QHYB-GDL Automatic Variable Frequency Water Supply Equipment

QHYB-GDL Automatic Variable Frequency Water Supply Equipment

QHYB-GDL VFD Water Supply System | Inline multistage constant-pressure booster

  • VFD constant-pressure: Stable, energy-efficient control.
  • GDL multistage pumps: Compact inline boosting.
  • Multi-pump control: Staging/alternation to match demand.
  • Protection & alarms: Dry-run/low-pressure + overpressure.
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Product Overview 

The QHYB-GDL Variable Frequency Constant Pressure Water Supply System, equipped with the GDL vertical multistage centrifugal pump, is a modern tankless integrated water supply solution. The system consists of three main components: the pump unit, the automatic control system, and the pressurization and pressure stabilization device. The water supply capacity is determined by the pump configuration, while the system operation is managed by the automatic control system. The pressurization and pressure stabilization device stores hydraulic energy and maintains pipeline pressure, compensating for low water demand and normal pipeline leakage. When water demand increases and pipeline pressure drops, the pump will automatically start to restore the supply pressure.

Model Designation

QHYB GDL Automatic Variable Frequency Water Supply Equipment type

Key Features 

  • Automatic pump speed adjustment to maintain constant network pressure

  • Integrated control system ensures efficient and stable operation

  • High-efficiency, energy-saving operation

  • Supports low-flow operation conditions for improved efficiency

Engineering Summary 

The QHYB-GDL system adopts variable frequency control to adjust pump operation automatically and maintain constant pressure throughout the distribution network. The system configuration is based on the required design flow and head, and it allows for parallel operation of 1 to 4 pumps or more, depending on system needs. In low-flow conditions, the main pump and auxiliary pressurization pump alternate to improve efficiency and reduce overall energy consumption.

Typical Applications 

  • Domestic and residential water supply systems

  • Firefighting water supply systems

  • Industrial process water systems

  • Irrigation and spraying systems

System Configuration 

The QHYB-GDL system includes the following major components:

  • Multistage centrifugal pump unit (main pump and optional auxiliary pump)

  • Automatic control system

  • Pressurization and pressure stabilization device

  • Integrated pipeline and encapsulation components

Components & Supply 

  • Pump Unit: High-efficiency multistage centrifugal pumps (main pump and auxiliary pump options)

  • Control System: Intelligent automatic control system

  • Pressurization & Pressure Stabilization Device: Ensures stable pressure and energy storage

  • Integrated Pipeline Components: Simplifies installation and maintenance

Technical Service 

  • System commissioning and installation training

  • Regular maintenance and troubleshooting services

  • Performance monitoring and optimization recommendations

Operating Conditions 

  • Design Flow: Based on actual requirements

  • Required Supply Pressure (Head): Based on system configuration and application needs

  • Flow Variation Modes: Continuous or intermittent demand

  • Seasonal and Regional Demand Fluctuations: Consideration of local water consumption changes

Service Conditions 

  • Suitable for stable environmental conditions

  • Long-term reliable operation

  • Adaptable to seasonal and regional variations

  • Ensures safe and efficient system operation

Protection Functions 

  • Equipped with overload protection

  • Equipped with low water level protection

  • Pressure monitoring and automatic adjustment

  • Protection against system overheating or overpressure

Selection Criteria 

  • Design Flow: Based on water consumption requirements

  • Required Pressure (Head): Based on application and system configuration

  • Application Type: Continuous or intermittent flow

  • Environmental and Regional Conditions: Consideration of specific local and seasonal water demand

Specifications & Installation

Selection & Sizing 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

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

  1. 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.
  2. Q: What type of pump is used?
    A: GDL vertical multistage inline centrifugal pump, known for high efficiency and compact design.
  3. Q: Can it handle both domestic and firefighting water?
    A: Yes, the combined type can serve domestic and firefighting applications simultaneously.
  4. Q: What’s the control accuracy?
    A: ±0.02 MPa pressure stability under variable frequency control.
  5. 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.
  6. Q: Do you support OEM customization?
    A: Yes, including custom branding, control cabinet design, and export packaging.
  7. Q: Which markets use this equipment?
    A: Exported to Southeast Asia, the Middle East, and South America for building and industrial projects.