First Choice Of Municipal Water Supply: Introduction Of Double-port Flanged Ball Valve For Zero Pollution Control Scheme Of Direct Drinking Water System

Urban drinking water system is an important guarantee of urban water supply security, its water quality directly affects the health of residents. However, the formation of biofilms and the risk of secondary contamination in the lining of pipelines have long plagued the industry. The double-flange ball valve has its high sealing performance, corrosion resistance and intelligent control capabilities. It has become the core equipment of zero pollution control in direct drinking water system. Based on the practical experience of Fujian Senke and Zhejiang Detson in the field of urban water supply, this paper systematically expounded the wholeprocess pollution control scheme of the double-flange ball valve in direct drinking water system.
I. Pollution risk analysis of direct drinking water systems
1.1 Biofilm: Hidden Sources of Pollution
The main cause of microorganism overload in direct drinking water systems is the formation of biofilm in the inner wall of pipe. Biofilms are composed of microorganisms, polysaccharide matrices and inorganic substances. Once formed, traditional disinfection methods,such as chlorine-based disinfectants, are difficult to remove completely. For example, a school's direct drinking water system was contaminated with norovirus due to the accumulation of biofilms, causing diarrhoea in a group of people, highlighting the limitations of traditional methods of disinfection.
1.2 Medium Corrosion and secondary contamination
Direct drinking water system need long-term resistance to corrosive environments such as residual chlorine and pH value fluctuations. Ordinary valves are prone to media leakage due to seal failure or material corrosion. In one residential area, for example, a valve lining for a direct drinking water pipeline came off, causing excessive iron ions and yellowing water quality, leading to a sharp increase in complaints from residents.
ii. Control Technology System for Double-Port Flange Ball Valves
2.1 Material Selection: Corrosion Resistance Dual Assurance and food Grade Certification
Body material: ductile iron, epoxy resin anti-corrosion coating. Compared with conventional carbon steel, the erosion resistance of chlorine ion increased by 60%. Lead content is less than 0.15%, meeting NSF/ANSI 61 drinking water standards. For example, a ball valve custom-made by Fujian Senke for the Xiamen municipal direct drinking water project operated at residual chlorine level of 1.2 mg/L.
Sealing Structure: Double safety design "Teflon-lined sealing + nitrile rubber auxiliary sealing" with leakage rate ≤ 1×10−6 MPa·m3/s, well below municipal standards. Microsphere valve (DN15-DN50) provided by Zhejiang Dexin Electronics semiconductor laboratory, food-grade PTFE lining with surface roughness ≤ 0.8 μm and no media residue.
2.2 Intelligent control: Millisecond Response and closed-loop management
Actuator Integration: Support Modbus and 485 dual communication protocols, positioning accuracy ± ±0.3%, seamless integration with SCADA systems. For example, Topcheng Automation Control provided an integrated solution of "Valve + Sensor + Control Cabinet" for new energy plants in the Yangtze River Delta, allowing real-time monitoring of flow and pressure, and failure warning response time of less than 0.5 seconds.
Remote maintenance: Upload operation data via IoT platform and combine AI algorithms to predict the lifespan of sealing components. Fujian Detson has set up an anticorrosion file system for CNG nuclear power project, which can trace valve life cycle data and reduce maintenance cost by 40%.
2.3 Disinfection Synergy: Targeted Biofilm Removal Technologies.
Novo Disinfectant联动: For biofilm issues, use a a "hydrogen peroxide + silver ion" compound sanitizer. It penetrates the biofilm matrix in 10 minutes and has a 99.999% inactivation rate for norovirus and Legionella. For example, the introduction of the solution in the direct drinking water system of level III hospitals reduced microbial indicators from 20 times the standard level to a safe range with no residual chlorine.
Pulsed Rinse Process: combine with the quick opening and closing function of the double-port flange ball valve, carry out high pressure pulse rinse to remove loose biofilms in the inner wall of pipeline. The biofilm thickness dropped from 0.5 mm to less than 0.1 mm after the process was introduced to an airport's direct drinking water system.
III. Typical Application Scenarios and Effect Verification
3.1 Direct urban drinking water network: Xiamen Case
Project Background: The Xiamen municipal direct drinking water system provides water to 2 million residents and has a pipe network of more than 3,000 km in length. Corrosion under perchlorated water conditions (residual chlorine 1.0 -1.5 mg/L) needs to be addressed.
Solution: Fujian Senco Custom ball valve with increased coating thickness to 300 μm and the flange sealing surface roughness ≤ Ra0.8.
Implementation Effect: after 3 years of operation, the leakage rate is less than 0.001%, the pipeline water quality pass rate has been raised from 92% to 99.8%, saving more than 5 million yuan annually in maintenance costs.
3.2 Campus Direct Drinking Water System: The Case of Shanghai University
Background: The university's direct drinking water system, which serves 50,000 students and staff, was closed for three days due to a norovirus outbreak linked to biofilm contamination.
Solution: Replace ball valve provided by Zhejiang Detson (DN25) with a matching Novo disinfection pulse flushing system and integrate the flow monitoring module in the actuator.
Implementation Effect: Microbiological indicators remained within standard range for 12 months, disinfection frequency was reduced from 3 times per week to 1 time per month, and maintenance labour costs were reduced by 70%.
IV. INTRODUCTION Full Life Cycle Management Closed-Loop System
4.1 Digitalization of antiseptic files.
Data collection: Record more than 20 parameters such as valve model, material, operating temperature, pressure, media composition, and links to historical maintenance records and test reports.
Dynamic analysis: The residual lifespan of valve is predicted by using digital twin technology to simulate the stress distribution of valve. For example, after 8,000 hours of operation of a ball valve in a nuclear power project, the model predicted a residual life of 2,000 hours for the sealing component, which was replaced in advance to avoid leakage accidents.
4.2 Predictive Maintenance Strategy
Fault prediction model: based on LSTM neural network, input pressure, temperature, vibration and other 10-dimension characteristics, output is fault probability. When applied to chemical projects, maintenance costs were reduced by 40% and spare parts inventory turnover rate increased by 25%.
Grading maintenance mechanism:
Mild wear: Online maintenance to avoid downtime
Moderate damage: scheduled downtime to replace seals;
Serious malfunction: immediately shut down maintenance to prevent the accident from spreading.
V. Future Outlook: Integration of Intelligence and Ecologicalization
With the deep integration of industrial Internet and artificial intelligence technology, the dual-flange ball valve will develop in the following directions:
Autonomouslearning system: equipped with artificial intelligence chip, can optimize control parameters in real time;
(a) Blockchain traceability: the use of blockchain technology record valve all lifecycle data to ensure that data cannot be tampered with;
Ecological collaboration: the integration of upstream and downstream equipment (such as water pumps, water quality sensors, etc.) to build intelligent fluid control system. Conclusion:
Through material innovation, intelligent control and disinfection synergy, The disinfection synergy ball valve complete closed loop of zero pollution control in direct drinking water system is established. From the large-scale application of water supply network in Xiamen city to the accurate prevention and control in Shanghai universities, its value has been fully verified. In the future, with the continuous iteration of technology, the double-port flange ball valve will become the "digital guardian"of urban water supply security, promoting the intelligent and ecological upgrading of urban water water supply and water affairs supply.