Water supply equipment plays a crucial role in addressing daily water pressure issues. It is widely used in high-rise residential complexes, schools, factories, hotels, inns, and rural areas, among others. The choice of water supply equipment varies according to customer needs, and different manufacturers have different standards for categorizing such equipment.

I believe many of you are familiar with secondary water supply! The tap water we use in our daily lives is transported to our homes through pipes. The water transported through pipes is generally under pressure; when tap water leaves the waterworks, it is pressurized to 0.38 MPa, which can lift the water to a height of 38 meters. Therefore, for floors below this height, theoretically, the water from the waterworks can directly flow into residential homes through the pipes.

But some terrains are different, and as the distance the tap water travels through the pipes increases, the resistance grows, and the achievable height decreases accordingly. Therefore, this 38-meter height line is not parallel to the ground. However, some buildings have floors that are too high, which can lead to insufficient water pressure and prevent the water from continuing to rise. That's why many high-rise buildings initiate secondary water supply. From which floor does the secondary water supply for high-rise buildings start?

Utilize the existing water pressure in the municipal water pipes, compensating as needed; the system stops when the tap water meets the required pressure, achieving a 50% reduction. For instance, in a residential complex with a 6-story building, during peak water usage, the tap water can reach the 4th floor, and during off-peak usage, it can reach the 6th floor. The variable-frequency constant-pressure water supply equipment boosts pressure to the 5-6th floors during peak usage and enters sleep mode during off-peak. In case of power outages, the system can restore normal water pressure, consumes less energy, has low operational costs, is cost-effective, and saves daily electricity expenses.