Recently, to ensure the safe and stable operation of natural gas transmission pipelines and water diversion projects, multiple management stations have conducted comprehensive regular maintenance on valves. As key equipment, the reliability and lifespan of valve operations are crucial to the overall system's functioning. During regular valve maintenance, the following points should be noted to ensure the safety and efficiency of the maintenance work.

   Before valve maintenance, a detailed maintenance plan and scheme must be developed. Relevant engineering management personnel and operation and maintenance staff should jointly learn about the working principles of valves, operational procedures, and other related content, and based on issues identified during preliminary disassembly checks and daily inspections, formulate targeted maintenance and care plans. This helps clarify the preparatory work before maintenance, safe operational procedures, and technical requirements, ensuring the orderly conduct of maintenance work.

   During the maintenance process, special attention should be paid to safety issues. For pipelines and valves maintained on high platforms, protective measures should be taken to prevent falls. If flange seals leak while the pipeline and valves are in operation, it is strictly prohibited to tighten bolts under pressure. In the event of a leak of toxic or harmful substances, preventive measures should be taken, followed by troubleshooting and reporting to superiors.

    In addition, before maintenance, pipelines and valves should be depressurized, cleaned, cooled to below 60°C, replaced, and ventilated. Maintenance on pipelines with unclear conditions is strictly prohibited. For pipelines transporting flammable, explosive, toxic, or harmful substances, blind flanges must be installed after depressurization, and only after replacement, cleaning, and passing analysis can maintenance proceed. If harmful substances may be generated during maintenance, gas analysis should be conducted as per regulations, continuous ventilation should be maintained during maintenance, and a dedicated person should supervise, with emergency equipment prepared.

    When disassembling and installing valves, operations should be conducted according to the valve maintenance manual or instructions, paying attention to the wear capacity of the valve mechanism, and using tools correctly to prevent safety accidents caused by improper operations. Additionally, drainage treatment should be conducted before disassembling the valve to avoid threats to the environment and personnel from residual substances or debris in the valve.

   After maintenance is completed, the valve should undergo trial operation and inspection to ensure that its performance and usage meet requirements. Key information and data from the maintenance process, such as maintenance time, replaced parts, and maintenance results, should be recorded. Any problems and difficulties encountered during maintenance should be promptly communicated and reported to seek help or improve maintenance methods.

   Moreover, the maintenance and upkeep of valves are also very important. Regular cleaning, checking operational flexibility, sealing performance, and anti-corrosion coatings of valves should be conducted to timely identify and address potential issues. For valves operating in high ash, high temperature, and high corrosion environments, maintenance work should be emphasized to ensure the normal operation of the equipment.

   Through this regular valve maintenance work, not only has the safety and stable operation of equipment facilities been enhanced, but the professional skill level of frontline personnel has also been improved through a 'learning + practical operation' model. This series of measures has laid a solid foundation for the safe and smooth operation of natural gas transmission pipelines and water diversion projects.

   Regular valve maintenance is a complex and important task that requires joint efforts from all parties to ensure the safety and efficiency of the maintenance work. Only by strictly following maintenance procedures and paying attention to safety matters can the long-term stable operation of valve equipment be ensured, providing strong support for social production and life.