AVK Supports the Construction of the "Diverse and High-Quality" Drinking Water Security Project in Hefei

In recent years, Hefei City in Anhui Province, with a population of nearly ten million and a regional GDP exceeding 1.2 trillion yuan, has placed higher demands on the security of its "lifeline" water supply due to its rapid and high-quality development. Therefore, with strong support from the Anhui Provincial Water Resources Department, the Provincial Development and Reform Commission, Hefei City, Lu'an City, and various sectors of society, the Longhekou Diversion Project started construction rapidly in October 2021 and is expected to be completed and put into operation by the end of 2023. This project is a significant livelihood project aimed at creating a "diverse and high-quality" water supply pattern for the residents of Hefei City.

The Longhekou Diversion Project is a major strategic interregional water transfer project jointly constructed by Hefei and Lu'an, with a total investment of over 1.5 billion yuan. The designed water transfer capacity is 600,000 cubic meters per day, with 450,000 cubic meters per day allocated to Hefei City and 150,000 cubic meters per day to Shucheng County. This water transfer route starts at Longhekou Reservoir in Shucheng County, Lu'an City, with a diversion point set 18.52 kilometers away. The water is then transferred to Modun Reservoir in Feixi County, Hefei, for intermediate storage and transfer. After pressurization at the Modun Pumping Station and connection to the supporting raw water pipeline, it is introduced into Hefei's Seventh and Eighth Water Plants. Ultimately, it can supply 120 million cubic meters of water to Hefei City every year, benefiting areas such as Hefei Economic and Technological Development Zone, High-tech Zone, and Feixi County.

The water pipeline from Longhekou Reservoir to Modun Reservoir has a total length of 52.66 kilometers and employs a combination of gravity flow and pressurized flow in a single pipe. The upper section of the pipeline, above the booster pump station, utilizes gravity-assisted pressurized water flow and spans 34.75 kilometers. The lower section, where water is pressurized by the source water booster pump station, covers a length of 17.91 kilometers. The entire pipeline has a diameter of DN2400. The project requires the installation of large-diameter flow control valves at the outlet of the gravity pipeline. These valves must possess linear flow control, pressure regulation, and energy dissipation functions at the outlet, while ensuring long-term stable operation under demanding operating conditions.

AVK provided piston-type flow control valves with a diameter of DN2200 for this project. AVK flow control valves are cast as a single integrated unit, featuring streamlined valve body design and axially symmetrical flow channels. Through precise calculations using simulation software, they effectively prevent turbulence, ensuring that no cavitation or valve body damage occurs during operation. They also prevent vibrations and resonance, guaranteeing long-term stable operation across the entire design flow range. Additionally, these valves exhibit an outstanding linear relationship between valve opening and flow. Data from pipeline flow meters, pressure transmitters, and inlet tank level sensors received by the computer control system allow for precise adjustment of the flow control valve's opening.