There are two situations for valve maintenance: one is storage and maintenance, and the other is maintenance.

       The purpose of storage and maintenance is to prevent the valve from being damaged during storage or to reduce the quality. In fact, improper storage is one of the important reasons for valve damage.

       The valves should be kept in a well-organized manner. Small valves should be placed on the shelves. Large valves can be arranged neatly on the floor of the warehouse. Do not stack them randomly. Do not let the flange connection surface contact the ground. This is not only for aesthetics, but mainly to protect the valve from damage.

       Due to improper storage and handling, broken handwheels, bumped valve stems, loosening and loss of fixed nuts between handwheels and stems, etc., these unnecessary losses should be avoided.

       For valves that will not be used for a short period of time, asbestos packing should be removed to avoid electrochemical corrosion and damage to the valve stem.

       Valves that have just entered the warehouse must be inspected. If rain or dirt is introduced 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 sheet to prevent dirt from entering.

       Protect the machined surface of the valve that can rust in the atmosphere with anti-rust oil.

       Outdoor valves must be covered with rainproof and dustproof items such as linoleum or tarpaulin. The warehouse where the valves are stored should be kept clean and dry.

       Use and maintenance

       The purpose of maintenance is to extend the life of the valve and ensure reliable opening and closing.

       Stem thread, often rubbing against the stem nut, should be coated with a little yellow dry oil, molybdenum disulfide or graphite powder for lubrication.

       For valves that do not open and close often, you must turn the handwheel periodically to add lubricant to the stem threads to prevent seizure.

       For outdoor valves, protect the valve stem to prevent rain, snow, dust and rust.

       If the valve is to be mechanically operated, lubricate the gearbox on time.

       Always keep the valve clean.

       Always check and maintain the integrity of other parts of the valve. If the fixing nut of the handwheel falls off, it must be matched and cannot be used together, otherwise the four sides of the upper part of the valve stem will be ground, gradually losing the reliability of cooperation, and even unable to start.

       Do not rely on the valve to support other heavy objects, and do not stand on the valve.

       The valve stem, especially the threaded part, should be wiped frequently, and the lubricant that has been contaminated by dust must be replaced with a new one, because the dust contains hard impurities, which easily wears the threads and the surface of the valve stem, affecting the service life.