Product Description
Model Code Explanation
Product Description
QHYB-GDL domestic variable-frequency water supply unit (equipped with GDL vertical easy-maintenance inline multistage centrifugal pump) is a new type of tankless water supply system consisting of three main parts: pump unit, control system, and booster & pressure-stabilizing unit. The water supply capacity is determined by the pump unit, while the coordinated operation of the system is controlled by the control system. The main function of the booster & pressure-stabilizing unit is to store energy and maintain pressure, to cope with small water consumption and normal pipeline leakage. It is also an indispensable part of the automatic control system. When water consumption increases and the pipe network pressure drops, the pump starts automatically to supply water.
QHYB-GDL domestic variable-frequency water supply unit (equipped with GDL vertical easy-maintenance inline multistage centrifugal pump) can be divided into air-pressure water supply units and variable-frequency water supply units according to different operating modes, each with its own characteristics. It is widely used in domestic water supply, fire protection, industrial water supply and sprinkler systems across a variety of fields.
The pump is the core of the water supply unit and is the fundamental guarantee for its water supply performance. The pumps matched with the water supply unit are universal and can be any type with suitable flow and head characteristics. According to the required flow and head, 1–4 or more pumps can operate in parallel. The pump unit together with another booster and pressure-stabilizing power unit (small-flow pump group) can alternate with the main pump in the low-flow range to improve efficiency and further reduce energy consumption.
According to different operating modes, the equipment can be classified into domestic type, fire-fighting type, sprinkler type, and combined domestic & fire type, etc.
Selection Basis
The basic basis for selecting an automatic water supply unit is the design water supply flow and the required water supply pressure (pump head). In addition, the type of flow variation according to the application must also be considered.
Continuous type: cases where, over the course of a day, the flow rate rarely drops to zero, or where normal leakage in the pipeline itself maintains a certain flow rate, such as booster systems for large hotels, restaurants, and industrial & mining enterprises.
Intermittent type: cases with a long low-demand period and very small or near-zero flow rate, such as small office buildings, office towers, commercial-residential buildings, various residential buildings, and certain process water systems.
At the same time, changes in flow within specific time periods, seasonal variations in water consumption, and differences in water usage between different regions and applications should also be fully considered.
For fire sprinkler water supply units, air-pressure water supply units are generally recommended. As they remain in a long-term pressure-maintaining state with no actual flow variation, air-pressure units can compensate for normal pipeline leakage. By adding a small-flow auxiliary pump, the main pump does not need to start during normal conditions, thus saving energy.
Advantages of variable-frequency water supply units: they can provide constant-pressure water supply, and the constant-pressure value can be adjusted within a certain range. The constant-pressure accuracy is generally less than 0.02 MPa. Variable-frequency speed control is a highly efficient, energy-saving method, and compared with conventional air-pressure water supply units, it can save on average about 20% energy. In addition, the inrush current at variable-frequency starting is small, mechanical impact on the pump is small, and noise at low-speed operation is low.
Advantages of air-pressure water supply units: relatively low investment cost, simple control technology, convenient service and easy maintenance.
Selection Guide
I. Pump Selection for Water Supply Units
| 1. Selection of water supply height for variable-frequency constant-pressure 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 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 water supply unit model
Vertical pump set |
||
|
Building type
|
Design density
(L/min·m²) |
Coverage area
(m²) |
||||
|
Production building
|
10
|
300
|
60
|
0.1
|
≤12
|
QHYB60-0.24-125GDL-3
|
|
Production building
|
10
|
300
|
60
|
0.1
|
≤24
|
QHYB60-0.4-125GDL-3
|
|
Production building
|
10
|
300
|
60
|
0.1
|
≤36
|
QHYB60-0.6-125GDL-3
|
|
Production building
|
10
|
300
|
60
|
0.1
|
≤50
|
QHYB60-0.8-125GDL-3
|
|
Production building
|
10
|
300
|
60
|
0.1
|
≤72
|
QHYB60-1.0-125GDL-3
|
|
Production building
|
10
|
300
|
60
|
0.1
|
≤100
|
QHYB60-1.2-125GDL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤12
|
QHYB90-0.24-150CDL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤24
|
QHYB90-0.4-150CDL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤36
|
QHYB90-0.6-150CDL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤50
|
QHYB90-0.8-150CDL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤72
|
QHYB90-1.0-150CDL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤100
|
QHYB90-1.2-150CDL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤12
|
QHYB40-0.24-100CDL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤24
|
QHYB40-0.4-100CDL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤36
|
QHYB40-0.6-100CDL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤50
|
QHYB40-0.8-100CDL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤72
|
QHYB40-1.0-100CDL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤100
|
QHYB40-1.2-100CDL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤12
|
QHYB15-0.24-65GDL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤24
|
QHYB15-0.4-65GDL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤36
|
QHYB15-0.6-65GDL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤50
|
QHYB15-0.8-65GDL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤72
|
QHYB15-1.0-65GDL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤100
|
QHYB15-1.2-65GDL-3
|
Users can select appropriate models according to the parameters provided. |
||||||
OEM & Custom Solutions
Chaodun Pump offers OEM and ODM customization for QHYB-GDL systems, including pump selection, control configuration, pressure tank sizing, and material customization for residential, industrial, or municipal water systems.
FAQs for Oversea Buyers
Q1: What is the QHYB-GDL system used for?
It provides automatic constant pressure water supply for domestic, industrial, and fire protection systems.
Q2: What type of pump is used?
It uses GDL vertical inline multistage centrifugal pumps.
Q3: What are the main advantages?
Energy saving, low noise, compact design, and automatic control.
Q4: Can it handle variable flow rates?
Yes, the system automatically adjusts speed and pressure.
Q5: Is it suitable for firefighting?
Yes, it supports firefighting and sprinkler systems with stable pressure output.
Q6: What materials are used?
High-grade stainless steel and corrosion-resistant alloys for durability.
Q7: Does Yitie Pump provide OEM customization?
Yes, complete OEM and ODM customization services are available.