Product Overview

The Constant-Pressure Variable Frequency Water Supply System is an intelligent water supply solution that uses variable frequency drive (VFD) technology to maintain constant water pressure regardless of demand fluctuations. By continuously adjusting pump speed based on real-time pressure feedback from the distribution network, the system delivers stable water pressure to all outlets while minimising energy consumption.

This system is widely used in residential communities, commercial complexes, hotels and industrial facilities. Depending on regional terminology, it may also be referred to as a Constant-Pressure Water Supply Equipment, VFD Constant-Pressure System or Constant-Pressure Variable Frequency Water Supply Equipment.

Key Features

• High operating efficiency with optimised hydraulic design and VFD speed regulation for energy savings of 20-50 percent
• Intelligent variable frequency control maintains constant system pressure under varying demand conditions
• Compact footprint with straightforward installation requirements for retrofit and new construction projects
• High level of automation with PLC-based control and intuitive HMI interface for real-time monitoring
• Personalised design configuration optimised for specific project requirements
• Wide application range covering residential, commercial and industrial water supply

Applications

• New residential community and villa domestic water supply
• Office building and commercial complex water supply
• High-end hotel and restaurant water supply systems
• Traditional ground-level water tank pressure boosting system renovation
• Boiler cold water supply systems
• Municipal water secondary pressure boosting
• Industrial production and domestic water supply for manufacturing facilities
• Circulating water and cooling water supply systems
• Domestic water pressure boosting where municipal pressure is insufficient

Customer Benefits

High Energy Efficiency

The variable frequency drive adjusts pump speed based on actual water demand, reducing energy consumption by 20-50 percent compared to traditional constant-speed pump systems.

Constant Pressure Delivery

The intelligent control system maintains constant system pressure regardless of demand fluctuations, ensuring consistent water pressure to all outlets and eliminating pressure-related complaints from building occupants.

Compact Space-Saving Design

The integrated system configuration requires minimal pump room space compared to traditional water tower or elevated tank systems, making it suitable for installations with limited space.

High Automation Level

The PLC-based control logic and HMI interface provide automated pump operation, fault diagnosis and system monitoring, reducing the need for manual intervention and on-site supervision.

Personalised Project Configuration

Each system is configured according to specific project requirements including flow rate, pressure, pump quantity and control logic, ensuring optimised performance for each application.

Versatile Application Coverage

With flow rates up to 500 m3/h and pressures up to 2.7 MPa, the system covers residential, commercial and industrial water supply requirements.

Technical Specifications

Parameter	Specification
Product Type	Constant-pressure variable frequency water supply system
Flow Rate	0-500 m3/h
Pressure	0.10-2.7 MPa
Temperature Range	Up to 80 degrees C
Working Pressure	Up to 2.0 MPa
Control Mode	Automatic variable frequency with constant-pressure control

Selection Guidance

To select the appropriate constant-pressure variable frequency water supply system, please provide the following information:

• Required flow rate (m3/h)
• Required system pressure (MPa or bar)
• Number of pump units required
• Building type and occupancy classification
• Available voltage and frequency
• Installation space constraints
• Operating conditions and duty cycle

Final model selection should be confirmed according to the actual system requirements and project conditions.

Installation and Maintenance

Installation Guidance

The system should be installed on a level, stable foundation with adequate clearance for inspection and maintenance. The inlet and outlet piping must be properly supported to prevent load transfer to the pump connections. Electrical connections must be made by qualified personnel.

Pre-Start Inspection

Before commissioning, confirm the following:

• System is securely mounted and level
• Inlet and outlet piping connections are complete and leak-free
• Electrical connections are correct and terminals are secure
• VFD parameter settings are configured for the required system pressure
• Pressure transmitter is properly calibrated
• All valves are correctly positioned for normal operation

Routine Maintenance

Regular inspection should include:

• Checking VFD parameter settings and fault history
• Monitoring pump performance and pressure output
• Inspecting mechanical seals for leakage
• Verifying pressure transmitter calibration
• Inspecting all piping connections for signs of leakage

Available Configurations

• Flow rates up to 500 m3/h
• Pressures up to 2.7 MPa
• Temperature range up to 80 degrees C
• Working pressure up to 2.0 MPa
• Single pump to multi-pump configurations
• Integrated control panels with automatic constant-pressure control

FAQs

What is a constant-pressure variable frequency water supply system?

It is an intelligent water supply system that uses variable frequency drive (VFD) technology to maintain constant water pressure regardless of demand fluctuations, delivering stable water pressure while minimising energy consumption.

What is the flow range?

The system offers flow rates up to 500 m3/h, suitable for small to large water supply applications.

What is the pressure range?

Available pressures range from 0.10 to 2.7 MPa.

What liquids can this system handle?

It is suitable for clean water with temperatures up to 80 degrees C, making it suitable for domestic water supply, boiler cold water supply and cooling water applications.

Where can this system be used?

It is widely used in residential buildings, commercial complexes, hotels, industrial facilities, municipal water secondary pressure boosting and cooling water supply systems.

Why use variable frequency control?

Variable frequency control adjusts pump speed based on actual water demand, reducing energy consumption, eliminating pressure fluctuations and extending pump and motor service life.

Contact Chaodun

For product selection, technical data, performance information or project quotations, please contact Shanghai Chaodun Machinery Manufacturing Group Co., Ltd.

Website: https://cd-pump.cc

Email: Suzion@cd-pump.com

WhatsApp: +44 751 8050 473