequency packaged mode can be applied; compared with conventional pneumatic packaged systems, average energy savings are about 20% when properly matched to the duty profile and control strategy.
Specifications & Installation
Selection Guide
I. Pump Selection for Variable-Frequency Constant-Pressure Packaged Water Supply Units
| 1. Selection of water supply height for variable-frequency constant-pressure packaged water supply units | ||||||||||
|
Unit head (m)
|
20
|
26
|
32
|
40
|
50
|
60
|
70
|
80
|
100
|
120
|
|
Water supply height (m)
|
10
|
14
|
18
|
25
|
32
|
38
|
46
|
55
|
72
|
88
|
| 2. Selection of number of households served by variable-frequency constant-pressure packaged water supply units | ||||||
|
Unit flow rate (m³/h)
|
6
|
12
|
18
|
25
|
36
|
50
|
|
Number of households served
|
20–30
|
40–60
|
60–100
|
100–150
|
150–200
|
200–300
|
|
Unit flow rate (m³/h)
|
75
|
100
|
150
|
200
|
250
|
|
Number of households served
|
400–500
|
600–1000
|
1000–1500
|
1500–2000
|
2000–3000
|
Performance Parameters
|
Applicable Building
|
Sprinkler flow rate
(L/s) |
Operating pressure
at sprinkler head (MPa) |
Applicable building height
(m) |
Recommended packaged water supply model
Vertical pump set |
||
|
Building type
|
Design density
(L/min·m²) |
Coverage area
(m²) |
||||
|
Production building
|
10
|
300
|
60
|
0.1
|
≤12
|
QHYB60-0.24-150LG-3
|
|
Production building
|
10
|
300
|
60
|
0.1
|
≤24
|
QHYB60-0.4-150LG-3
|
|
Production building
|
10
|
300
|
60
|
0.1
|
≤36
|
QHYB60-0.6-150LG-3
|
|
Production building
|
10
|
300
|
60
|
0.1
|
≤50
|
QHYB60-0.8-150LG-3
|
|
Production building
|
10
|
300
|
60
|
0.1
|
≤72
|
QHYB60-1.0-150LG-3
|
|
Production 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 appropriate models according to the parameters provided. | ||||||
OEM & Custom
Chaodun Pump provides OEM and ODM customization for QHYB-LG systems, including pump selection, control configuration, and material optimization for residential, municipal, and industrial water supply systems.
FAQs
- Q1: What is the QHYB-LG system used for?
It is designed for automatic, constant-pressure water supply in domestic, industrial, and fire protection systems. - Q2: What type of pump is used?
LG vertical multistage high-rise building centrifugal pump. - Q3: What are its main advantages?
Energy efficiency, low noise, automatic control, and reliable operation. - Q4: How many pumps can operate together?
1–4 pumps in parallel, or more for high-demand systems. - Q5: What control method is applied?
Variable frequency control system with precise pressure regulation. - Q6: What materials are used?
Corrosion-resistant alloys and stainless steel construction for durability. - Q7: Does Chaodun Pump offer OEM customization?
Yes, full OEM/ODM support including pump model, control design, and system integration.