Maintenance and care measures that must be understood after using the valve

Valves should be stored in an orderly manner; small valves should be placed on shelves, while larger valves can be arranged neatly on the floor of the storage area. They must not be piled up haphazardly, and the flange surfaces must not come into contact with the ground. 　　For valves that will not be in use in the short term, it is best to remove the asbestos packing to prevent electrochemical corrosion that could damage the valve stem. 　　Valves that have just arrived in the warehouse need to be inspected; if rainwater or dirt has gotten inside them during transportation, they must be wiped clean before being stored. 　　The inlet and outlet of the valve should be sealed with wax paper or plastic sheets to prevent dirt from getting in. 　　The machined surfaces of valves that are prone to rusting in the atmosphere should be coated with anti-rust oil for protection. (Most valve manufacturers are capable of carrying out the above tasks; if they don’t, consider switching to another supplier next time.) Valves installed outdoors must be covered with materials such as tarps or sheets to protect them from rain and dust. The warehouse where valves are stored should be kept clean and dry.

Valve use and maintenance: The threads on the valve stem come into frequent contact with the valve stem nut; it is necessary to apply a little yellow grease, molybdenum disulfide, or graphite powder to serve as a lubricant. For valves that are not opened and closed frequently, it is still necessary to rotate the handwheel regularly and apply lubricant to the valve stem threads to prevent seizing. For outdoor valves, a protective cover should be installed on the valve stem to prevent rain, snow, dust, and rust from causing damage. 　　If the valve is of mechanical type, lubricant should be added to the gearbox on a regular basis. Keep the valves clean at all times. (For issues with the transmission, consult the manufacturer; check its grade and determine how often it needs to be refueled.) It is necessary to regularly inspect and maintain the integrity of the valves and other components. If the fixing nut of the handwheel comes loose, it must be replaced with a proper one; makeshift solutions should not be used, as this will wear out the square portion at the upper end of the valve stem, gradually reducing the reliability of the fit and eventually preventing the valve from being operated. 　　Do not rely on the valve to support other heavy objects, and do not stand on the valve. 　　The valve stem, especially the threaded portion, should be wiped regularly, and any lubricant that has become contaminated with dust should be replaced with fresh lubricant, as dust contains hard particles that can easily wear down the threads and the surface of the valve stem, thereby reducing its service life.

Maintenance of valve packing When valves leave the factory, in order to ensure the elasticity of the packing, they are generally tested under static conditions to verify that there are no leaks. After the valve is installed in the pipeline, leakage may occur due to factors such as temperature; in such cases, it is necessary to tighten the nuts on both sides of the packing gland promptly. As long as there is no leakage, that’s sufficient. If leakage occurs again, tighten them further, but avoid over-tightening at once, so as not to cause the packing to lose its elasticity and its sealing capacity. 　　Some valve gaskets contain molybdenum disulfide lubricant; after several months of use, it is necessary to apply the appropriate lubricant. When it becomes apparent that more gasket material is needed, it should be added promptly to maintain its sealing performance.

As a supplementary note, when tightening the nuts, it is necessary to ensure even distribution of force; it is advisable to carry out the tightening in half-turns at a time. We are a fluorocarbon-lined valve manufacturer: handshake