The Variable Frequency Constant Pressure Water Supply Equipment is a new type of energy-saving water supply system. This equipment utilizes the advanced microcomputer control technology of today, combining a variable frequency speed regulator with an electric motor and pump to create an integrated high-tech energy-saving water supply unit. The Variable Frequency Constant Pressure Water Supply Equipment sets the water pressure at the pump outlet (or the water flow rate used by the user) as the control parameter. It regulates the speed of the pump motor by automatically controlling the output frequency of the variable frequency inverter, achieving closed-loop regulation of the water pressure in the user's pipeline network, and maintaining the water supply system at a constant pressure as set: when the water usage increases, the frequency rises, and the pump speed accelerates; when the water usage decreases, the frequency drops, and the pump speed slows down. This ensures that the entire user pipeline network always has sufficient water pressure (consistent with the pressure set by the user) and water volume (which changes according to the user's water usage).

Variable Frequency Constant Pressure Water Supply Equipment Composition

The Variable Frequency Constant Pressure Water Supply Equipment is primarily composed of a pump unit, pressure regulating tank, pressure sensor, and variable frequency control cabinet, which can always maintain the pressure gauge pressure (i.e., the water pressure in the user's pipeline) equal to the user's set value. It is suitable for general domestic or industrial water supply. The composition methods of the water supply system include:

1. Variable-frequency water supply equipment integrates with the municipal pipeline network for constant-pressure water supply. When the water pressure meets the requirements, all pumps automatically shut down. Otherwise, the constant-pressure water supply equipment starts up to increase pressure to meet the water usage demands.

2. To completely eliminate water consumption for low or zero flow supply, auxiliary small pumps or auxiliary air pressure tanks can be added. When the water supply pressure is low, the main pump will automatically shut down, allowing the auxiliary pump or air pressure tank to operate.

Variable Frequency Constant Pressure Water Supply Equipment Features

Variable Frequency Constant Pressure Water Supply Equipment with No Negative Pressure

Direct connection and pressurized operation of the system to the municipal water pipeline will not cause negative pressure in the municipal tap water pipeline.

② Variable Frequency Constant Pressure Water Supply Equipment Pressure Setting

By adjusting the permit pressure control valve, the permitted water intake pressure in the municipal water supply network can be set.

③ Variable frequency constant pressure water supply equipment using pressure (or superimposed pressure)

When exceeding the permitted suction pressure and flow rate, the system can boost pressure based on the municipal water supply network pressure. Compared to drawing water from a standard reservoir, the operation can reduce the number of pump units or (and) lower the rotational speed to achieve energy-saving goals.

④ Variable Frequency Constant Pressure Water Supply Equipment

The equipment detects the outlet pressure in real-time through sensors, compares the detected value with the set value, and determines the number of motor and pump sets to be engaged and the frequency output of the variable-frequency drive (which translates to the rotational speed for the motor and pump) to match the water usage curve and achieve constant pressure.

Variable Frequency Constant Pressure Water Supply Equipment Applications

New residential communities, villas, office buildings, and mixed-use buildings are now supplied with living water.

Life water supply for high-rise buildings, fire-fighting, and high-end hotels and restaurants.

Traditional water supply system upgrades, including pressure boosting for groundwater and ground-level reservoirs.

◆ Various boiler cold water supply systems, boiler hot water.

Waterworks intermediate pressure pump station, secondary water boosting.

◆ Production and domestic water supply, pipeline pressure stabilization for various industrial and mining enterprises.

◆ A variety of circulating water and cooling water supply systems.

Unsurpassed Pressure-Free Water Supply Equipment

The pressure-free water supply equipment is composed of three parts: an air tank, a pump, and an electrical control system. Its distinctive features include the absence of the need for a water tower, small footprint, flexible layout, and rapid construction and commissioning. It utilizes automatic water-gas regulation, automatic operation, energy saving, and automatic integration with tap water, ensuring water supply even during power outages. Once adjusted, it requires no supervision. It is widely used for production, living, and office water supply in institutions, residential areas, and rural settings. Suitable for locations with up to 5,000 water users and daily water supply of up to 3,000 m³, with a supply height exceeding 100 meters. Typically installed on the ground or in basements. Units with tap water can use the pressure-free water supply equipment to regulate peak water usage, increase water pressure, and meet the demands of large areas and high-rise buildings during peak times. For units, factories, or rural areas without tap water, simply connecting the equipment to the water and power sources provides a stable water supply and pressure, meeting their water needs. Compared to traditional water supply equipment, this device saves up to 3 to 16 times more space and reduces the cost of building a water tower by 15% to 60%. The equipment is compact, easy to assemble, install, and debug, with a short transportation and installation period. The pressure-free water supply equipment offers comprehensive protection functions, ensuring safe and reliable operation with easy handling. The main unit employs a variable frequency speed regulator, which has protection features against under-voltage, over-voltage, overcurrent, overload, short circuit, overheating, and loss of speed, with a fault-free operation of over 100,000 hours. The electrical control section uses intelligent control principles, making operation straightforward and practical, with the equipment's working status being easily visible, facilitating quick mastery by non-specialists.

The pressure-free water supply equipment boasts comprehensive functions and high safety coefficients. In the event of a localized fault, it can activate emergency primary functions to continue water supply. The equipment can automatically connect to the municipal water supply network and features dual variable-frequency primary functions, ensuring both normal pressure and flow for domestic and production water needs. It can automatically switch to high-pressure, high-flow water supply in case of fire emergencies, serving multiple purposes with a single unit.

Unsurpassed Pressure-Free Water Supply Equipment Installation

Equipment installation should be conducted in a well-ventilated, dust-free, and dry location with an environmental humidity ranging from -10℃ to 40℃. Outdoor installations should be equipped with rain and lightning protection measures.

After selecting the site, the foundation must be properly prepared, either by concrete pouring or by brick and stone masonry for the tank support base. Once the base is fully cured, the tank is hoisted and stabilized, followed by the installation of equipment accessories and power connection.

Unsurpassed Pressure-Free Water Supply Equipment Usage Method

Before testing, the water supply valve should be closed and all sealing valves checked for any leaks. After starting the equipment, pay attention to the direction of the pump operation. When the pressure gauge needle reaches the upper limit, the pump will automatically stop. Open the water supply valve to resume normal water supply. To provide water on a timed basis, turn the selector switch to the manual position.

Unsurpassed Pressure-Free Water Supply Equipment Main Functions

The fully automatic completion of the entire operation process, including soft starting multiple pump units, variable frequency to industrial frequency operation, and stopping.

2. The start and stop of multiple pump units are adjusted according to the fluctuation in water usage.

3. The primary function of the LED display for set pressure values and actual pressure values.

4. LED frequency indicator, variable frequency abnormality indicator, and motor fault condition display.

5. Protection Features: Equipped with main functions such as under-voltage protection, over-voltage protection, overload protection, short-circuit protection, stall prevention, burn prevention, etc.

Non-negative pressure water supply equipment application scope

Users of water from the public water supply system. For instance: high-rise buildings and residential communities that draw water from underground or reservoirs. Examples include users who directly extract water from below using submersible or deep-well pumps. The boiler feed water system with variable frequency pressure regulation is reliable in performance, simple in structure, convenient to operate, cost-effective, and is widely used in industrial and mining enterprises, towns, rural areas, and other small to medium-sized water supply systems. It is particularly suitable for situations where the water source is from self-owned wells, underground reservoirs, and reservoirs.

Unsurpassed Pressure-Free Water Supply Equipment Variable Frequency Control Principle

Implementing constant pressure water supply through variable frequency speed regulation is significantly more energy-efficient compared to using regulating valves (the energy-saving effect can be calculated based on specific conditions).

The product's distinctive features are:

The starting balance ensures that the starting current can be confined within the rated current, thereby avoiding any impact on the power grid during startup.

2. Due to the reduced average pump speed, the lifespan of pumps and valves, among other components, can be extended.

Eliminates water hammer effect during startup and shutdown.

Generally speaking, when a variable-frequency inverter controls a motor, it is sufficient to match the inverter's rated motor capacity with the actual motor capacity. When a variable-frequency inverter controls two motors simultaneously, the inverter's rated motor capacity should ideally equal the sum of the two motors' capacities. However, if the water usage during peak load is significantly different from the full-speed supply of both pumps, it may be considered to reduce the inverter's capacity appropriately, but enough capacity should be maintained for operational considerations.

Principle of Operation for Non-negative Pressure Water Supply Equipment

The regulating control system is composed of a variable-frequency inverter, a remote pressure gauge, and regulators, while the actuating mechanism is jointly formed by circuit breakers, contactors, etc., to create a complete constant-pressure variable flow water supply system. Status of the two pumps: Pump 1 operates in variable-frequency mode, with the frequency increasing to a set value to reach the set pressure. At this point, the variable-frequency device operates in a constant-pressure state. When water usage increases, the pressure drops; after the pump maintains a certain frequency for a period, it fails to reach the set pressure and automatically switches to Pump 1's fixed-frequency operation, initiating Pump 2's variable-frequency operation. When water usage decreases, Pump 1 shuts down, and Pump 2 operates in variable-frequency mode, increasing the frequency to a set value to maintain the set pressure, thereby achieving the effect of constant pressure and variable flow.

Unsurpassed Pressure-Free Water Supply Equipment Features

The pressure-free water supply equipment operates with microcomputer full-automatic control and variable frequency speed regulation. In the event of a power outage, the equipment automatically shuts down, and it restarts automatically upon power restoration, achieving full automation.

2. The equipment features a multi-stage stainless steel pressure pump, with the pump casing, impeller, and main components all manufactured from food-grade stainless steel. It boasts smooth flow, energy-saving, stable operation, extremely low noise, and superior overall performance, making it an ideal green and energy-saving water supply equipment.

3. No need for constructing ponds or water tanks, nor the installation of large air pressure vessels, resulting in significant cost savings. Moreover, the full utilization of the existing water supply network's pressure is achieved.

4. The water supply system, from the public water network to the faucet, is fully enclosed to ensure no contamination. Pollutants do not enter the system, and the water does not come into direct contact with air. The filtration components are made of food-grade stainless steel, eliminating any chance of secondary pollution, ensuring environmental protection and hygiene.

5. Significant energy-saving effects; equipment directly connects to the main water supply pipeline, adding the required pressure on top of the pressure from the waterworks' initial supply network. Compensate for the difference; fully utilize the pressure of the pipeline. During off-peak water usage hours, the equipment may not need to operate at all. Compared to traditional water supply equipment, energy savings can reach 30%-90%.

6. Conserve water resources; no regular cleaning and disinfection required; prevent water and labor waste. Save on maintenance costs.

7. The small land footprint requires no construction of reservoirs or water tanks, and no large air pressure tanks are needed, significantly reducing the system's land area. This saved land can be utilized to enhance property utilization, aligning with the national land-saving requirements.

Installation is easy, requiring only the connection of in and out water pipes, with a short construction period and simple setup.

9. Stable operation, low vibration, and minimal noise (noise level below 50 decibels).

The system water supply is stable, fully ensuring the pressure at the system's terminal.

11. Optional automatic inspection feature to reduce property management costs.

The system operates fully automatically with PLC programmable control, offering convenient operation and maintenance.

13. Integrated professional design, compact structure, low investment, easy installation, and aesthetically pleasing appearance.

By utilizing the superposition of pipeline pressure and the automatic variable frequency operation mode, energy-saving effects are remarkable.