QHYB-ISG Variable Frequency Water Supply Equipment

QHYB-ISG Variable Frequency Water Supply Equipment

Product Overview (H2) The QHYB-ISG Variable Frequency Automatic Water Supply System (equipped with ISG Vertical Inline ...

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Product Overview (H2)

The QHYB-ISG Variable Frequency Automatic Water Supply System (equipped with ISG Vertical Inline Pump) is a new generation tankless packaged water supply system, consisting of three main modules: pump unit, control system, and pressurization & pressure-stabilizing device.
The water supply capacity is determined by the pump configuration, while the coordinated operation is managed by the control system. The pressurization and pressure-stabilizing device primarily stores energy and maintains pipeline pressure, compensating for small water demands and normal pipeline leaks, forming an essential part of the automatic control function. When water demand increases and the pipeline pressure decreases, the pump will automatically start supplying water.

Model Designation

QHYB ISG Variable Frequency Water Supply Equipment type

Key Features 

  • Tankless system design, integrated pump unit, control system, and pressurization/stabilization device.

  • Two operational modes: Pneumatic (hydraulic pneumatic) mode or Variable Frequency (VFD) mode.

  • Supports parallel pump operation with 1 to 4 pumps (or more), meeting various flow and head requirements.

  • Low-flow optimization: The main pump can alternate with small flow pressurizing/stabilizing pumps to enhance efficiency and reduce energy consumption.

  • Mode-based classifications: Continuous, firefighting, sprinkler, and domestic + firefighting combined modes (as applicable).

Engineering Overview

The QHYB-ISG system uses ISG vertical inline pumps as the core water supply element, with coordinated operation achieved through the control system. Based on operational modes, the system can be configured for pneumatic (hydraulic pneumatic) or variable frequency (VFD) water supply units, each with distinct operating features. Depending on required flow and head, 1 to 4 pumps, or more, can be run in parallel. Under low-flow conditions, the main pump works alternately with small flow pressurizing and stabilizing power units (small flow pumps) to improve efficiency and further reduce energy consumption.

Typical Applications 

QHYB-ISG is widely used in:

  • Domestic (household) water supply.

  • Firefighting water supply.

  • Industrial water supply.

  • Sprinkler/Irrigation systems.

Selection should be based on the water supply mode:

  • Continuous Type: Low flow during the day, or normal pipeline leakage maintaining a minimum flow (e.g., large hotels, restaurants, and industrial/mining system pressurization).

  • Intermittent Type: Longer low-demand periods, with very small or near-zero flow (e.g., small office buildings, commercial residential buildings, various residential buildings, and certain process water systems).

Design should consider flow variations based on time periods, seasonal consumption changes, and regional/application differences.

System Configuration 

The QHYB-ISG uses a complete packaged and automated control integration design. The pump unit, as the core power element, provides the basic hydraulic performance for the system. During normal operation, the system relies on pressure stabilization and small flow auxiliary pumps to compensate for low demand and leakage, reducing frequent start-ups of the main pump and supporting stable operation. The system can match appropriate pumps and parallel pump configurations according to flow and head requirements, ensuring engineering adaptability and operational economy.

Components and Supply

The QHYB-ISG automatic water supply unit consists of:

  • Pump unit (equipped with ISG vertical inline pump).

  • Control system (for coordinated operation, automatic start/stop logic).

  • Pressurization and pressure stabilization device (for energy storage, pressure maintenance, and leakage compensation).

  • Small flow pressurizing and stabilization power unit (small flow pump, used for low-demand conditions).

Technical Service 

The system uses complete packaging with automated control integration, simplifying on-site installation and construction. By relying on pressure stabilization and small flow auxiliary pumps, the system compensates for low demand and leakage, reducing the frequency of main pump start-ups, extending the service life, and ensuring stability. The control system coordinates the operation, reducing manual intervention, and making the system suitable for long-term continuous operation.

Operating Conditions 

The selection of automatic packaged water supply units should be based on the following parameters:

  • Design flow rate.

  • Required supply pressure (head).

  • Flow variation patterns (continuous/intermittent).

  • Flow variation over specific time periods.

  • Seasonal changes in consumption.

  • Regional and application-specific usage conditions.

For firefighting sprinkler applications, pneumatic (hydraulic pneumatic) packaged units are typically recommended. Since the system remains in long-term pressure-maintenance mode, with minimal actual flow variation, this mode compensates for normal pipeline leakage. With the addition of small flow auxiliary pumps, the main pump does not need to start under normal conditions, saving energy.

Service Conditions

  • Applicable to pressure maintenance operations with small water demand and normal pipeline leakage.

  • Low-demand phases are handled by pressure stabilization and small flow auxiliary pumps, reducing the frequency of main pump starts.

  • Configuration can be either pneumatic (hydraulic pneumatic) or variable frequency (VFD) mode to suit different operational characteristics and management requirements.

Protection Features

  • Automated Control Coordination: Automatically starts and stops pumps according to pressure and demand changes.

  • VFD Mode: Provides constant pressure water supply; adjustable pressure settings within a specified range. Pressure control precision is typically 0.02 MPa.

  • Variable Frequency Operation: Compared to traditional pneumatic packaging systems, VFD operation achieves an average energy savings of about 20%.

  • Lower Inrush Current: Reduces inrush current and mechanical/hydraulic shock during VFD start-up; low-speed operation reduces noise.

  • Air-Pressure Mode: Offers lower initial investment, simpler control logic, and convenient maintenance.

Selection Criteria 

System configuration should be comprehensively determined based on the design flow, required head, and water usage fluctuation characteristics:

  • For continuous and intermittent water usage, the pump parallel number and control mode configuration should match the flow and demand.

  • For firefighting sprinkler applications, pneumatic (hydraulic pneumatic) packaged units are recommended. Since the system is in long-term pressure maintenance mode with minimal flow variation, it compensates for normal pipeline leakage. With small flow auxiliary pumps, the main pump need not start under normal conditions, saving energy.

  • Compared to traditional pneumatic systems, VFD mode achieves about 20% average energy savings; air-pressure mode provides lower initial investment, simpler control, and easier maintenance.

Specifications & Installation

Selection Guide

I. Pump selection for variable-frequency constant-pressure 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 packaged water supply unit model
Vertical pump set
Building type
Design sprinkler intensity
(L/min·m²)
Coverage area
(m²)
Production building
10
300
60
0.1
≤12
QHYB60-0.24-100ISG-3
Production building
10
300
60
0.1
≤24
QHYB60-0.4-100ISG-3
Production building
10
300
60
0.1
≤36
QHYB60-0.6-100ISG-3
Production building
10
300
60
0.1
≤50
QHYB60-0.8-100ISG-3
Production building
10
300
60
0.1
≤72
QHYB60-1.0-100ISG-3
Production 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 appropriate models according to the parameters provided.

OEM & Custom

Chaodun Pump provides OEM and ODM customization for QHYB-ISG systems, including pump model selection, control configuration, material optimization, and energy-saving system integration for residential, municipal, and industrial applications.

FAQs

  • Q1: What is the QHYB-ISG system used for?
    It is used for domestic, industrial, and firefighting water supply with constant pressure control.
  • Q2: What type of pump is used?
    ISG vertical inline centrifugal pump.
  • Q3: What are the main advantages?
    Energy efficiency, automatic control, low noise, and long service life.
  • Q4: Can it be used for high-rise buildings?
    Yes, suitable for residential and commercial high-rise applications.
  • Q5: How many pumps can operate in parallel?
    1–4 pumps or more depending on system capacity.
  • Q6: What control method is applied?
    Variable frequency control system with automatic pressure regulation.
  • Q7: Does Chaodun Pump offer OEM customization?
    Yes, full OEM/ODM service for pump selection, control panel, and system design.