Non-Negative Pressure Water Supply Unit
Direct-connection water supply system that connects to municipal water network without elevated tanks. Energy-efficient with intelligent variable frequency control, automatic pressure regulation and high automation. No negative pressure created in the water main.
Key Specifications
| Flow Rate | 6-500 m3/h |
| Head | 10-200 m |
| Working Pressure | Up to 2.0 MPa |
Product Overview
The Non-Negative Pressure Water Supply Unit is an intelligent water supply system that connects directly to the municipal water network without the need for elevated water tanks or reservoirs. The system uses a sealed pressure tank and variable frequency drive technology to boost water pressure while maintaining positive pressure in the municipal supply network, ensuring that the system does not create negative pressure that could cause contamination or service disruption to the water main.
This system is widely used in residential buildings, commercial complexes and industrial facilities in areas with adequate municipal water network pressure. Depending on regional terminology, it may also be referred to as a Non-Negative Pressure Water Supply Equipment, Direct-Connection Water Supply System, Non-Negative Pressure Water Supply Equipment or Non-Negative Pressure Water Supply Unit.
Key Features
- Direct connection to municipal water network eliminates the need for elevated water tanks or reservoirs
- High operating efficiency with optimised hydraulic design and variable frequency speed regulation
- 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
Applications
- Pressurised water supply in areas with adequate municipal water network pressure
- Industrial production and domestic water supply for manufacturing facilities
- Large water treatment plant intermediate pressure boosting stations
- Water supply secondary pressurisation systems
- New and renovated residential buildings, office complexes, hotels and commercial building domestic water supply
- Municipal water network pressure boosting applications
Customer Benefits
No Water Tank Required
The direct connection to the municipal water network eliminates the need for elevated water tanks or reservoirs, reducing construction costs, eliminating water quality degradation associated with storage tanks and minimising the system footprint.
High Energy Efficiency
The variable frequency drive adjusts pump speed based on actual water demand, reducing energy consumption by utilising the existing municipal network pressure as a baseline, achieving significant energy savings compared to traditional pumping systems.
Constant Pressure Delivery
The intelligent control system maintains constant system pressure regardless of demand fluctuations, ensuring consistent water pressure to all outlets while preventing negative pressure in the municipal network.
Compact Space-Saving Design
The integrated system configuration requires minimal installation space compared to traditional water tank and pump room 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.
Versatile Application Coverage
With flow rates up to 500 m3/h and heads up to 200 m, the system covers residential, commercial and industrial water supply requirements in areas with adequate municipal water network pressure.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Non-negative pressure water supply unit |
| Flow Rate | 6-500 m3/h |
| Head | 10-200 m |
| Temperature Range | Up to 80 degrees C |
| Working Pressure | Up to 2.0 MPa |
| Control Mode | Automatic variable frequency with non-negative pressure control |
Selection Guidance
To select the appropriate non-negative pressure water supply unit, please provide the following information:
- Required flow rate (m3/h)
- Required system pressure (MPa or bar)
- Municipal water network pressure (available baseline pressure)
- Number of pump units required
- Building type and occupancy classification
- Available voltage and frequency
- Installation space constraints
Final model selection should be confirmed according to the actual system requirements, municipal network pressure 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 connection must be directly connected to the municipal water network with an appropriately sized isolation valve. The 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
- Municipal water network inlet connection is complete and leak-free
- 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
- Checking that the system maintains positive pressure in the municipal network
Available Configurations
- Flow rates from 6 to 500 m3/h
- Heads from 10 to 200 m
- 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 non-negative pressure control
FAQs
What is a non-negative pressure water supply unit?
It is an intelligent water supply system that connects directly to the municipal water network without the need for elevated water tanks or reservoirs, boosting water pressure while maintaining positive pressure in the municipal supply network.
What is the flow range?
The system offers flow rates from 6 to 500 m3/h, suitable for small to large water supply applications.
What is the head range?
Available heads range from 10 to 200 m.
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, industrial water supply and municipal water network pressure boosting applications.
Why use a non-negative pressure system?
The non-negative pressure system eliminates the need for elevated water tanks, reduces construction costs, prevents water quality degradation associated with storage tanks and utilises existing municipal network pressure to achieve significant energy savings.
Where can this system be used?
It is suitable for areas with adequate municipal water network pressure, including residential buildings, commercial complexes, industrial facilities, water treatment plant intermediate stations and municipal water network pressure boosting applications.
Contact Chaodun
For product selection, technical data, performance information or project quotations, please contact Shanghai Chaodun Machinery Manufacturing Group Co., Ltd.
Website: https://chaodunpump.com
Email: Suzion@chaodunpump.com
WhatsApp: +44 751 8050 473