With the advancement in secondary water supply pressure control technology, variable frequency water supply fundamentally resolves this issue. Variable frequency water supply equipment does not require the construction of water towers, has a small investment, occupies less land area, and utilizes automatic water-gas regulation, achieving energy saving and integration with tap water supply. It can still supply water during power outages and does not require monitoring during debugging. It saves 70% of the investment in building water towers, 60% in constructing high-standard water tanks, and a significant amount of civil engineering investment.

The Variable Frequency Constant Pressure Water Supply System is an efficient and energy-saving secondary water supply device. It can achieve stepless speed regulation based on changes in pipeline water usage and pressure, through processes such as microcomputer detection, operation, and feedback, maintaining constant pipeline water pressure to meet water demand. Compared with traditional water towers, high-rise water tanks, and pneumatic water supply equipment, it has significant advantages in terms of water quality, construction costs, operational economy, system reliability, and intelligence.

When water network pressure fails to meet demand, the system's pressure signal is fed back to the variable frequency controller via a remote pressure gauge. While the pump is running, constant pressure variable-speed water supply adjusts automatically based on water usage. If the operating pump reaches the working frequency, the variable frequency operation of another pump is initiated. During peak water supply periods, when the network water volume is less than the pump flow rate, the water in the regulating tank serves as a supplementary water source and continues to be supplied normally. At this time, air enters the regulating tank through a vacuum dust collector to ensure that the network does not experience negative pressure.

During water main shutdowns, the level in the stable water tank drops, triggering the level sensor to send a signal to the variable frequency controller, automatically stopping the pump to protect the pump unit. At night when water supply flow is low and the pipeline pressure fails to meet requirements, the air tank can store and release energy, thus avoiding frequent pump startups.